License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.
By default all files without license information are under the default
license of the kernel, which is GPL version 2.
Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.
How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,
Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.
The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.
The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.
Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if <5
lines).
All documentation files were explicitly excluded.
The following heuristics were used to determine which SPDX license
identifiers to apply.
- when both scanners couldn't find any license traces, file was
considered to have no license information in it, and the top level
COPYING file license applied.
For non */uapi/* files that summary was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 11139
and resulted in the first patch in this series.
If that file was a */uapi/* path one, it was "GPL-2.0 WITH
Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 WITH Linux-syscall-note 930
and resulted in the second patch in this series.
- if a file had some form of licensing information in it, and was one
of the */uapi/* ones, it was denoted with the Linux-syscall-note if
any GPL family license was found in the file or had no licensing in
it (per prior point). Results summary:
SPDX license identifier # files
---------------------------------------------------|------
GPL-2.0 WITH Linux-syscall-note 270
GPL-2.0+ WITH Linux-syscall-note 169
((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21
((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17
LGPL-2.1+ WITH Linux-syscall-note 15
GPL-1.0+ WITH Linux-syscall-note 14
((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5
LGPL-2.0+ WITH Linux-syscall-note 4
LGPL-2.1 WITH Linux-syscall-note 3
((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3
((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1
and that resulted in the third patch in this series.
- when the two scanners agreed on the detected license(s), that became
the concluded license(s).
- when there was disagreement between the two scanners (one detected a
license but the other didn't, or they both detected different
licenses) a manual inspection of the file occurred.
- In most cases a manual inspection of the information in the file
resulted in a clear resolution of the license that should apply (and
which scanner probably needed to revisit its heuristics).
- When it was not immediately clear, the license identifier was
confirmed with lawyers working with the Linux Foundation.
- If there was any question as to the appropriate license identifier,
the file was flagged for further research and to be revisited later
in time.
In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.
Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights. The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.
Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.
In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.
Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
- a full scancode scan run, collecting the matched texts, detected
license ids and scores
- reviewing anything where there was a license detected (about 500+
files) to ensure that the applied SPDX license was correct
- reviewing anything where there was no detection but the patch license
was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
SPDX license was correct
This produced a worksheet with 20 files needing minor correction. This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.
These .csv files were then reviewed by Greg. Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected. This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.) Finally Greg ran the script using the .csv files to
generate the patches.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 22:07:57 +08:00
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/* SPDX-License-Identifier: GPL-2.0 */
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2005-04-17 06:20:36 +08:00
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#ifndef __LINUX_SMP_H
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#define __LINUX_SMP_H
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/*
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* Generic SMP support
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* Alan Cox. <alan@redhat.com>
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*/
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2007-05-17 13:11:09 +08:00
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#include <linux/errno.h>
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2008-09-24 13:15:57 +08:00
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#include <linux/types.h>
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2008-06-26 17:21:34 +08:00
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#include <linux/list.h>
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#include <linux/cpumask.h>
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smp: add missing init.h include
Commit 34db18a054c6 ("smp: move smp setup functions to kernel/smp.c")
causes this build error on s390 because of a missing init.h include:
CC arch/s390/kernel/asm-offsets.s
In file included from /home2/heicarst/linux-2.6/arch/s390/include/asm/spinlock.h:14:0,
from include/linux/spinlock.h:87,
from include/linux/seqlock.h:29,
from include/linux/time.h:8,
from include/linux/timex.h:56,
from include/linux/sched.h:57,
from arch/s390/kernel/asm-offsets.c:10:
include/linux/smp.h:117:20: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'setup_nr_cpu_ids'
include/linux/smp.h:118:20: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'smp_init'
Fix it by adding the include statement.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: WANG Cong <amwang@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-03-23 15:24:58 +08:00
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#include <linux/init.h>
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2014-01-31 07:45:47 +08:00
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#include <linux/llist.h>
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2005-04-17 06:20:36 +08:00
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2010-10-28 00:28:36 +08:00
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typedef void (*smp_call_func_t)(void *info);
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2020-01-17 17:01:35 +08:00
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typedef bool (*smp_cond_func_t)(int cpu, void *info);
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2020-05-27 00:11:02 +08:00
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enum {
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CSD_FLAG_LOCK = 0x01,
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/* IRQ_WORK_flags */
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CSD_TYPE_ASYNC = 0x00,
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CSD_TYPE_SYNC = 0x10,
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CSD_TYPE_IRQ_WORK = 0x20,
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2020-05-27 00:11:04 +08:00
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CSD_TYPE_TTWU = 0x30,
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2020-05-27 00:11:02 +08:00
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CSD_FLAG_TYPE_MASK = 0xF0,
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};
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/*
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* structure shares (partial) layout with struct irq_work
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*/
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smp: Avoid using two cache lines for struct call_single_data
struct call_single_data is used in IPIs to transfer information between
CPUs. Its size is bigger than sizeof(unsigned long) and less than
cache line size. Currently it is not allocated with any explicit alignment
requirements. This makes it possible for allocated call_single_data to
cross two cache lines, which results in double the number of the cache lines
that need to be transferred among CPUs.
This can be fixed by requiring call_single_data to be aligned with the
size of call_single_data. Currently the size of call_single_data is the
power of 2. If we add new fields to call_single_data, we may need to
add padding to make sure the size of new definition is the power of 2
as well.
