I still happen to believe that I$ miss costs are a major thing, but
sadly, -Os doesn't seem to be the solution. With or without it, gcc
will miss some obvious code size improvements, and with it enabled gcc
will sometimes make choices that aren't good even with high I$ miss
ratios.
For example, with -Os, gcc on x86 will turn a 20-byte constant memcpy
into a "rep movsl". While I sincerely hope that x86 CPU's will some day
do a good job at that, they certainly don't do it yet, and the cost is
higher than a L1 I$ miss would be.
Some day I hope we can re-enable this.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* 'viafb-next' of git://github.com/schandinat/linux-2.6: (24 commits)
viafb: Automatic OLPC XO-1.5 configuration
viafb: remove unused CEA mode
viafb: try to map less memory in case of failure
viafb: use write combining for video ram
viafb: add X server compatibility mode
viafb: reduce OLPC refresh a bit
viafb: fix OLPC XO 1.5 device connection
viafb: fix OLPC DCON refresh rate
viafb: delete clock and PLL initialization
viafb: replace custom return values
viafb: some small cleanup for global variables
viafb: gather common good, old VGA initialization in one place
viafb: add engine clock support
viafb: add VIA slapping capability
viafb: split clock and PLL code to an extra file
viafb: add primary/secondary clock on/off switches
viafb: add clock source selection and PLL power management support
viafb: prepare for PLL separation
viafb: call viafb_get_clk_value only in viafb_set_vclock
viafb: remove unused max_hres/vres
...
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/parisc-2.6:
[PARISC] wire up syncfs syscall
[PARISC] wire up the fhandle syscalls
[PARISC] wire up clock_adjtime syscall
[PARISC] wire up fanotify syscalls
[PARISC] prevent speculative re-read on cache flush
[PARISC] only make executable areas executable
[PARISC] fix pacache .size with new binutils
Fixes build errors on s390 and probably other archs as well:
In file included from net/ipv4/ip_forward.c:32:0:
include/net/udp.h: In function 'udp_csum_outgoing':
include/net/udp.h:141:2: error: implicit declaration of function 'prefetch'
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Fixes this build error on s390 and probably other archs as well:
fs/inode.c: In function 'new_inode':
fs/inode.c:894:2: error: implicit declaration of function 'spin_lock_prefetch'
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
[ Happens on architectures that don't define their own prefetch
functions in <asm/processor.h>, and instead rely on the default
ones in <linux/prefetch.h> - Linus]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6:
firewire: sbp2: parallelize login, reconnect, logout
firewire: sbp2: octlet AT payloads can be stack-allocated
firewire: sbp2: omit Scsi_Host lock from queuecommand
firewire: core: use non-reentrant workqueue with rescuer
firewire: optimize iso queueing by setting wake only after the last packet
firewire: octlet AT payloads can be stack-allocated
firewire: ohci: optimize find_branch_descriptor()
firewire: ohci: avoid separate DMA mapping for small AT payloads
firewire: ohci: do not start DMA contexts before link is enabled
This solves a serious VFS-level bug in nested_symlink (which was
rewritten from do_follow_link), and follows the order of depth tests
that existed before.
The bug triggers a BUG_ON in fs/namei.c:1381, when running racer with
symlink and rename ops.
Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>
Acked-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Commit c182f90bc1 ("SCTP: fix race
between sctp_bind_addr_free() and sctp_bind_addr_conflict()") and
commit 1231f0baa5 ("net,rcu: convert
call_rcu(sctp_local_addr_free) to kfree_rcu()"), happening in
different trees, introduced a build failure.
Simply make the SCTP race fix use kfree_rcu() too.
Signed-off-by: David S. Miller <davem@davemloft.net>
Use kfree_rcu() instead of call_rcu(), remove garp_cleanup_module()
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
commit c3968a857a
('ipv6: RTA_PREFSRC support for ipv6 route source address selection')
added support for ipv6 prefsrc as an alternative to ipv6 addrlabels,
but it did not work because the prefsrc entry was not copied.
