As this file is included literally, ZERO WIDTH SPACE causes
"make pdfdocs" to emit messages which read:
Missing character: There is no (U+200B) in font DejaVu Sans Mono/OT:script=latn;language=dflt;!
Missing character: There is no (U+200B) in font DejaVu Sans Mono/OT:script=latn;language=dflt;!
U+200B (ZERO WIDTH SPADE) has no effect in literal blocks.
Remove them and get rid of those noises.
Signed-off-by: Akira Yokosawa <akiyks@gmail.com>
Acked-by: Carlos Bilbao <carlos.bilbao@amd.com>
Link: https://lore.kernel.org/r/c38176c7-c30a-4c2c-3516-8d3be1c267dc@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
As the first step in bringing some order to our architecture-specific
documentation, create a top-level arch/ directory and move arch.rst as its
index.rst file.
There is no change in the rendered docs at this point.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Add a text explaining how to quickly build a kernel, as that's something
users will often have to do when they want to report an issue or test
proposed fixes. This is a huge and frightening task for quite a few
users these days, as many rely on pre-compiled kernels and have never
built their own. They find help on quite a few websites explaining the
process in various ways, but those howtos often omit important details
or make things too hard for the 'quickly build just for testing' case
that 'localmodconfig' is really useful for. Hence give users something
at hand to guide them, as that makes it easier for them to help with
testing, debugging, and fixing the kernel.
To keep the complexity at bay, the document explicitly focuses on how to
compile the kernel on commodity distributions running on commodity
hardware. People that deal with less common distributions or hardware
will often know their way around already anyway.
The text describes a few oddities of Arch and Debian that were found by
the author and a few volunteers that tested the described procedure.
There are likely more such quirks that need to be covered as well as a
few things the author will have missed -- but one has to start
somewhere.
The document heavily uses anchors and links to them, which makes things
slightly harder to read in the source form. But the intended target
audience is way more likely to read rendered versions of this text on
pages like docs.kernel.org anyway -- and there those anchors and links
allow easy jumps to the reference section and back, which makes the
document a lot easier to work with for the intended target audience.
Aspects relevant for bisection were left out on purpose, as that is a
related, but in the end different use case. The rough plan is to have a
second document with a similar style to cover bisection. The idea is to
reuse a few bits from this document and link quite often to entries in
the reference section with the help of the anchors in this text.
Signed-off-by: Thorsten Leemhuis <linux@leemhuis.info>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/1a788a8e7ba8a2063df08668f565efa832016032.1678021408.git.linux@leemhuis.info
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
commit b041b525da ("x86/split_lock: Make life miserable for split
lockers") added a delay and serialization of split locks. Commit
727209376f ("x86/split_lock: Add sysctl to control the misery mode")
provided a sysctl to turn off the misery.
Update the split lock documentation to describe the current state of
the code.
Signed-off-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/r/20230315225722.104607-1-tony.luck@intel.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Sort all of the "no..." kernel parameters into the correct order
as specified in kernel-parameters.rst: "into English Dictionary order
(defined as ignoring all punctuation and sorting digits before letters
in a case insensitive manner)".
No other changes here, just movement of lines.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20230317002635.16540-1-rdunlap@infradead.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Major update for maintainer-pgp-guide
commit e441273947 ("Documentation: raise minimum supported version of binutils to 2.25")
commit 67fe6792a7 ("Documentation: stable: Document alternative for referring upstream commit hash")
commit 8763a30bc1 ("docs: deprecated.rst: Add note about DECLARE_FLEX_ARRAY() usage
commit 2f993509a9 ("docs: process/5.Posting.rst: clarify use of Reported-by: tag")
commit a31323bef2 ("timers: Update the documentation to reflect on the new timer_shutdown() API")
Signed-off-by: Federico Vaga <federico.vaga@vaga.pv.it>
Link: https://lore.kernel.org/r/20230319134624.21327-1-federico.vaga@vaga.pv.it
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
The general changelog rules for the tip tree refers to "Describe your
changes" section of submitting patches guide. However, the internal link
reference targets to non-existent "submittingpatches" label, which
brings reader to the top of the linked doc.