Fortunately, this is enforced by GCC, which will report bad sizes.
To set alignment requirements of call_single_data to the size of
call_single_data, a struct definition and a typedef is used.
To test the effect of the patch, I used the vm-scalability multiple
thread swap test case (swap-w-seq-mt). The test will create multiple
threads and each thread will eat memory until all RAM and part of swap
is used, so that huge number of IPIs are triggered when unmapping
memory. In the test, the throughput of memory writing improves ~5%
compared with misaligned call_single_data, because of faster IPIs.
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Huang, Ying <ying.huang@intel.com>
[ Add call_single_data_t and align with size of call_single_data. ]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Aaron Lu <aaron.lu@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/87bmnqd6lz.fsf@yhuang-mobile.sh.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-08-08 12:30:00 +08:00
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struct __call_single_data {
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2014-02-24 23:39:56 +08:00
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struct llist_node llist;
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2020-05-27 00:11:02 +08:00
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unsigned int flags;
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2010-10-28 00:28:36 +08:00
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smp_call_func_t func;
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2008-06-26 17:21:34 +08:00
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void *info;
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};
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smp: Avoid using two cache lines for struct call_single_data
struct call_single_data is used in IPIs to transfer information between
CPUs. Its size is bigger than sizeof(unsigned long) and less than
cache line size. Currently it is not allocated with any explicit alignment
requirements. This makes it possible for allocated call_single_data to
cross two cache lines, which results in double the number of the cache lines
that need to be transferred among CPUs.
This can be fixed by requiring call_single_data to be aligned with the
size of call_single_data. Currently the size of call_single_data is the
power of 2. If we add new fields to call_single_data, we may need to
add padding to make sure the size of new definition is the power of 2
as well.
Fortunately, this is enforced by GCC, which will report bad sizes.
To set alignment requirements of call_single_data to the size of
call_single_data, a struct definition and a typedef is used.
To test the effect of the patch, I used the vm-scalability multiple
thread swap test case (swap-w-seq-mt). The test will create multiple
threads and each thread will eat memory until all RAM and part of swap
is used, so that huge number of IPIs are triggered when unmapping
memory. In the test, the throughput of memory writing improves ~5%
compared with misaligned call_single_data, because of faster IPIs.
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Huang, Ying <ying.huang@intel.com>
[ Add call_single_data_t and align with size of call_single_data. ]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Aaron Lu <aaron.lu@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/87bmnqd6lz.fsf@yhuang-mobile.sh.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-08-08 12:30:00 +08:00
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/* Use __aligned() to avoid to use 2 cache lines for 1 csd */
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typedef struct __call_single_data call_single_data_t
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__aligned(sizeof(struct __call_single_data));
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2020-05-27 00:11:02 +08:00
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/*
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* Enqueue a llist_node on the call_single_queue; be very careful, read
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* flush_smp_call_function_queue() in detail.
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*/
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extern void __smp_call_single_queue(int cpu, struct llist_node *node);
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2008-12-16 12:26:48 +08:00
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/* total number of cpus in this system (may exceed NR_CPUS) */
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extern unsigned int total_cpus;
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2010-10-28 00:28:36 +08:00
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int smp_call_function_single(int cpuid, smp_call_func_t func, void *info,
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int wait);
|
2009-01-10 04:27:08 +08:00
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2013-09-12 05:23:26 +08:00
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/*
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* Call a function on all processors
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*/
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2019-06-13 14:48:05 +08:00
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void on_each_cpu(smp_call_func_t func, void *info, int wait);
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2013-09-12 05:23:26 +08:00
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2013-09-12 05:23:24 +08:00
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/*
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* Call a function on processors specified by mask, which might include
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* the local one.
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*/
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void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func,
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void *info, bool wait);
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/*
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* Call a function on each processor for which the supplied function
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* cond_func returns a positive value. This may include the local
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* processor.
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*/
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2020-01-17 17:01:35 +08:00
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void on_each_cpu_cond(smp_cond_func_t cond_func, smp_call_func_t func,
|
2020-01-17 17:01:37 +08:00
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void *info, bool wait);
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2013-09-12 05:23:24 +08:00
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2020-01-17 17:01:35 +08:00
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void on_each_cpu_cond_mask(smp_cond_func_t cond_func, smp_call_func_t func,
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2020-01-17 17:01:37 +08:00
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void *info, bool wait, const struct cpumask *mask);
|
2018-09-26 11:58:41 +08:00
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|
smp: Avoid using two cache lines for struct call_single_data
struct call_single_data is used in IPIs to transfer information between
CPUs. Its size is bigger than sizeof(unsigned long) and less than
cache line size. Currently it is not allocated with any explicit alignment
requirements. This makes it possible for allocated call_single_data to
cross two cache lines, which results in double the number of the cache lines
that need to be transferred among CPUs.
This can be fixed by requiring call_single_data to be aligned with the
size of call_single_data. Currently the size of call_single_data is the
power of 2. If we add new fields to call_single_data, we may need to
add padding to make sure the size of new definition is the power of 2
as well.
Fortunately, this is enforced by GCC, which will report bad sizes.
To set alignment requirements of call_single_data to the size of
call_single_data, a struct definition and a typedef is used.