Cc: Daniel Walter <sahne@0x90.at>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (45 commits)
crypto: caam - add support for sha512 variants of existing AEAD algorithms
crypto: caam - remove unused authkeylen from caam_ctx
crypto: caam - fix decryption shared vs. non-shared key setting
crypto: caam - platform_bus_type migration
crypto: aesni-intel - fix aesni build on i386
crypto: aesni-intel - Merge with fpu.ko
crypto: mv_cesa - make count_sgs() null-pointer proof
crypto: mv_cesa - copy remaining bytes to SRAM only when needed
crypto: mv_cesa - move digest state initialisation to a better place
crypto: mv_cesa - fill inner/outer IV fields only in HMAC case
crypto: mv_cesa - refactor copy_src_to_buf()
crypto: mv_cesa - no need to save digest state after the last chunk
crypto: mv_cesa - print a warning when registration of AES algos fail
crypto: mv_cesa - drop this call to mv_hash_final from mv_hash_finup
crypto: mv_cesa - the descriptor pointer register needs to be set just once
crypto: mv_cesa - use ablkcipher_request_cast instead of the manual container_of
crypto: caam - fix printk recursion for long error texts
crypto: caam - remove unused keylen from session context
hwrng: amd - enable AMD hw rnd driver for Maple PPC boards
hwrng: amd - manage resource allocation
...
As Ben Hutchings discovered [1], the patch for CVE-2011-1017 (buffer
overflow in ldm_frag_add) is not sufficient. The original patch in
commit c340b1d640 ("fs/partitions/ldm.c: fix oops caused by corrupted
partition table") does not consider that, for subsequent fragments,
previously allocated memory is used.
[1] http://lkml.org/lkml/2011/5/6/407
Reported-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Timo Warns <warns@pre-sense.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Commit 778dd893ae ("tmpfs: fix race between umount and swapoff")
forgot the new rules for strict atomic kmap nesting, causing
WARNING: at arch/x86/mm/highmem_32.c:81
from __kunmap_atomic(), then
BUG: unable to handle kernel paging request at fffb9000
from shmem_swp_set() when shmem_unuse_inode() is handling swapoff with
highmem in use. My disgrace again.
See
https://bugzilla.kernel.org/show_bug.cgi?id=35352
Reported-by: Witold Baryluk <baryluk@smp.if.uj.edu.pl>
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Commit 69e3cea8d5 ("powerpc/smp: Make start_secondary_resume
available to all CPU variants") introduced start_secondary_resume to
misc_32.S, however it uses a 64-bit instruction which is not valid on
32-bit platforms. Use 'stw' instead.
Reported-by: Richard Cochran <richardcochran@gmail.com>
Tested-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev:
libata: Power off empty ports
libata-pmp: add support for Thermaltake BlackX Duet esata drive dock
ATA: Don't powerdown Compaq Triflex IDE device on suspend
libata: Use Maximum Write Same Length to report discard size limit
drivers/ata/acard-ahci.c: fix enum warning
pata_at91: SMC settings calculation bugfixes, support for t6z and IORDY
libata-sff: prevent irq descriptions for dummy ports
pata_cm64x: fix boot crash on parisc
When building with:
CONFIG_64BIT=y
CONFIG_MIPS32_COMPAT=y
CONFIG_COMPAT=y
CONFIG_MIPS32_O32=y
CONFIG_MIPS32_N32=y
CONFIG_SYSVIPC is not set
(and implicitly: CONFIG_SYSVIPC_COMPAT is not set)
the final link fails with unresolved symbols for:
compat_sys_semctl, compat_sys_msgsnd, compat_sys_msgrcv,
compat_sys_shmctl, compat_sys_msgctl, compat_sys_semtimedop
The fix is to add cond_syscall declarations for all syscalls in
ipc/compat.c
Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6: (1446 commits)
macvlan: fix panic if lowerdev in a bond
tg3: Add braces around 5906 workaround.
tg3: Fix NETIF_F_LOOPBACK error
macvlan: remove one synchronize_rcu() call
networking: NET_CLS_ROUTE4 depends on INET
irda: Fix error propagation in ircomm_lmp_connect_response()
irda: Kill set but unused variable 'bytes' in irlan_check_command_param()
irda: Kill set but unused variable 'clen' in ircomm_connect_indication()
rxrpc: Fix set but unused variable 'usage' in rxrpc_get_transport()
be2net: Kill set but unused variable 'req' in lancer_fw_download()
irda: Kill set but unused vars 'saddr' and 'daddr' in irlan_provider_connect_indication()
atl1c: atl1c_resume() is only used when CONFIG_PM_SLEEP is defined.
rxrpc: Fix set but unused variable 'usage' in rxrpc_get_peer().
rxrpc: Kill set but unused variable 'local' in rxrpc_UDP_error_handler()
rxrpc: Kill set but unused variable 'sp' in rxrpc_process_connection()
rxrpc: Kill set but unused variable 'sp' in rxrpc_rotate_tx_window()
pkt_sched: Kill set but unused variable 'protocol' in tc_classify()
isdn: capi: Use pr_debug() instead of ifdefs.
tg3: Update version to 3.119
tg3: Apply rx_discards fix to 5719/5720
...
