- 07 May, 2021 39 commits
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Davidlohr Bueso authored
Patch series "fs/epoll: restore user-visible behavior upon event ready". This series tries to address a change in user visible behavior, reported in https://bugzilla.kernel.org/show_bug.cgi?id=208943. Epoll does not report an event to all the threads running epoll_wait() on the same epoll descriptor. Unsurprisingly, this was bisected back to 339ddb53 (fs/epoll: remove unnecessary wakeups of nested epoll), which has had various problems in the past, beyond only nested epoll usage. This patch (of 2): This incorporates the testcase originally reported in: https://bugzilla.kernel.org/show_bug.cgi?id=208943 Which ensures an event is reported to all threads blocked on the same epoll descriptor, otherwise only a single thread will receive the wakeup once the event become ready. Link: https://lkml.kernel.org/r/20210405231025.33829-1-dave@stgolabs.net Link: https://lkml.kernel.org/r/20210405231025.33829-2-dave@stgolabs.netSigned-off-by:
Davidlohr Bueso <dbueso@suse.de> Cc: Jason Baron <jbaron@akamai.com> Cc: Roman Penyaev <rpenyaev@suse.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Christophe JAILLET authored
The devm_ variant of 'kcalloc()' and 'kmalloc_array()' are not tested Add the corresponding check. Link: https://lkml.kernel.org/r/205fc4847972fb6779abcc8818f39c14d1b45af1.1618595794.git.christophe.jaillet@wanadoo.frSigned-off-by:
Christophe JAILLET <christophe.jaillet@wanadoo.fr> Acked-by:
Joe Perches <joe@perches.com> Signed-off-by:
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Vincent Mailhol authored
__must_be_array, offsetof, sizeof_field and __stringify are all preprocessor macros and do not evaluate their arguments. As such, it is safe not to warn when arguments are being reused in those four sub-expressions. Exclude those so that they can pass checkpatch. Link: https://lkml.kernel.org/r/20210407105042.25380-1-mailhol.vincent@wanadoo.frSigned-off-by:
Vincent Mailhol <mailhol.vincent@wanadoo.fr> Acked-by:
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Joe Perches authored
return sysfs_emit() uses should include a newline. Suggest adding a newline when one is missing. Add one using --fix too. Link: https://lkml.kernel.org/r/aa1819fa5faf786573df298e5e2e7d357ba7d4ad.camel@perches.comSigned-off-by:
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Masahiro Yamada authored
compat_sys##name is declared twice, just one line below. With this removal SYSCALL_DEFINEx() (defined in <linux/syscalls.h>) and COMPAT_SYSCALL_DEFINEx() look symmetrical. Link: https://lkml.kernel.org/r/20210223114924.854794-1-masahiroy@kernel.orgSigned-off-by:
Masahiro Yamada <masahiroy@kernel.org> Signed-off-by:
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Randy Dunlap authored
Mark match_uint() as kernel-doc notation since it is already fully annotated as such. Use % prefix on constants in kernel-doc comments. Convert function return descriptions to use the "Return:" kernel-doc notation. Link: https://lkml.kernel.org/r/20210407034514.5651-1-rdunlap@infradead.orgSigned-off-by:
Randy Dunlap <rdunlap@infradead.org> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: David Howells <dhowells@redhat.com> Signed-off-by:
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Alex Shi authored
Commit 52fbf113 ("lib/genalloc.c: fix allocation of aligned buffer from non-aligned chunk") added a new parameter 'start_addr' w/o description for it. That causes some doc compile warning: lib/genalloc.c:649: warning: Function parameter or member 'start_addr' not described in 'gen_pool_first_fit' lib/genalloc.c:667: warning: Function parameter or member 'start_addr' not described in 'gen_pool_first_fit_align' lib/genalloc.c:694: warning: Function parameter or member 'start_addr' not described in 'gen_pool_fixed_alloc' lib/genalloc.c:729: warning: Function parameter or member 'start_addr' not described in 'gen_pool_first_fit_order_align' lib/genalloc.c:752: warning: Function parameter or member 'start_addr' not described in 'gen_pool_best_fit' This fixes it by adding a parameter descriptions. Link: https://lkml.kernel.org/r/20210405132021.131231-1-alexs@kernel.orgSigned-off-by:
Alex Shi <alexs@kernel.org> Cc: Alexey Skidanov <alexey.skidanov@intel.com> Cc: Huang Shijie <sjhuang@iluvatar.ai> Cc: Alex Shi <alexs@kernel.org> Cc: Bhaskar Chowdhury <unixbhaskar@gmail.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by:
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Alex Shi authored
commit 3e8f399d ("writeback: rework wb_[dec|inc]_stat family of functions") add some function description of percpu_counter_add_batch. but the double '*' in comments means a kernel-doc format comment which isn't right. Since the whole file of lib/percpu_counter.c has no any other kernel-doc format comments, we'd better to remove this incomplete one to tame the kernel-doc warning: lib/percpu_counter.c:83: warning: Function parameter or member 'fbc' not described in 'percpu_counter_add_batch' lib/percpu_counter.c:83: warning: Function parameter or member 'amount' not described in 'percpu_counter_add_batch' lib/percpu_counter.c:83: warning: Function parameter or member 'batch' not described in 'percpu_counter_add_batch' Link: https://lkml.kernel.org/r/20210405135505.132446-1-alexs@kernel.orgSigned-off-by:
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Zqiang authored
In RT system, the spin_lock will be replaced by sleepable rt_mutex lock, in __call_rcu(), disable interrupts before calling kasan_record_aux_stack(), will trigger this calltrace: BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:951 in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 19, name: pgdatinit0 Call Trace: ___might_sleep.cold+0x1b2/0x1f1 rt_spin_lock+0x3b/0xb0 stack_depot_save+0x1b9/0x440 kasan_save_stack+0x32/0x40 kasan_record_aux_stack+0xa5/0xb0 __call_rcu+0x117/0x880 __exit_signal+0xafb/0x1180 release_task+0x1d6/0x480 exit_notify+0x303/0x750 do_exit+0x678/0xcf0 kthread+0x364/0x4f0 ret_from_fork+0x22/0x30 Replace spinlock with raw_spinlock. Link: https://lkml.kernel.org/r/20210329084009.27013-1-qiang.zhang@windriver.comSigned-off-by:Zqiang <qiang.zhang@windriver.com> Reported-by:
Andrew Halaney <ahalaney@redhat.com> Cc: Alexander Potapenko <glider@google.com> Cc: Gustavo A. R. Silva <gustavoars@kernel.org> Cc: Vijayanand Jitta <vjitta@codeaurora.org> Cc: Vinayak Menon <vinmenon@codeaurora.org> Cc: Yogesh Lal <ylal@codeaurora.org> Signed-off-by:
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Richard Fitzgerald authored
crc8() does not change the data passed to it, so the pointer argument should be declared const. This avoids callers that receive const data having to cast it to a non-const pointer to call crc8(). Link: https://lkml.kernel.org/r/20210329122409.3291-1-rf@opensource.cirrus.comSigned-off-by:
Richard Fitzgerald <rf@opensource.cirrus.com> Acked-by:
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Bhaskar Chowdhury authored
s/macthing/matching/ Link: https://lkml.kernel.org/r/20210326131530.30481-1-unixbhaskar@gmail.comSigned-off-by:
Bhaskar Chowdhury <unixbhaskar@gmail.com> Signed-off-by:
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ToastC authored
Replace beautiully with beautifully Link: https://lkml.kernel.org/r/20210315090633.9759-1-mrtoastcheng@gmail.comSigned-off-by:
ShihCheng Tu <mrtoastcheng@gmail.com> Signed-off-by:
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Wang Qing authored
Smatch gives the warning: lib/decompress_unlzma.c:395 process_bit1() warn: inconsistent indenting Link: https://lkml.kernel.org/r/1614567775-4478-1-git-send-email-wangqing@vivo.comSigned-off-by:
Wang Qing <wangqing@vivo.com> Signed-off-by:
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Bhaskar Chowdhury authored
s/buid/build/ Link: https://lkml.kernel.org/r/20210301123129.18754-1-unixbhaskar@gmail.comSigned-off-by:
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Yury Norov authored
Add myself as maintainer for bitmap API and Andy and Rasmus as reviewers. Link: https://lkml.kernel.org/r/20210401003153.97325-13-yury.norov@gmail.comSigned-off-by:
Yury Norov <yury.norov@gmail.com> Acked-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by:
Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Alexey Klimov <aklimov@redhat.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: David Sterba <dsterba@suse.com> Cc: Dennis Zhou <dennis@kernel.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Jianpeng Ma <jianpeng.ma@intel.com> Cc: Joe Perches <joe@perches.com> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Rich Felker <dalias@libc.org> Cc: Stefano Brivio <sbrivio@redhat.com> Cc: Wei Yang <richard.weiyang@linux.alibaba.com> Cc: Wolfram Sang <wsa+renesas@sang-engineering.com> Cc: Yoshinori Sato <ysato@users.osdn.me> Signed-off-by:
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Yury Norov authored
Add fast paths to find_*_bit() functions as per kernel implementation. Link: https://lkml.kernel.org/r/20210401003153.97325-12-yury.norov@gmail.comSigned-off-by:
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Yury Norov authored
Similarly to bitmap functions, users would benefit if we'll handle a case of small-size bitmaps that fit into a single word. While here, move the find_last_bit() declaration to bitops/find.h where other find_*_bit() functions sit. Link: https://lkml.kernel.org/r/20210401003153.97325-11-yury.norov@gmail.comSigned-off-by:
Andy Shevchenko <andy.shevchenko@gmail.com> Cc: Alexey Klimov <aklimov@redhat.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: David Sterba <dsterba@suse.com> Cc: Dennis Zhou <dennis@kernel.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Jianpeng Ma <jianpeng.ma@intel.com> Cc: Joe Perches <joe@perches.com> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Rich Felker <dalias@libc.org> Cc: Stefano Brivio <sbrivio@redhat.com> Cc: Wei Yang <richard.weiyang@linux.alibaba.com> Cc: Wolfram Sang <wsa+renesas@sang-engineering.com> Cc: Yoshinori Sato <ysato@users.osdn.me> Signed-off-by:
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Yury Norov authored
Similarly to bitmap functions, find_next_*_bit() users will benefit if we'll handle a case of bitmaps that fit into a single word inline. In the very best case, the compiler may replace a function call with a few instructions. This is the quite typical find_next_bit() user: unsigned int cpumask_next(int n, const struct cpumask *srcp) { /* -1 is a legal arg here. */ if (n != -1) cpumask_check(n); return find_next_bit(cpumask_bits(srcp), nr_cpumask_bits, n + 1); } EXPORT_SYMBOL(cpumask_next); Currently, on ARM64 the generated code looks like this: 0000000000000000 <cpumask_next>: 0: a9bf7bfd stp x29, x30, [sp, #-16]! 4: 11000402 add w2, w0, #0x1 8: aa0103e0 mov x0, x1 c: d2800401 mov x1, #0x40 // #64 10: 910003fd mov x29, sp 14: 93407c42 sxtw x2, w2 18: 94000000 bl 0 <find_next_bit> 1c: a8c17bfd ldp x29, x30, [sp], #16 20: d65f03c0 ret 24: d503201f nop After applying this patch: 0000000000000140 <cpumask_next>: 140: 11000400 add w0, w0, #0x1 144: 93407c00 sxtw x0, w0 148: f100fc1f cmp x0, #0x3f 14c: 54000168 b.hi 178 <cpumask_next+0x38> // b.pmore 150: f9400023 ldr x3, [x1] 154: 92800001 mov x1, #0xffffffffffffffff // #-1 158: 9ac02020 lsl x0, x1, x0 15c: 52800802 mov w2, #0x40 // #64 160: 8a030001 and x1, x0, x3 164: dac00020 rbit x0, x1 168: f100003f cmp x1, #0x0 16c: dac01000 clz x0, x0 170: 1a800040 csel w0, w2, w0, eq // eq = none 174: d65f03c0 ret 178: 52800800 mov w0, #0x40 // #64 17c: d65f03c0 ret find_next_bit() call is replaced with 6 instructions. find_next_bit() itself is 41 instructions plus function call overhead. Despite inlining, the scripts/bloat-o-meter report smaller .text size after applying the series: add/remove: 11/9 grow/shrink: 233/176 up/down: 5780/-6768 (-988) Link: https://lkml.kernel.org/r/20210401003153.97325-10-yury.norov@gmail.comSigned-off-by: -
Yury Norov authored
Sync the implementation with recent kernel changes. Link: https://lkml.kernel.org/r/20210401003153.97325-9-yury.norov@gmail.comSigned-off-by:
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Yury Norov authored
lib/find_bit.c declares five single-line wrappers for _find_next_bit(). We may turn those wrappers to inline functions. It eliminates unneeded function calls and opens room for compile-time optimizations. Link: https://lkml.kernel.org/r/20210401003153.97325-8-yury.norov@gmail.comSigned-off-by:
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Yury Norov authored