To test the effect of the patch, I used the vm-scalability multiple
thread swap test case (swap-w-seq-mt). The test will create multiple
threads and each thread will eat memory until all RAM and part of swap
is used, so that huge number of IPIs are triggered when unmapping
memory. In the test, the throughput of memory writing improves ~5%
compared with misaligned call_single_data, because of faster IPIs.
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Huang, Ying <ying.huang@intel.com>
[ Add call_single_data_t and align with size of call_single_data. ]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Aaron Lu <aaron.lu@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/87bmnqd6lz.fsf@yhuang-mobile.sh.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-08-08 12:30:00 +08:00
|
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int smp_call_function_single_async(int cpu, call_single_data_t *csd);
|
2013-11-15 06:32:09 +08:00
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2005-04-17 06:20:36 +08:00
|
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#ifdef CONFIG_SMP
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#include <linux/preempt.h>
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#include <linux/kernel.h>
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#include <linux/compiler.h>
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#include <linux/thread_info.h>
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#include <asm/smp.h>
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/*
|
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* main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
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* (defined in asm header):
|
2009-03-13 18:14:06 +08:00
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*/
|
2005-04-17 06:20:36 +08:00
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/*
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* stops all CPUs but the current one:
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*/
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extern void smp_send_stop(void);
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/*
|
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* sends a 'reschedule' event to another CPU:
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*/
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extern void smp_send_reschedule(int cpu);
|
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|
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/*
|
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* Prepare machine for booting other CPUs.
|
|
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*/
|
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extern void smp_prepare_cpus(unsigned int max_cpus);
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/*
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* Bring a CPU up
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*/
|
2012-04-20 21:05:42 +08:00
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extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle);
|
2005-04-17 06:20:36 +08:00
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/*
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* Final polishing of CPUs
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*/
|
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extern void smp_cpus_done(unsigned int max_cpus);
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/*
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* Call a function on all other processors
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*/
|
2019-06-13 14:48:05 +08:00
|
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void smp_call_function(smp_call_func_t func, void *info, int wait);
|
2008-12-30 06:35:16 +08:00
|
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void smp_call_function_many(const struct cpumask *mask,
|
2010-10-28 00:28:36 +08:00
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smp_call_func_t func, void *info, bool wait);
|
2008-11-05 10:39:10 +08:00
|
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2009-11-18 06:27:27 +08:00
|
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int smp_call_function_any(const struct cpumask *mask,
|
2010-10-28 00:28:36 +08:00
|
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smp_call_func_t func, void *info, int wait);
|
2009-11-18 06:27:27 +08:00
|
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|
2012-05-08 01:59:48 +08:00
|
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void kick_all_cpus_sync(void);
|
2014-09-04 15:17:54 +08:00
|
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void wake_up_all_idle_cpus(void);
|
2012-05-08 01:59:48 +08:00
|
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|
2008-06-26 17:21:34 +08:00
|
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/*
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* Generic and arch helpers
|
|
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*/
|
2011-03-30 00:35:04 +08:00
|
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void __init call_function_init(void);
|
2008-06-26 17:21:34 +08:00
|
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|
void generic_smp_call_function_single_interrupt(void);
|
smp: make smp_call_function_many() use logic similar to smp_call_function_single()
I'm testing swapout workload in a two-socket Xeon machine. The workload
has 10 threads, each thread sequentially accesses separate memory
region. TLB flush overhead is very big in the workload. For each page,
page reclaim need move it from active lru list and then unmap it. Both
need a TLB flush. And this is a multthread workload, TLB flush happens
in 10 CPUs. In X86, TLB flush uses generic smp_call)function. So this
workload stress smp_call_function_many heavily.
Without patch, perf shows:
+ 24.49% [k] generic_smp_call_function_interrupt
- 21.72% [k] _raw_spin_lock
- _raw_spin_lock
+ 79.80% __page_check_address
+ 6.42% generic_smp_call_function_interrupt
+ 3.31% get_swap_page
+ 2.37% free_pcppages_bulk
+ 1.75% handle_pte_fault
+ 1.54% put_super
+ 1.41% grab_super_passive
+ 1.36% __swap_duplicate
+ 0.68% blk_flush_plug_list
+ 0.62% swap_info_get
+ 6.55% [k] flush_tlb_func
+ 6.46% [k] smp_call_function_many
+ 5.09% [k] call_function_interrupt
+ 4.75% [k] default_send_IPI_mask_sequence_phys
+ 2.18% [k] find_next_bit
swapout throughput is around 1300M/s.
With the patch, perf shows:
- 27.23% [k] _raw_spin_lock
- _raw_spin_lock
+ 80.53% __page_check_address
+ 8.39% generic_smp_call_function_single_interrupt
+ 2.44% get_swap_page
+ 1.76% free_pcppages_bulk
+ 1.40% handle_pte_fault
+ 1.15% __swap_duplicate
+ 1.05% put_super
+ 0.98% grab_super_passive
+ 0.86% blk_flush_plug_list
+ 0.57% swap_info_get
+ 8.25% [k] default_send_IPI_mask_sequence_phys
+ 7.55% [k] call_function_interrupt
+ 7.47% [k] smp_call_function_many
+ 7.25% [k] flush_tlb_func
+ 3.81% [k] _raw_spin_lock_irqsave
+ 3.78% [k] generic_smp_call_function_single_interrupt
swapout throughput is around 1400M/s. So there is around a 7%
improvement, and total cpu utilization doesn't change.