Fix up trivial conflicts in arch/x86/Kconfig and net/mac80211/agg-tx.c
as per Davem.
* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6:
[IA64] define "_sdata" symbol
pstore: Fix Kconfig dependencies for apei->pstore
pstore: fix potential logic issue in pstore read interface
pstore: fix pstore filesystem mount/remount issue
pstore: fix one type of return value in pstore
[IA64] fix build warning in arch/ia64/oprofile/backtrace.c
* 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
MAINTAINERS: Add drivers/clocksource to TIMEKEEPING
clockevents/source: Use u64 to make 32bit happy
* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6: (32 commits)
[CIFS] Fix to problem with getattr caused by invalidate simplification patch
[CIFS] Remove sparse warning
[CIFS] Update cifs to version 1.72
cifs: Change key name to cifs.idmap, misc. clean-up
cifs: Unconditionally copy mount options to superblock info
cifs: Use kstrndup for cifs_sb->mountdata
cifs: Simplify handling of submount options in cifs_mount.
cifs: cifs_parse_mount_options: do not tokenize mount options in-place
cifs: Add support for mounting Windows 2008 DFS shares
cifs: Extract DFS referral expansion logic to separate function
cifs: turn BCC into a static inlined function
cifs: keep BCC in little-endian format
cifs: fix some unused variable warnings in id_rb_search
CIFS: Simplify invalidate part (try #5)
CIFS: directio read/write cleanups
consistently use smb_buf_length as be32 for cifs (try 3)
cifs: Invoke id mapping functions (try #17 repost)
cifs: Add idmap key and related data structures and functions (try #17 repost)
CIFS: Add launder_page operation (try #3)
Introduce smb2 mounts as vers=2
...
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
extable, core_kernel_data(): Make sure all archs define _sdata
core_kernel_data(): Fix architectures that do not define _sdata
* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (110 commits)
[SCSI] qla2xxx: Refactor call to qla2xxx_read_sfp for thermal temperature.
[SCSI] qla2xxx: Unify the read/write sfp mailbox command routines.
[SCSI] qla2xxx: Clear complete initialization control block.
[SCSI] qla2xxx: Allow an override of the registered maximum LUN.
[SCSI] qla2xxx: Add host number in reset and quiescent message logs.
[SCSI] qla2xxx: Correctly read sfp single byte mailbox register.
[SCSI] qla2xxx: Add qla82xx_rom_unlock() function.
[SCSI] qla2xxx: Log if qla82xx firmware fails to load from flash.
[SCSI] qla2xxx: Use passed in host to initialize local scsi_qla_host in queuecommand function
[SCSI] qla2xxx: Correct buffer start in edc sysfs debug print.
[SCSI] qla2xxx: Update firmware version after flash update for ISP82xx.
[SCSI] qla2xxx: Fix hang during driver unload when vport is active.
[SCSI] qla2xxx: Properly set the dsd_list_len for dsd_chaining in cmd type 6.
[SCSI] qla2xxx: Fix virtual port failing to login after chip reset.
[SCSI] qla2xxx: Fix vport delete hang when logins are outstanding.
[SCSI] hpsa: Change memset using sizeof(ptr) to sizeof(*ptr)
[SCSI] ipr: Rate limit DMA mapping errors
[SCSI] hpsa: add P2000 to list of shared SAS devices
[SCSI] hpsa: do not attempt PCI power management reset method if we know it won't work.
[SCSI] hpsa: remove superfluous sleeps around reset code
...