Correct the target. No changes to submitting-patches.rst since the
required label is already there.
Fixes: 31c9d7c829 ("Documentation/process: Add tip tree handbook")
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230320124327.174881-1-bagasdotme@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Add an example of memory layout with interleaving nodes where even memory
banks belong to node 0 and odd memory banks belong to node 1
Suggested-by: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20230213154447.1631847-1-rppt@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Replace the content of the qnx4 README file with the canonical place for
such information.
Add the credits of the qnx4 contribution to CREDITS. As there is already a
QNX4 FILESYSTEM section in MAINTAINERS, it is clear who to contact and send
patches to.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Acked-By: Anders Larsen <al@alarsen.net>
Link: https://lore.kernel.org/r/20230220170210.15677-3-lukas.bulwahn@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Replace the content of the qnx6 README file with the canonical places for
such information.
Add the credits of the qnx6 contribution to CREDITS, and add an section in
MAINTAINERS to mark this filesystem as Orphan, as the domain ontika.net and
email address does not resolve to an IP address anymore.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Link: https://lore.kernel.org/r/20230220170210.15677-2-lukas.bulwahn@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
For the list of kernel published books, include publication covering kernel
debugging from August, 2022 (ISBN 978-1801075039) and one from March, 2021
on the topic of char device drivers and kernel synchronization (ISBN
978-1801079518). Also add foundational book from Robert Love (ISBN
978-1449339531) and remove extra spaces.
Co-developed-by: Kaiwan N Billimoria <kaiwan.billimoria@gmail.com>
Signed-off-by: Kaiwan N Billimoria <kaiwan.billimoria@gmail.com>
Signed-off-by: Carlos Bilbao <carlos.bilbao@amd.com>
Link: https://lore.kernel.org/r/20230222183445.3127324-1-carlos.bilbao@amd.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Sort the NFS kernel command line parameters. This is done in 4 groups
so as to not have them intermingled: 'nfs' module parameters, 'nfs4'
module parameters, 'nfsd' module parameters, and nfs "global" (__setup,
no module) parameters.
There were 5 parameters which were listed with a space between the
parameter name and the following '=' sign. The space has been
removed since module parameters expect 'parameter=' with no intervening
space.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: Anna Schumaker <anna@kernel.org>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: linux-nfs@vger.kernel.org
Link: https://lore.kernel.org/r/20230227025816.1083-1-rdunlap@infradead.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Replace link to a non-existing page with a note that lanana.org does not
maintain Linux Zone Unicode Assignments anymore.
Remove the reference to H. Peter Anvin and the unicode lanana.org email as
the maintainer of this file, as at this point, this is all maintained by
the general kernel community.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Link: https://lore.kernel.org/r/20230307144000.29539-3-lukas.bulwahn@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
As described in Documentation/admin-guide/devices.rst, the device number
registry (or linux device list) is at Documentation/admin-guide/devices.txt
and no longer maintained at lanana.org.
The devices.txt file is basically community-maintained, and there is no
other dedicated maintainer or contact for that file nowadays.
Remove the historic section DEVICE NUMBER REGISTRY in MAINTAINERS.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Link: https://lore.kernel.org/r/20230307144000.29539-2-lukas.bulwahn@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
As a follow-up to a discussion at the 2021 Maintainer's Summit on the
topic of maintainer recruitment and retention, the TAB took on the
task of creating a document which to help companies and other
organizations to grow in their ability to engage with the Linux Kernel
development community, using the Maturity Model[2] framework.
The goal is to encourage, in a management-friendly way, companies to
allow their engineers to contribute with the upstream Linux Kernel
development community, so we can grow the "talent pipeline" for
contributors to become respected leaders, and eventually kernel
maintainers.