Without the patch, cfd_data is shared by all CPUs.
generic_smp_call_function_interrupt does read/write cfd_data several times
which will create a lot of cache ping-pong. With the patch, the data
becomes per-cpu. The ping-pong is avoided. And from the perf data, this
doesn't make call_single_queue lock contend.
Next step is to remove generic_smp_call_function_interrupt() from arch
code.
Signed-off-by: Shaohua Li <shli@fusionio.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-22 08:43:03 +08:00
|
|
|
#define generic_smp_call_function_interrupt \
|
|
|
|
generic_smp_call_function_single_interrupt
|
2006-09-26 14:32:33 +08:00
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/*
|
|
|
|
* Mark the boot cpu "online" so that it can call console drivers in
|
|
|
|
* printk() and can access its per-cpu storage.
|
|
|
|
*/
|
|
|
|
void smp_prepare_boot_cpu(void);
|
|
|
|
|
2008-01-30 20:33:17 +08:00
|
|
|
extern unsigned int setup_max_cpus;
|
2011-03-23 07:34:06 +08:00
|
|
|
extern void __init setup_nr_cpu_ids(void);
|
|
|
|
extern void __init smp_init(void);
|
2008-01-30 20:33:17 +08:00
|
|
|
|
2017-03-20 19:26:55 +08:00
|
|
|
extern int __boot_cpu_id;
|
|
|
|
|
|
|
|
static inline int get_boot_cpu_id(void)
|
|
|
|
{
|
|
|
|
return __boot_cpu_id;
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
#else /* !SMP */
|
|
|
|
|
2009-03-13 18:14:06 +08:00
|
|
|
static inline void smp_send_stop(void) { }
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/*
|
|
|
|
* These macros fold the SMP functionality into a single CPU system
|
|
|
|
*/
|
2005-06-22 08:14:34 +08:00
|
|
|
#define raw_smp_processor_id() 0
|
2019-06-13 14:48:05 +08:00
|
|
|
static inline void up_smp_call_function(smp_call_func_t func, void *info)
|
2006-03-26 17:37:19 +08:00
|
|
|
{
|
|
|
|
}
|
2008-06-06 17:18:06 +08:00
|
|
|
#define smp_call_function(func, info, wait) \
|
2007-11-10 05:39:38 +08:00
|
|
|
(up_smp_call_function(func, info))
|
2013-09-12 05:19:37 +08:00
|
|
|
|
2005-07-28 16:07:41 +08:00
|
|
|
static inline void smp_send_reschedule(int cpu) { }
|
2005-07-29 01:34:47 +08:00
|
|
|
#define smp_prepare_boot_cpu() do {} while (0)
|
2008-12-15 16:34:35 +08:00
|
|
|
#define smp_call_function_many(mask, func, info, wait) \
|
|
|
|
(up_smp_call_function(func, info))
|
2011-03-30 00:35:04 +08:00
|
|
|
static inline void call_function_init(void) { }
|
2009-11-18 06:27:27 +08:00
|
|
|
|
|
|
|
static inline int
|
2010-10-28 00:28:36 +08:00
|
|
|
smp_call_function_any(const struct cpumask *mask, smp_call_func_t func,
|
2009-11-18 06:27:27 +08:00
|
|
|
void *info, int wait)
|
2008-06-26 17:21:34 +08:00
|
|
|
{
|
2009-11-18 06:27:27 +08:00
|
|
|
return smp_call_function_single(0, func, info, wait);
|
2008-06-26 17:21:34 +08:00
|
|
|
}
|
2009-11-18 06:27:27 +08:00
|
|
|
|
2012-05-08 01:59:48 +08:00
|
|
|
static inline void kick_all_cpus_sync(void) { }
|
2014-09-04 15:17:54 +08:00
|
|
|
static inline void wake_up_all_idle_cpus(void) { }
|
2012-05-08 01:59:48 +08:00
|
|
|
|
2015-01-16 05:22:39 +08:00
|
|
|
#ifdef CONFIG_UP_LATE_INIT
|
|
|
|
extern void __init up_late_init(void);
|
|
|
|
static inline void smp_init(void) { up_late_init(); }
|
|
|
|
#else
|
|
|
|
static inline void smp_init(void) { }
|
|
|
|
#endif
|
|
|
|
|
2017-03-20 19:26:55 +08:00
|
|
|
static inline int get_boot_cpu_id(void)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
#endif /* !SMP */
|
|
|
|
|
x86/percpu: Relax smp_processor_id()
Nadav reported that since this_cpu_read() became asm-volatile, many
smp_processor_id() users generated worse code due to the extra
constraints.
However since smp_processor_id() is reading a stable value, we can use
__this_cpu_read().
While this does reduce text size somewhat, this mostly results in code
movement to .text.unlikely as a result of more/larger .cold.
subfunctions. Less text on the hotpath is good for I$.