* git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw: (32 commits)
GFS2: Move all locking inside the inode creation function
GFS2: Clean up symlink creation
GFS2: Clean up mkdir
GFS2: Use UUID field in generic superblock
GFS2: Rename ops_inode.c to inode.c
GFS2: Inode.c is empty now, remove it
GFS2: Move final part of inode.c into super.c
GFS2: Move most of the remaining inode.c into ops_inode.c
GFS2: Move gfs2_refresh_inode() and friends into glops.c
GFS2: Remove gfs2_dinode_print() function
GFS2: When adding a new dir entry, inc link count if it is a subdir
GFS2: Make gfs2_dir_del update link count when required
GFS2: Don't use gfs2_change_nlink in link syscall
GFS2: Don't use a try lock when promoting to a higher mode
GFS2: Double check link count under glock
GFS2: Improve bug trap code in ->releasepage()
GFS2: Fix ail list traversal
GFS2: make sure fallocate bytes is a multiple of blksize
GFS2: Add an AIL writeback tracepoint
GFS2: Make writeback more responsive to system conditions
...
* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (152 commits)
powerpc: Fix hard CPU IDs detection
powerpc/pmac: Update via-pmu to new syscore_ops
powerpc/kvm: Fix the build for 32-bit Book 3S (classic) processors
powerpc/kvm: Fix kvmppc_core_pending_dec
powerpc: Remove last piece of GEMINI
powerpc: Fix for Pegasos keyboard and mouse
powerpc: Make early memory scan more resilient to out of order nodes
powerpc/pseries/iommu: Cleanup ddw naming
powerpc/pseries/iommu: Find windows after kexec during boot
powerpc/pseries/iommu: Remove ddw property when destroying window
powerpc/pseries/iommu: Add additional checks when changing iommu mask
powerpc/pseries/iommu: Use correct return type in dupe_ddw_if_already_created
powerpc: Remove unused/obsolete CONFIG_XICS
misc: Add CARMA DATA-FPGA Programmer support
misc: Add CARMA DATA-FPGA Access Driver
powerpc: Make IRQ_NOREQUEST last to clear, first to set
powerpc: Integrated Flash controller device tree bindings
powerpc/85xx: Create dts of each core in CAMP mode for P1020RDB
powerpc/85xx: Fix PCIe IDSEL for Px020RDB
powerpc/85xx: P2020 DTS: re-organize dts files
...
Commit e66eed651f ("list: remove prefetching from regular list
iterators") removed the include of prefetch.h from list.h and this was a
path to including asm/processor.h. We need to include it excplicitly
now.
Fixes this build error on sparc32 (at least):
In file included 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/sparc/kernel/asm-offsets.c:13:
include/linux/spinlock.h: In function 'spin_unlock_wait':
include/linux/spinlock.h:360: error: implicit declaration of function 'cpu_relax
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Commit e66eed651f ("list: remove prefetching from regular list
iterators") removed the include of prefetch.h from list.h, which
uncovered several cases that had apparently relied on that rather
obscure header file dependency.
So this fixes things up a bit, using
grep -L linux/prefetch.h $(git grep -l '[^a-z_]prefetchw*(' -- '*.[ch]')
grep -L 'prefetchw*(' $(git grep -l 'linux/prefetch.h' -- '*.[ch]')
to guide us in finding files that either need <linux/prefetch.h>
inclusion, or have it despite not needing it.
There are more of them around (mostly network drivers), but this gets
many core ones.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
commit a35e2c1b6d (macvlan: use rx_handler_data pointer to store
macvlan_port pointer V2) added a bug in macvlan_port_create()
Steps to reproduce the bug:
# ifenslave bond0 eth0 eth1
# ip link add link eth0 up name eth0#1 type macvlan
->error EBUSY
# ip link add link eth0 up name eth0#1 type macvlan
->panic
Fix: Dont set IFF_MACVLAN_PORT in error case.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
core_kernel_data() wants to know if an address looks like kernel
data. IA64 has had _edata forever, but never needed _sdata until
now.
Signed-off-by: Tony Luck <tony.luck@intel.com>
Geert Uytterhoeven ran a dependency checker which kicked out this warning:
+ warning: (ACPI_APEI) selects PSTORE which has unmet direct dependencies (MISC_FILESYSTEMS): => N/A
Randy confirmed that the fix was to "select MISC_FILESYSTEMS" too.
Tested-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Fix to earlier "Simplify invalidate part (try #6)" patch
That patch caused problems with connectathon test 5.