[1] https://lwn.net/Articles/870581/
[2] https://en.wikipedia.org/wiki/Maturity_model
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Co-developed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Co-developed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Jonathan Corbet <corbet@lwn.net>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20230308190403.2157046-1-tytso@mit.edu
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Update URL for the latest online version of this document.
Correct "files" to "fields" in a few places.
Update /proc/scsi, /proc/stat, and /proc/fs/ext4 information.
Drop /usr/src/ from the location of the kernel source tree.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
Reviewed-by: Christian Brauner <brauner@kernel.org>
Link: https://lore.kernel.org/r/20230314060347.605-1-rdunlap@infradead.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
The text points to a different header file, fix by changing
the path to "uapi".
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Link: https://lore.kernel.org/r/20230310095857.985814-1-jiri@resnulli.us
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
In the second paragraph of section "Respond to review comments", there is
a spelling mistake: "aganst" should be "against".
Signed-off-by: Xujun Leng <lengxujun2007@126.com>
Link: https://lore.kernel.org/r/20230312071423.3042-1-lengxujun2007@126.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
The "^0" syntax is no longer needed to fast-forward to a mainline commit;
take that out and add --ff-only to force an error if fast-forward is not
possible.
Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
[jc: rewrote changelog]
Link: https://lore.kernel.org/r/20230228134657.1797871-1-u.kleine-koenig@pengutronix.de
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Following the C text in the file, add a mention about the Rust
programming language, the currently supported compiler and
the edition used (similar to the "dialect" mention for C).
Similarly, add a mention about the unstable features used (similar
to the "extensions" mentions for C).
In addition, add some links to complement the information.
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Link: https://lore.kernel.org/r/20230306191712.230658-2-ojeda@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
The Intel compiler support has been removed in commit 95207db816
("Remove Intel compiler support").
Thus remove its mention in the Documentation too.
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lore.kernel.org/r/20230306191712.230658-1-ojeda@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
The details for struct dentry_operations member d_weak_revalidate is
missing a "d_" prefix.
Fixes: af96c1e304 ("docs: filesystems: vfs: Convert vfs.txt to RST")
Signed-off-by: Glenn Washburn <development@efficientek.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lore.kernel.org/r/20230227184042.2375235-1-development@efficientek.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit 7d2078310c ("dt-bindings: arm: move cpu-capacity to a
shared loation") updates some references about capacity-dmips-mhz
property in this document.
The list of architectures using capacity-dmips-mhz omits RISC-V, so
supplements it here.
Signed-off-by: Song Shuai <suagrfillet@gmail.com>
Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com> # English
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Reviewed-by: Alex Shi <alexs@kernel.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230227105941.2749193-1-suagrfillet@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Commit aa47a7c215 ("lib/cpumask: deprecate nr_cpumask_bits") resulted
in the cpumask operations potentially becoming hugely less efficient,
because suddenly the cpumask was always considered to be variable-sized.
The optimization was then later added back in a limited form by commit
6f9c07be9d ("lib/cpumask: add FORCE_NR_CPUS config option"), but that
FORCE_NR_CPUS option is not useful in a generic kernel and more of a
special case for embedded situations with fixed hardware.
Instead, just re-introduce the optimization, with some changes.
Instead of depending on CPUMASK_OFFSTACK being false, and then always
using the full constant cpumask width, this introduces three different
cpumask "sizes":
- the exact size (nr_cpumask_bits) remains identical to nr_cpu_ids.
This is used for situations where we should use the exact size.
- the "small" size (small_cpumask_bits) is the NR_CPUS constant if it
fits in a single word and the bitmap operations thus end up able
to trigger the "small_const_nbits()" optimizations.
This is used for the operations that have optimized single-word
cases that get inlined, notably the bit find and scanning functions.