Sync implementation with the kernel and move the macro from tools/include/linux/bitmap.h to tools/include/asm-generic/bitsperlong.h Link: https://lkml.kernel.org/r/20210401003153.97325-7-yury.norov@gmail.comSigned-off-by:
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Yury Norov authored
find_bit would also benefit from small_const_nbits() optimizations. The detailed comment is provided by Rasmus Villemoes. Link: https://lkml.kernel.org/r/20210401003153.97325-6-yury.norov@gmail.comSuggested-by:
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Yury Norov authored
m68k and sh include bitmap/{find,le}.h prior to ffs/fls headers. New fast-path implementation in find.h requires ffs/fls. Reordering the headers inclusion sequence helps to prevent compile-time implicit function declaration error. [yury.norov@gmail.com: h8300: rearrange headers inclusion order in asm/bitops] Link: https://lkml.kernel.org/r/20210406183625.794227-1-yury.norov@gmail.com Link: https://lkml.kernel.org/r/20210401003153.97325-5-yury.norov@gmail.comSigned-off-by:Geert Uytterhoeven <geert@linux-m68k.org> Acked-by:
Guenter Roeck <linux@roeck-us.net> Cc: Alexey Klimov <aklimov@redhat.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: David Sterba <dsterba@suse.com> Cc: Dennis Zhou <dennis@kernel.org> Cc: Jianpeng Ma <jianpeng.ma@intel.com> Cc: Joe Perches <joe@perches.com> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Rich Felker <dalias@libc.org> Cc: Stefano Brivio <sbrivio@redhat.com> Cc: Wei Yang <richard.weiyang@linux.alibaba.com> Cc: Wolfram Sang <wsa+renesas@sang-engineering.com> Cc: Yoshinori Sato <ysato@users.osdn.me> Signed-off-by:
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Yury Norov authored
Kernel version generates better code. Link: https://lkml.kernel.org/r/20210401003153.97325-4-yury.norov@gmail.comSigned-off-by:
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Yury Norov authored
Some functions in tools/include/linux/bitmap.h declare nbits as int. In the kernel nbits is declared as unsigned int. Link: https://lkml.kernel.org/r/20210401003153.97325-3-yury.norov@gmail.comSigned-off-by:
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Yury Norov authored
Patch series "lib/find_bit: fast path for small bitmaps", v6. Bitmap operations are much simpler and faster in case of small bitmaps which fit into a single word. In linux/bitmap.c we have a machinery that allows compiler to replace actual function call with a few instructions if bitmaps passed into the function are small and their size is known at compile time. find_*_bit() API lacks this functionality; but users will benefit from it a lot. One important example is cpumask subsystem when NR_CPUS <= BITS_PER_LONG. This patch (of 12): GENMASK(h, l) may be passed with unsigned types. In such case, type-limits warning is generated for example in case of GENMASK(h, 0). Link: https://lkml.kernel.org/r/20210401003153.97325-1-yury.norov@gmail.com Link: https://lkml.kernel.org/r/20210401003153.97325-2-yury.norov@gmail.comSigned-off-by:
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Rasmus Villemoes authored
init_groups is declared in both cred.h and init_task.h, but it is not actually referenced anywhere outside of cred.c where it is defined. So make it static and remove the declarations. Link: https://lkml.kernel.org/r/20210310220102.2484201-1-linux@rasmusvillemoes.dkSigned-off-by:
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Rasmus Villemoes authored
An async_func_t returns void - any errors encountered it has to stash somewhere for consumers to discover later. Link: https://lkml.kernel.org/r/20210226124355.2503524-1-linux@rasmusvillemoes.dkSigned-off-by:
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Wan Jiabing authored
Declaring struct pt_regs is unnecessary. On the one hand, there is no function using it; on the other hand, struct pt_regs has been declared in linux/kernel.h. Remove them. Link: https://lkml.kernel.org/r/20210401104834.1009157-1-wanjiabing@vivo.comSigned-off-by:
Wan Jiabing <wanjiabing@vivo.com> Signed-off-by:
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Andy Shevchenko authored