Reviewed-by: Jeff Layton <jlayton@samba.org>
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <sfrench@us.ibm.com>
commit 9d07bc841c
"powerpc: Properly handshake CPUs going out of boot spin loop"
Would cause a miscalculation of the hard CPU ID. It removes breaking
out of the loop when finding a match with a processor, thus the "i"
used as an index in the intserv array is always incorrect
This broke interrupt on my PowerMac laptop.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
A new utility function (core_kernel_data()) is used to determine if a
passed in address is part of core kernel data or not. It may or may not
return true for RO data, but this utility must work for RW data.
Thus both _sdata and _edata must be defined and continuous,
without .init sections that may later be freed and replaced by
volatile memory (memory that can be freed).
This utility function is used to determine if data is safe from
ever being freed. Thus it should return true for all RW global
data that is not in a module or has been allocated, or false
otherwise.
Also change core_kernel_data() back to the more precise _sdata condition
and document the function.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Hirokazu Takata <takata@linux-m32r.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: linux-m68k@lists.linux-m68k.org
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Helge Deller <deller@gmx.de>
Cc: JamesE.J.Bottomley <jejb@parisc-linux.org>
Link: http://lkml.kernel.org/r/1305855298.1465.19.camel@gandalf.stny.rr.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
----
arch/alpha/kernel/vmlinux.lds.S | 1 +
arch/m32r/kernel/vmlinux.lds.S | 1 +
arch/m68k/kernel/vmlinux-std.lds | 2 ++
arch/m68k/kernel/vmlinux-sun3.lds | 1 +
arch/mips/kernel/vmlinux.lds.S | 1 +
arch/parisc/kernel/vmlinux.lds.S | 3 +++
kernel/extable.c | 12 +++++++++++-
7 files changed, 20 insertions(+), 1 deletion(-)
Merge reason: One pending commit was left in perf/core after Linus merged
perf/core - continue v2.6.40 work in the perf/urgent reason.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Manual merge of arch/powerpc/kernel/smp.c and add missing scheduler_ipi()
call to arch/powerpc/platforms/cell/interrupt.c
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Commit dabc5c670d, entitled
"tg3: Move TSO_CAPABLE assignment", moved some TSO flagging code around.
In the process it failed to add braces around an exceptional 5906
condition. This patch fixes the problem.
Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Mahesh Bandewar noticed that the features cleanup in commit
0da0606f49, entitled
"tg3: Consolidate all netdev feature assignments", mistakenly sets
NETIF_F_LOOPBACK by default. This patch corrects the error.
Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: Mahesh Bandewar <maheshb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
When one macvlan device is dismantled, we can avoid one
synchronize_rcu() call done after deletion from hash list, since caller
will perform a synchronize_net() call after its ndo_stop() call.
Add a new netdev->dismantle field to signal this dismantle intent.
Reduces RTNL hold time.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Patrick McHardy <kaber@trash.net>
CC: Ben Greear <greearb@candelatech.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
There is no point in counting hits - we can calculate it from the number
of lookups and misses.
This makes the avc statistics a bit smaller, and makes the code
generation better too.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Commits a5d4f3ad3a ("powerpc: Base support for exceptions using
HSRR0/1") and 673b189a2e ("powerpc: Always use SPRN_SPRG_HSCRATCH0
when running in HV mode") cause compile and link errors for 32-bit
classic Book 3S processors when KVM is enabled. This fixes these
errors.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
The vcpu->arch.pending_exceptions field is a bitfield indexed by
interrupt priority number as returned by kvmppc_book3s_vec2irqprio.
However, kvmppc_core_pending_dec was using an interrupt vector shifted
by 7 as the bit index. Fix it to use the irqprio value for the
decrementer interrupt instead. This problem was found by code
inspection.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
You can turn off the avc cache stats, but distributions seem to not do
that (perhaps because several performance tuning how-to's talk about the
avc cache statistics).
Which is sad, because the code it generates is truly horrendous, with
the statistics update being sandwitched between get_cpu/put_cpu which in
turn causes preemption disables etc. We're talking ten+ instructions
just to increment a per-cpu variable in some pretty hot code.
Fix the craziness by just using 'this_cpu_inc()' instead. Suddenly we
only need a single 'inc' instruction to increment the statistics. This
is quite noticeable in the incredibly hot avc_has_perm_noaudit()
function (which triggers all the statistics by virtue of doing an
avc_lookup() call).
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linus Torvalds