- the "large" size (large_cpumask_bits) is the NR_CPUS constant if it
is an sufficiently small constant that makes simple "copy" and
"clear" operations more efficient.
This is arbitrarily set at four words or less.
As a an example of this situation, without this fixed size optimization,
cpumask_clear() will generate code like
movl nr_cpu_ids(%rip), %edx
addq $63, %rdx
shrq $3, %rdx
andl $-8, %edx
callq memset@PLT
on x86-64, because it would calculate the "exact" number of longwords
that need to be cleared.
In contrast, with this patch, using a MAX_CPU of 64 (which is quite a
reasonable value to use), the above becomes a single
movq $0,cpumask
instruction instead, because instead of caring to figure out exactly how
many CPU's the system has, it just knows that the cpumask will be a
single word and can just clear it all.
Note that this does end up tightening the rules a bit from the original
version in another way: operations that set bits in the cpumask are now
limited to the actual nr_cpu_ids limit, whereas we used to do the
nr_cpumask_bits thing almost everywhere in the cpumask code.
But if you just clear bits, or scan for bits, we can use the simpler
compile-time constants.
In the process, remove 'cpumask_complement()' and 'for_each_cpu_not()'
which were not useful, and which fundamentally have to be limited to
'nr_cpu_ids'. Better remove them now than have somebody introduce use
of them later.
Of course, on x86-64 with MAXSMP there is no sane small compile-time
constant for the cpumask sizes, and we end up using the actual CPU bits,
and will generate the above kind of horrors regardless. Please don't
use MAXSMP unless you really expect to have machines with thousands of
cores.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
- Return -EIO instead of success when the certificate buffer for SEV
guests is not large enough.
- Allow STIPB to be enabled with legacy IBSR. Legacy IBRS is cleared on
return to userspace for performance reasons, but the leaves user space
vulnerable to cross-thread attacks which STIBP prevents. Update the
documentation accordingly.
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Merge tag 'x86-urgent-2023-03-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 updates from Thomas Gleixner:
"A small set of updates for x86:
- Return -EIO instead of success when the certificate buffer for SEV
guests is not large enough
- Allow STIPB to be enabled with legacy IBSR. Legacy IBRS is cleared
on return to userspace for performance reasons, but the leaves user
space vulnerable to cross-thread attacks which STIBP prevents.
Update the documentation accordingly"
* tag 'x86-urgent-2023-03-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
virt/sev-guest: Return -EIO if certificate buffer is not large enough
Documentation/hw-vuln: Document the interaction between IBRS and STIBP
x86/speculation: Allow enabling STIBP with legacy IBRS
- Prevent possible NULL pointer derefences in irq_data_get_affinity_mask()
and irq_domain_create_hierarchy().
- Take the per device MSI lock before invoking code which relies
on it being hold.
- Make sure that MSI descriptors are unreferenced before freeing
them. This was overlooked when the platform MSI code was converted to
use core infrastructure and results in a fals positive warning.
- Remove dead code in the MSI subsystem.
- Clarify the documentation for pci_msix_free_irq().
- More kobj_type constification.
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Merge tag 'irq-urgent-2023-03-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irq updates from Thomas Gleixner:
"A set of updates for the interrupt susbsystem:
- Prevent possible NULL pointer derefences in
irq_data_get_affinity_mask() and irq_domain_create_hierarchy()
- Take the per device MSI lock before invoking code which relies on
it being hold
- Make sure that MSI descriptors are unreferenced before freeing
them. This was overlooked when the platform MSI code was converted
to use core infrastructure and results in a fals positive warning
- Remove dead code in the MSI subsystem
- Clarify the documentation for pci_msix_free_irq()
- More kobj_type constification"
* tag 'irq-urgent-2023-03-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
genirq/msi, platform-msi: Ensure that MSI descriptors are unreferenced
genirq/msi: Drop dead domain name assignment
irqdomain: Add missing NULL pointer check in irq_domain_create_hierarchy()
genirq/irqdesc: Make kobj_type structures constant
PCI/MSI: Clarify usage of pci_msix_free_irq()
genirq/msi: Take the per-device MSI lock before validating the control structure
genirq/ipi: Fix NULL pointer deref in irq_data_get_affinity_mask()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Merge tag 'pull-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs update from Al Viro:
"Adding Christian Brauner as VFS co-maintainer"
* tag 'pull-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
Adding VFS co-maintainer
Some of the page fault handlers do not deal with the following case
correctly:
* handle_mm_fault() has returned VM_FAULT_RETRY
* there is a pending fatal signal
* fault had happened in kernel mode
Correct action in such case is not "return unconditionally" - fatal
signals are handled only upon return to userland and something like
copy_to_user() would end up retrying the faulting instruction and
triggering the same fault again and again.