$ ./compare.sh defconfig-build1 defconfig-build2 vmlinux.o
setup_APIC_ibs 90 98 -12,+20
force_ibs_eilvt_setup 400 413 -57,+70
pci_serr_error 109 104 -54,+49
pci_serr_error 109 104 -54,+49
unknown_nmi_error 125 120 -76,+71
unknown_nmi_error 125 120 -76,+71
io_check_error 125 132 -97,+104
intel_thermal_interrupt 730 822 +92,+0
intel_init_thermal 951 945 -6,+0
generic_get_mtrr 301 294 -7,+0
generic_get_mtrr 301 294 -7,+0
generic_set_all 749 754 -44,+49
get_fixed_ranges 352 360 -41,+49
x86_acpi_suspend_lowlevel 369 363 -6,+0
check_tsc_sync_source 412 412 -71,+71
irq_migrate_all_off_this_cpu 662 674 -14,+26
clocksource_watchdog 748 748 -113,+113
__perf_event_account_interrupt 204 197 -7,+0
attempt_merge 1748 1741 -7,+0
intel_guc_send_ct 1424 1409 -15,+0
__fini_doorbell 235 231 -4,+0
bdw_set_cdclk 928 923 -5,+0
gen11_dsi_disable 1571 1556 -15,+0
gmbus_wait 493 488 -5,+0
md_make_request 376 369 -7,+0
__split_and_process_bio 543 536 -7,+0
delay_tsc 96 89 -7,+0
hsw_disable_pc8 696 691 -5,+0
tsc_verify_tsc_adjust 215 228 -22,+35
cpuidle_driver_unref 56 49 -7,+0
blk_account_io_completion 159 148 -11,+0
mtrr_wrmsr 95 99 -29,+33
__intel_wait_for_register_fw 401 419 +18,+0
cpuidle_driver_ref 43 36 -7,+0
cpuidle_get_driver 15 8 -7,+0
blk_account_io_done 535 528 -7,+0
irq_migrate_all_off_this_cpu 662 674 -14,+26
check_tsc_sync_source 412 412 -71,+71
irq_wait_for_poll 170 163 -7,+0
generic_end_io_acct 329 322 -7,+0
x86_acpi_suspend_lowlevel 369 363 -6,+0
nohz_balance_enter_idle 198 191 -7,+0
generic_start_io_acct 254 247 -7,+0
blk_account_io_start 341 334 -7,+0
perf_event_task_tick 682 675 -7,+0
intel_init_thermal 951 945 -6,+0
amd_e400_c1e_apic_setup 47 51 -28,+32
setup_APIC_eilvt 350 328 -22,+0
hsw_enable_pc8 1611 1605 -6,+0
total 12985947 12985892 -994,+939
Reported-by: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-02-27 16:48:51 +08:00
|
|
|
/**
|
|
|
|
* raw_processor_id() - get the current (unstable) CPU id
|
|
|
|
*
|
|
|
|
* For then you know what you are doing and need an unstable
|
|
|
|
* CPU id.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/**
|
|
|
|
* smp_processor_id() - get the current (stable) CPU id
|
|
|
|
*
|
|
|
|
* This is the normal accessor to the CPU id and should be used
|
|
|
|
* whenever possible.
|
|
|
|
*
|
|
|
|
* The CPU id is stable when:
|
2005-04-17 06:20:36 +08:00
|
|
|
*
|
x86/percpu: Relax smp_processor_id()
Nadav reported that since this_cpu_read() became asm-volatile, many
smp_processor_id() users generated worse code due to the extra
constraints.
However since smp_processor_id() is reading a stable value, we can use
__this_cpu_read().
While this does reduce text size somewhat, this mostly results in code
movement to .text.unlikely as a result of more/larger .cold.
subfunctions. Less text on the hotpath is good for I$.
$ ./compare.sh defconfig-build1 defconfig-build2 vmlinux.o
setup_APIC_ibs 90 98 -12,+20
force_ibs_eilvt_setup 400 413 -57,+70
pci_serr_error 109 104 -54,+49
pci_serr_error 109 104 -54,+49
unknown_nmi_error 125 120 -76,+71
unknown_nmi_error 125 120 -76,+71
io_check_error 125 132 -97,+104
intel_thermal_interrupt 730 822 +92,+0
intel_init_thermal 951 945 -6,+0
generic_get_mtrr 301 294 -7,+0
generic_get_mtrr 301 294 -7,+0
generic_set_all 749 754 -44,+49
get_fixed_ranges 352 360 -41,+49
x86_acpi_suspend_lowlevel 369 363 -6,+0
check_tsc_sync_source 412 412 -71,+71
irq_migrate_all_off_this_cpu 662 674 -14,+26
clocksource_watchdog 748 748 -113,+113
__perf_event_account_interrupt 204 197 -7,+0
attempt_merge 1748 1741 -7,+0
intel_guc_send_ct 1424 1409 -15,+0
__fini_doorbell 235 231 -4,+0
bdw_set_cdclk 928 923 -5,+0
gen11_dsi_disable 1571 1556 -15,+0
gmbus_wait 493 488 -5,+0
md_make_request 376 369 -7,+0
__split_and_process_bio 543 536 -7,+0
delay_tsc 96 89 -7,+0
hsw_disable_pc8 696 691 -5,+0
tsc_verify_tsc_adjust 215 228 -22,+35
cpuidle_driver_unref 56 49 -7,+0
blk_account_io_completion 159 148 -11,+0
mtrr_wrmsr 95 99 -29,+33
__intel_wait_for_register_fw 401 419 +18,+0
cpuidle_driver_ref 43 36 -7,+0
cpuidle_get_driver 15 8 -7,+0
blk_account_io_done 535 528 -7,+0
irq_migrate_all_off_this_cpu 662 674 -14,+26
check_tsc_sync_source 412 412 -71,+71
irq_wait_for_poll 170 163 -7,+0
generic_end_io_acct 329 322 -7,+0
x86_acpi_suspend_lowlevel 369 363 -6,+0
nohz_balance_enter_idle 198 191 -7,+0
generic_start_io_acct 254 247 -7,+0
blk_account_io_start 341 334 -7,+0
perf_event_task_tick 682 675 -7,+0
intel_init_thermal 951 945 -6,+0
amd_e400_c1e_apic_setup 47 51 -28,+32
setup_APIC_eilvt 350 328 -22,+0
hsw_enable_pc8 1611 1605 -6,+0
total 12985947 12985892 -994,+939
Reported-by: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-02-27 16:48:51 +08:00
|
|
|
* - IRQs are disabled;
|
|
|
|
* - preemption is disabled;
|
|
|
|
* - the task is CPU affine.
|
2005-04-17 06:20:36 +08:00
|
|
|
*
|
x86/percpu: Relax smp_processor_id()
Nadav reported that since this_cpu_read() became asm-volatile, many
smp_processor_id() users generated worse code due to the extra
constraints.
However since smp_processor_id() is reading a stable value, we can use
__this_cpu_read().
While this does reduce text size somewhat, this mostly results in code
movement to .text.unlikely as a result of more/larger .cold.
subfunctions. Less text on the hotpath is good for I$.
$ ./compare.sh defconfig-build1 defconfig-build2 vmlinux.o
setup_APIC_ibs 90 98 -12,+20
force_ibs_eilvt_setup 400 413 -57,+70
pci_serr_error 109 104 -54,+49
pci_serr_error 109 104 -54,+49
unknown_nmi_error 125 120 -76,+71
unknown_nmi_error 125 120 -76,+71
io_check_error 125 132 -97,+104
intel_thermal_interrupt 730 822 +92,+0
intel_init_thermal 951 945 -6,+0
generic_get_mtrr 301 294 -7,+0
generic_get_mtrr 301 294 -7,+0
generic_set_all 749 754 -44,+49
get_fixed_ranges 352 360 -41,+49
x86_acpi_suspend_lowlevel 369 363 -6,+0
check_tsc_sync_source 412 412 -71,+71
irq_migrate_all_off_this_cpu 662 674 -14,+26
clocksource_watchdog 748 748 -113,+113
__perf_event_account_interrupt 204 197 -7,+0
attempt_merge 1748 1741 -7,+0
intel_guc_send_ct 1424 1409 -15,+0
__fini_doorbell 235 231 -4,+0
bdw_set_cdclk 928 923 -5,+0
gen11_dsi_disable 1571 1556 -15,+0
gmbus_wait 493 488 -5,+0
md_make_request 376 369 -7,+0
__split_and_process_bio 543 536 -7,+0
delay_tsc 96 89 -7,+0
hsw_disable_pc8 696 691 -5,+0
tsc_verify_tsc_adjust 215 228 -22,+35
cpuidle_driver_unref 56 49 -7,+0
blk_account_io_completion 159 148 -11,+0
mtrr_wrmsr 95 99 -29,+33
__intel_wait_for_register_fw 401 419 +18,+0
cpuidle_driver_ref 43 36 -7,+0
cpuidle_get_driver 15 8 -7,+0
blk_account_io_done 535 528 -7,+0
irq_migrate_all_off_this_cpu 662 674 -14,+26
check_tsc_sync_source 412 412 -71,+71
irq_wait_for_poll 170 163 -7,+0
generic_end_io_acct 329 322 -7,+0
x86_acpi_suspend_lowlevel 369 363 -6,+0
nohz_balance_enter_idle 198 191 -7,+0
generic_start_io_acct 254 247 -7,+0
blk_account_io_start 341 334 -7,+0
perf_event_task_tick 682 675 -7,+0
intel_init_thermal 951 945 -6,+0
amd_e400_c1e_apic_setup 47 51 -28,+32
setup_APIC_eilvt 350 328 -22,+0
hsw_enable_pc8 1611 1605 -6,+0
total 12985947 12985892 -994,+939
Reported-by: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-02-27 16:48:51 +08:00
|
|
|
* When CONFIG_DEBUG_PREEMPT; we verify these assumption and WARN
|
|
|
|
* when smp_processor_id() is used when the CPU id is not stable.
|
2005-04-17 06:20:36 +08:00
|
|
|
*/
|
x86/percpu: Relax smp_processor_id()
Nadav reported that since this_cpu_read() became asm-volatile, many
smp_processor_id() users generated worse code due to the extra
constraints.
However since smp_processor_id() is reading a stable value, we can use
__this_cpu_read().
While this does reduce text size somewhat, this mostly results in code
movement to .text.unlikely as a result of more/larger .cold.
subfunctions. Less text on the hotpath is good for I$.