What we need to do in such case is to make the caller to treat that
as failed uaccess attempt - handle exception if there is an exception
handler for faulting instruction or oops if there isn't one.
Over the years some architectures had been fixed and now are handling
that case properly; some still do not. This series should fix the
remaining ones.
Status:
m68k, riscv, hexagon, parisc: tested/acked by maintainers.
alpha, sparc32, sparc64: tested locally - bug has been
reproduced on the unpatched kernel and verified to be fixed by
this series.
ia64, microblaze, nios2, openrisc: build, but otherwise
completely untested.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Merge tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull VM_FAULT_RETRY fixes from Al Viro:
"Some of the page fault handlers do not deal with the following case
correctly:
- handle_mm_fault() has returned VM_FAULT_RETRY
- there is a pending fatal signal
- fault had happened in kernel mode
Correct action in such case is not "return unconditionally" - fatal
signals are handled only upon return to userland and something like
copy_to_user() would end up retrying the faulting instruction and
triggering the same fault again and again.
What we need to do in such case is to make the caller to treat that as
failed uaccess attempt - handle exception if there is an exception
handler for faulting instruction or oops if there isn't one.
Over the years some architectures had been fixed and now are handling
that case properly; some still do not. This series should fix the
remaining ones.
Status:
- m68k, riscv, hexagon, parisc: tested/acked by maintainers.
- alpha, sparc32, sparc64: tested locally - bug has been reproduced
on the unpatched kernel and verified to be fixed by this series.
- ia64, microblaze, nios2, openrisc: build, but otherwise completely
untested"
* tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
openrisc: fix livelock in uaccess
nios2: fix livelock in uaccess
microblaze: fix livelock in uaccess
ia64: fix livelock in uaccess
sparc: fix livelock in uaccess
alpha: fix livelock in uaccess
parisc: fix livelock in uaccess
hexagon: fix livelock in uaccess
riscv: fix livelock in uaccess
m68k: fix livelock in uaccess
include/linux/compiler-intel.h had no update in the past 3 years.
We often forget about the third C compiler to build the kernel.
For example, commit a0a12c3ed0 ("asm goto: eradicate CC_HAS_ASM_GOTO")
only mentioned GCC and Clang.
init/Kconfig defines CC_IS_GCC and CC_IS_CLANG but not CC_IS_ICC,
and nobody has reported any issue.
I guess the Intel Compiler support is broken, and nobody is caring
about it.
Harald Arnesen pointed out ICC (classic Intel C/C++ compiler) is
deprecated:
$ icc -v
icc: remark #10441: The Intel(R) C++ Compiler Classic (ICC) is
deprecated and will be removed from product release in the second half
of 2023. The Intel(R) oneAPI DPC++/C++ Compiler (ICX) is the recommended
compiler moving forward. Please transition to use this compiler. Use
'-diag-disable=10441' to disable this message.
icc version 2021.7.0 (gcc version 12.1.0 compatibility)
Arnd Bergmann provided a link to the article, "Intel C/C++ compilers
complete adoption of LLVM".
lib/zstd/common/compiler.h and lib/zstd/compress/zstd_fast.c were kept
untouched for better sync with https://github.com/facebook/zstd
Link: https://www.intel.com/content/www/us/en/developer/articles/technical/adoption-of-llvm-complete-icx.html
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The migration code ends up temporarily stashing information of the wrong
type in unused fields of the newly allocated destination folio. That
all works fine, but gcc does complain about the pointer type mis-use:
mm/migrate.c: In function ‘__migrate_folio_extract’:
mm/migrate.c:1050:20: note: randstruct: casting between randomized structure pointer types (ssa): ‘struct anon_vma’ and ‘struct address_space’
1050 | *anon_vmap = (void *)dst->mapping;
| ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
and gcc is actually right to complain since it really doesn't understand
that this is a very temporary special case where this is ok.
This could be fixed in different ways by just obfuscating the assignment
sufficiently that gcc doesn't see what is going on, but the truly
"proper C" way to do this is by explicitly using a union.
Using unions for type conversions like this is normally hugely ugly and
syntactically nasty, but this really is one of the few cases where we
want to make it clear that we're not doing type conversion, we're really
re-using the value bit-for-bit just using another type.
IOW, this should not become a common pattern, but in this one case using
that odd union is probably the best way to document to the compiler what
is conceptually going on here.
[ Side note: there are valid cases where we convert pointers to other
pointer types, notably the whole "folio vs page" situation, where the
types actually have fundamental commonalities.
The fact that the gcc note is limited to just randomized structures
means that we don't see equivalent warnings for those cases, but it
migth also mean that we miss other cases where we do play these kinds
of dodgy games, and this kind of explicit conversion might be a good
idea. ]
I verified that at least for an allmodconfig build on x86-64, this
generates the exact same code, apart from line numbers and assembler
comment changes.
Fixes: 64c8902ed4 ("migrate_pages: split unmap_and_move() to _unmap() and _move()")
Cc: Huang, Ying <ying.huang@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel. Seven are cc:stable and eight address post-6.3 issues or were
judged unsuitable for -stable backporting.
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Merge tag 'mm-hotfixes-stable-2023-03-04-13-12' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull misc fixes from Andrew Morton:
"17 hotfixes.
Eight are for MM and seven are for other parts of the kernel. Seven
are cc:stable and eight address post-6.3 issues or were judged
unsuitable for -stable backporting"
* tag 'mm-hotfixes-stable-2023-03-04-13-12' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
mailmap: map Dikshita Agarwal's old address to his current one
mailmap: map Vikash Garodia's old address to his current one
fs/cramfs/inode.c: initialize file_ra_state
fs: hfsplus: fix UAF issue in hfsplus_put_super
panic: fix the panic_print NMI backtrace setting
lib: parser: update documentation for match_NUMBER functions
kasan, x86: don't rename memintrinsics in uninstrumented files
kasan: test: fix test for new meminstrinsic instrumentation
kasan: treat meminstrinsic as builtins in uninstrumented files
kasan: emit different calls for instrumentable memintrinsics
ocfs2: fix non-auto defrag path not working issue
ocfs2: fix defrag path triggering jbd2 ASSERT
mailmap: map Georgi Djakov's old Linaro address to his current one
mm/hwpoison: convert TTU_IGNORE_HWPOISON to TTU_HWPOISON
lib/zlib: DFLTCC deflate does not write all available bits for Z_NO_FLUSH
mm/damon/paddr: fix missing folio_put()
mm/mremap: fix dup_anon_vma() in vma_merge() case 4
- Drop orphaned VAS MAINTAINERS entry.
- Fix build errors with clang and KCSAN.
- Avoid build errors seen with LD_DEAD_CODE_DATA_ELIMINATION & recordmcount.