$ ./compare.sh defconfig-build1 defconfig-build2 vmlinux.o
setup_APIC_ibs 90 98 -12,+20
force_ibs_eilvt_setup 400 413 -57,+70
pci_serr_error 109 104 -54,+49
pci_serr_error 109 104 -54,+49
unknown_nmi_error 125 120 -76,+71
unknown_nmi_error 125 120 -76,+71
io_check_error 125 132 -97,+104
intel_thermal_interrupt 730 822 +92,+0
intel_init_thermal 951 945 -6,+0
generic_get_mtrr 301 294 -7,+0
generic_get_mtrr 301 294 -7,+0
generic_set_all 749 754 -44,+49
get_fixed_ranges 352 360 -41,+49
x86_acpi_suspend_lowlevel 369 363 -6,+0
check_tsc_sync_source 412 412 -71,+71
irq_migrate_all_off_this_cpu 662 674 -14,+26
clocksource_watchdog 748 748 -113,+113
__perf_event_account_interrupt 204 197 -7,+0
attempt_merge 1748 1741 -7,+0
intel_guc_send_ct 1424 1409 -15,+0
__fini_doorbell 235 231 -4,+0
bdw_set_cdclk 928 923 -5,+0
gen11_dsi_disable 1571 1556 -15,+0
gmbus_wait 493 488 -5,+0
md_make_request 376 369 -7,+0
__split_and_process_bio 543 536 -7,+0
delay_tsc 96 89 -7,+0
hsw_disable_pc8 696 691 -5,+0
tsc_verify_tsc_adjust 215 228 -22,+35
cpuidle_driver_unref 56 49 -7,+0
blk_account_io_completion 159 148 -11,+0
mtrr_wrmsr 95 99 -29,+33
__intel_wait_for_register_fw 401 419 +18,+0
cpuidle_driver_ref 43 36 -7,+0
cpuidle_get_driver 15 8 -7,+0
blk_account_io_done 535 528 -7,+0
irq_migrate_all_off_this_cpu 662 674 -14,+26
check_tsc_sync_source 412 412 -71,+71
irq_wait_for_poll 170 163 -7,+0
generic_end_io_acct 329 322 -7,+0
x86_acpi_suspend_lowlevel 369 363 -6,+0
nohz_balance_enter_idle 198 191 -7,+0
generic_start_io_acct 254 247 -7,+0
blk_account_io_start 341 334 -7,+0
perf_event_task_tick 682 675 -7,+0
intel_init_thermal 951 945 -6,+0
amd_e400_c1e_apic_setup 47 51 -28,+32
setup_APIC_eilvt 350 328 -22,+0
hsw_enable_pc8 1611 1605 -6,+0
total 12985947 12985892 -994,+939
Reported-by: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-02-27 16:48:51 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Allow the architecture to differentiate between a stable and unstable read.
|
|
|
|
* For example, x86 uses an IRQ-safe asm-volatile read for the unstable but a
|
|
|
|
* regular asm read for the stable.
|
|
|
|
*/
|
|
|
|
#ifndef __smp_processor_id
|
|
|
|
#define __smp_processor_id(x) raw_smp_processor_id(x)
|
|
|
|
#endif
|
|
|
|
|
2005-06-22 08:14:34 +08:00
|
|
|
#ifdef CONFIG_DEBUG_PREEMPT
|
|
|
|
extern unsigned int debug_smp_processor_id(void);
|
|
|
|
# define smp_processor_id() debug_smp_processor_id()
|
2005-04-17 06:20:36 +08:00
|
|
|
#else
|
x86/percpu: Relax smp_processor_id()
Nadav reported that since this_cpu_read() became asm-volatile, many
smp_processor_id() users generated worse code due to the extra
constraints.
However since smp_processor_id() is reading a stable value, we can use
__this_cpu_read().
While this does reduce text size somewhat, this mostly results in code
movement to .text.unlikely as a result of more/larger .cold.
subfunctions. Less text on the hotpath is good for I$.
$ ./compare.sh defconfig-build1 defconfig-build2 vmlinux.o
setup_APIC_ibs 90 98 -12,+20
force_ibs_eilvt_setup 400 413 -57,+70
pci_serr_error 109 104 -54,+49
pci_serr_error 109 104 -54,+49
unknown_nmi_error 125 120 -76,+71
unknown_nmi_error 125 120 -76,+71
io_check_error 125 132 -97,+104
intel_thermal_interrupt 730 822 +92,+0
intel_init_thermal 951 945 -6,+0
generic_get_mtrr 301 294 -7,+0
generic_get_mtrr 301 294 -7,+0
generic_set_all 749 754 -44,+49
get_fixed_ranges 352 360 -41,+49
x86_acpi_suspend_lowlevel 369 363 -6,+0
check_tsc_sync_source 412 412 -71,+71
irq_migrate_all_off_this_cpu 662 674 -14,+26
clocksource_watchdog 748 748 -113,+113
__perf_event_account_interrupt 204 197 -7,+0
attempt_merge 1748 1741 -7,+0
intel_guc_send_ct 1424 1409 -15,+0
__fini_doorbell 235 231 -4,+0
bdw_set_cdclk 928 923 -5,+0
gen11_dsi_disable 1571 1556 -15,+0
gmbus_wait 493 488 -5,+0
md_make_request 376 369 -7,+0
__split_and_process_bio 543 536 -7,+0
delay_tsc 96 89 -7,+0
hsw_disable_pc8 696 691 -5,+0
tsc_verify_tsc_adjust 215 228 -22,+35
cpuidle_driver_unref 56 49 -7,+0
blk_account_io_completion 159 148 -11,+0
mtrr_wrmsr 95 99 -29,+33
__intel_wait_for_register_fw 401 419 +18,+0
cpuidle_driver_ref 43 36 -7,+0
cpuidle_get_driver 15 8 -7,+0
blk_account_io_done 535 528 -7,+0
irq_migrate_all_off_this_cpu 662 674 -14,+26
check_tsc_sync_source 412 412 -71,+71
irq_wait_for_poll 170 163 -7,+0
generic_end_io_acct 329 322 -7,+0
x86_acpi_suspend_lowlevel 369 363 -6,+0
nohz_balance_enter_idle 198 191 -7,+0
generic_start_io_acct 254 247 -7,+0
blk_account_io_start 341 334 -7,+0
perf_event_task_tick 682 675 -7,+0
intel_init_thermal 951 945 -6,+0
amd_e400_c1e_apic_setup 47 51 -28,+32
setup_APIC_eilvt 350 328 -22,+0
hsw_enable_pc8 1611 1605 -6,+0
total 12985947 12985892 -994,+939
Reported-by: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-02-27 16:48:51 +08:00
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# define smp_processor_id() __smp_processor_id()
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2005-04-17 06:20:36 +08:00
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#endif
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x86/percpu: Relax smp_processor_id()
Nadav reported that since this_cpu_read() became asm-volatile, many
smp_processor_id() users generated worse code due to the extra
constraints.
However since smp_processor_id() is reading a stable value, we can use
__this_cpu_read().
While this does reduce text size somewhat, this mostly results in code
movement to .text.unlikely as a result of more/larger .cold.
subfunctions. Less text on the hotpath is good for I$.
$ ./compare.sh defconfig-build1 defconfig-build2 vmlinux.o
setup_APIC_ibs 90 98 -12,+20
force_ibs_eilvt_setup 400 413 -57,+70
pci_serr_error 109 104 -54,+49
pci_serr_error 109 104 -54,+49
unknown_nmi_error 125 120 -76,+71
unknown_nmi_error 125 120 -76,+71
io_check_error 125 132 -97,+104
intel_thermal_interrupt 730 822 +92,+0
intel_init_thermal 951 945 -6,+0
generic_get_mtrr 301 294 -7,+0
generic_get_mtrr 301 294 -7,+0
generic_set_all 749 754 -44,+49
get_fixed_ranges 352 360 -41,+49
x86_acpi_suspend_lowlevel 369 363 -6,+0
check_tsc_sync_source 412 412 -71,+71
irq_migrate_all_off_this_cpu 662 674 -14,+26
clocksource_watchdog 748 748 -113,+113
__perf_event_account_interrupt 204 197 -7,+0
attempt_merge 1748 1741 -7,+0
intel_guc_send_ct 1424 1409 -15,+0
__fini_doorbell 235 231 -4,+0
bdw_set_cdclk 928 923 -5,+0
gen11_dsi_disable 1571 1556 -15,+0
gmbus_wait 493 488 -5,+0
md_make_request 376 369 -7,+0
__split_and_process_bio 543 536 -7,+0
delay_tsc 96 89 -7,+0
hsw_disable_pc8 696 691 -5,+0
tsc_verify_tsc_adjust 215 228 -22,+35
cpuidle_driver_unref 56 49 -7,+0
blk_account_io_completion 159 148 -11,+0
mtrr_wrmsr 95 99 -29,+33
__intel_wait_for_register_fw 401 419 +18,+0
cpuidle_driver_ref 43 36 -7,+0
cpuidle_get_driver 15 8 -7,+0
blk_account_io_done 535 528 -7,+0
irq_migrate_all_off_this_cpu 662 674 -14,+26
check_tsc_sync_source 412 412 -71,+71
irq_wait_for_poll 170 163 -7,+0
generic_end_io_acct 329 322 -7,+0
x86_acpi_suspend_lowlevel 369 363 -6,+0
nohz_balance_enter_idle 198 191 -7,+0
generic_start_io_acct 254 247 -7,+0
blk_account_io_start 341 334 -7,+0
perf_event_task_tick 682 675 -7,+0
intel_init_thermal 951 945 -6,+0
amd_e400_c1e_apic_setup 47 51 -28,+32
setup_APIC_eilvt 350 328 -22,+0
hsw_enable_pc8 1611 1605 -6,+0
total 12985947 12985892 -994,+939
Reported-by: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-02-27 16:48:51 +08:00
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#define get_cpu() ({ preempt_disable(); __smp_processor_id(); })
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2005-04-17 06:20:36 +08:00
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#define put_cpu() preempt_enable()
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2009-01-31 21:09:06 +08:00
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/*
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* Callback to arch code if there's nosmp or maxcpus=0 on the
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* boot command line:
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*/
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extern void arch_disable_smp_support(void);
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2020-04-30 19:40:03 +08:00
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extern void arch_thaw_secondary_cpus_begin(void);
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extern void arch_thaw_secondary_cpus_end(void);
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2014-02-11 06:25:49 +08:00
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2006-06-30 16:55:50 +08:00
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void smp_setup_processor_id(void);
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2016-08-29 14:48:44 +08:00
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int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par,
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bool phys);
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2016-07-14 01:17:01 +08:00
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/* SMP core functions */
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int smpcfd_prepare_cpu(unsigned int cpu);
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int smpcfd_dead_cpu(unsigned int cpu);
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int smpcfd_dying_cpu(unsigned int cpu);
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2005-04-17 06:20:36 +08:00
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#endif /* __LINUX_SMP_H */
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