Thanks to: Nathan Chancellor
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Merge tag 'powerpc-6.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fixes from Michael Ellerman:
- Drop orphaned VAS MAINTAINERS entry
- Fix build errors with clang and KCSAN
- Avoid build errors seen with LD_DEAD_CODE_DATA_ELIMINATION together
with recordmcount
Thanks to Nathan Chancellor.
* tag 'powerpc-6.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
powerpc: Avoid dead code/data elimination when using recordmcount
powerpc/vmlinux.lds: Add .text.asan/tsan sections
powerpc: Drop orphaned VAS MAINTAINERS entry
A collection of various small fixes that have been gathered since
the last PR. The majority of changes are for ASoC, and there is
a small change in ASoC PCM core, but the rest are all for driver-
specific fixes / quirks / updates.
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Merge tag 'sound-fix-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Pull sound fixes from Takashi Iwai:
"A collection of various small fixes that have been gathered since the
last PR.
The majority of changes are for ASoC, and there is a small change in
ASoC PCM core, but the rest are all for driver- specific fixes /
quirks / updates"
* tag 'sound-fix-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: (32 commits)
ALSA: ice1712: Delete unreachable code in aureon_add_controls()
ALSA: ice1712: Do not left ice->gpio_mutex locked in aureon_add_controls()
ALSA: hda/realtek: Add quirk for HP EliteDesk 800 G6 Tower PC
ALSA: hda/realtek: Improve support for Dell Precision 3260
ASoC: mediatek: mt8195: add missing initialization
ASoC: mediatek: mt8188: add missing initialization
ASoC: amd: yc: Add DMI entries to support HP OMEN 16-n0xxx (8A43)
ASoC: zl38060 add gpiolib dependency
ASoC: sam9g20ek: Disable capture unless building with microphone input
ASoC: mt8192: Fix range for sidetone positive gain
ASoC: mt8192: Report an error if when an invalid sidetone gain is written
ASoC: mt8192: Fix event generation for controls
ASoC: mt8192: Remove spammy log messages
ASoC: mchp-pdmc: fix poc noise at capture startup
ASoC: dt-bindings: sama7g5-pdmc: add microchip,startup-delay-us binding
ASoC: soc-pcm: add option to start DMA after DAI
ASoC: mt8183: Fix event generation for I2S DAI operations
ASoC: mt8183: Remove spammy logging from I2S DAI driver
ASoC: mt6358: Remove undefined HPx Mux enumeration values
ASoC: mt6358: Validate Wake on Voice 2 writes
...
- Fix DT binding for Richtek RT9467
- Fix a NULL pointer check in the power-supply core
- Document meaning of absent "present" property
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Merge tag 'for-v6.3-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply
Pull more power supply updates from Sebastian Reichel:
- Fix DT binding for Richtek RT9467
- Fix a NULL pointer check in the power-supply core
- Document meaning of absent "present" property
* tag 'for-v6.3-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply:
dt-bindings: power: supply: Revise Richtek RT9467 compatible name
ABI: testing: sysfs-class-power: Document absence of "present" property
power: supply: fix null pointer check order in __power_supply_register
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Merge tag '6.3-rc-smb3-client-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6
Pull more cifs updates from Steve French:
- xfstest generic/208 fix (memory leak)
- minor netfs fix (to address smatch warning)
- a DFS fix for stable
- a reconnect race fix
- two multichannel fixes
- RDMA (smbdirect) fix
- two additional writeback fixes from David
* tag '6.3-rc-smb3-client-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6:
cifs: Fix memory leak in direct I/O
cifs: prevent data race in cifs_reconnect_tcon()
cifs: improve checking of DFS links over STATUS_OBJECT_NAME_INVALID
iov: Fix netfs_extract_user_to_sg()
cifs: Fix cifs_write_back_from_locked_folio()
cifs: reuse cifs_match_ipaddr for comparison of dstaddr too
cifs: match even the scope id for ipv6 addresses
cifs: Fix an uninitialised variable
cifs: Add some missing xas_retry() calls
The usermodehelper code uses two fake pointers for the two capability
cases: CAP_BSET for reading and writing 'usermodehelper_bset', and
CAP_PI to read and write 'usermodehelper_inheritable'.
This seems to be a completely unnecessary indirection, since we could
instead just use the pointers themselves, and never have to do any "if
this then that" kind of logic.
So just get rid of the fake pointer values, and use the real pointer
values instead.
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Kees Cook <keescook@chromium.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This branch makes a couple of changes in make coccicheck related to
shell commands.
It also updates the api/atomic_as_refcounter semantic patch to include
WARNING in the output message, as done in other cases.
Signed-off-by: Julia Lawall <julia.lawall@inria.fr>
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Merge tag 'cocci-for-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/jlawall/linux
Pull coccinelle updates from Julia Lawall:
"Changes in make coccicheck and improve a semantic patch
This makes a couple of changes in make coccicheck related to shell
commands.
It also updates the api/atomic_as_refcounter semantic patch to include
WARNING in the output message, as done in other cases"
* tag 'cocci-for-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/jlawall/linux:
scripts: coccicheck: Use /usr/bin/env
scripts: coccicheck: Avoid warning about spurious escape
coccinelle: api/atomic_as_refcounter: include message type in output
A single build error fix: there was a change during the merge window
to a C header parsed by the Rust bindings generator, introducing a
type that it does not handle well. The fix tells the generator to
treat the type as opaque (for now).
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Merge tag 'rust-fixes-6.3-rc1' of https://github.com/Rust-for-Linux/linux
Pull Rust fix from Miguel Ojeda:
"A single build error fix: there was a change during the merge window
to a C header parsed by the Rust bindings generator, introducing a
type that it does not handle well.
The fix tells the generator to treat the type as opaque (for now)"
* tag 'rust-fixes-6.3-rc1' of https://github.com/Rust-for-Linux/linux:
rust: bindgen: Add `alt_instr` as opaque type
Updates that missed the first pull, mostly because of needing more
soak time. Driver updates (zfcp, ufs, mpi3mr, plus two ipr bug
fixes), an enclosure services (ses) update (mostly bug fixes) and
other minor bug fixes and changes.
Signed-off-by: James E.J. Bottomley <jejb@linux.ibm.com>
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Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Pull more SCSI updates from James Bottomley:
"Updates that missed the first pull, mostly because of needing more
soak time.
Driver updates (zfcp, ufs, mpi3mr, plus two ipr bug fixes), an
enclosure services (ses) update (mostly bug fixes) and other minor bug
fixes and changes"
* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (32 commits)
scsi: zfcp: Trace when request remove fails after qdio send fails
scsi: zfcp: Change the type of all fsf request id fields and variables to u64
scsi: zfcp: Make the type for accessing request hashtable buckets size_t
scsi: ufs: core: Simplify ufshcd_execute_start_stop()
scsi: ufs: core: Rely on the block layer for setting RQF_PM
scsi: core: Extend struct scsi_exec_args
scsi: lpfc: Fix double word in comments
scsi: core: Remove the /proc/scsi/${proc_name} directory earlier
scsi: core: Fix a source code comment
scsi: cxgbi: Remove unneeded version.h include
scsi: qedi: Remove unneeded version.h include
scsi: mpi3mr: Remove unneeded version.h include
scsi: mpi3mr: Fix missing mrioc->evtack_cmds initialization
scsi: mpi3mr: Use number of bits to manage bitmap sizes
scsi: mpi3mr: Remove unnecessary memcpy() to alltgt_info->dmi
scsi: mpi3mr: Fix issues in mpi3mr_get_all_tgt_info()
scsi: mpi3mr: Fix an issue found by KASAN
scsi: mpi3mr: Replace 1-element array with flex-array
scsi: ipr: Work around fortify-string warning
scsi: ipr: Make ipr_probe_ioa_part2() return void
...
Akira Yokosawa