The bitmap.h header is used in a lot of code around the kernel. Besides that it includes kernel.h which sometimes makes a loop. The problem here is many unneeded loops that make header hell dependencies. For example, how may you move bitmap_zalloc() from C-file to the header? Currently it's impossible. And bitmap.h here is only the tip of an iceberg. kerne.h is a dump of everything that even has nothing in common at all. We may still have it, but in my new code I prefer to include only the headers that I want to use, without the bulk of unneeded kernel code. Break the loop by introducing align.h, including it in kernel.h and bitmap.h followed by replacing kernel.h with limits.h. Link: https://lkml.kernel.org/r/20210326170347.37441-1-andriy.shevchenko@linux.intel.comSigned-off-by:
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Matthew Wilcox (Oracle) authored
My UEK-derived config has 1030 files depending on pagemap.h before this change. Afterwards, just 326 files need to be rebuilt when I touch pagemap.h. I think blkdev.h is probably included too widely, but untangling that dependency is harder and this solves my problem. x86 allmodconfig builds, but there may be implicit include problems on other architectures. Link: https://lkml.kernel.org/r/20210309195747.283796-1-willy@infradead.orgSigned-off-by:
Matthew Wilcox (Oracle) <willy@infradead.org> Acked-by: Dan Williams <dan.j.williams@intel.com> [nvdimm] Acked-by: Jens Axboe <axboe@kernel.dk> [block] Reviewed-by:
Christoph Hellwig <hch@lst.de> Acked-by: Coly Li <colyli@suse.de> [bcache] Acked-by: Martin K. Petersen <martin.petersen@oracle.com> [scsi] Reviewed-by:
William Kucharski <william.kucharski@oracle.com> Signed-off-by:
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zhouchuangao authored
The function name should be modified to register_sysctl_paths instead of register_sysctl_table_path. Link: https://lkml.kernel.org/r/1615807194-79646-1-git-send-email-zhouchuangao@vivo.comSigned-off-by:
zhouchuangao <zhouchuangao@vivo.com> Signed-off-by:
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Alexey Dobriyan authored
Test that /proc instance mounted with mount -t proc -o subset=pid contains only ".", "..", "self", "thread-self" and pid directories. Note: Currently "subset=pid" doesn't return "." and ".." via readdir. This must be a bug. Link: https://lkml.kernel.org/r/YFYZZ7WGaZlsnChS@localhost.localdomainSigned-off-by:
Alexey Dobriyan <adobriyan@gmail.com> Acked-by:
Alexey Gladkov <gladkov.alexey@gmail.com> Signed-off-by:
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Alexey Dobriyan authored
Two checks in lookup and readdir code should be enough to not have third check in open code. Can't open what can't be looked up? Link: https://lkml.kernel.org/r/YFYYwIBIkytqnkxP@localhost.localdomainSigned-off-by:
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Alexey Dobriyan authored
Now that proc_ops are separate from file_operations and other operations it easy to check all instances to have ->proc_lseek hook and remove check in main code. Note: nonseekable_open() files naturally don't require ->proc_lseek. Garbage collect pde_lseek() function. [adobriyan@gmail.com: smoke test lseek()] Link: https://lkml.kernel.org/r/YG4OIhChOrVTPgdN@localhost.localdomain Link: https://lkml.kernel.org/r/YFYX0Bzwxlc7aBa/@localhost.localdomainSigned-off-by:
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Alexey Dobriyan authored
Can't look at this verbosity anymore. Link: https://lkml.kernel.org/r/YFYXAp/fgq405qcy@localhost.localdomainSigned-off-by:
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Colin Ian King authored
Currently the pde_is_permanent() check is being run on root multiple times rather than on the next proc directory entry. This looks like a copy-paste error. Fix this by replacing root with next. Addresses-Coverity: ("Copy-paste error") Link: https://lkml.kernel.org/r/20210318122633.14222-1-colin.king@canonical.com Fixes: d919b33d ("proc: faster open/read/close with "permanent" files") Signed-off-by:Colin Ian King <colin.king@canonical.com> Acked-by:
Christian Brauner <christian.brauner@ubuntu.com> Reviewed-by:
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Randy Dunlap authored
Fix "no previous prototype" W=1 warnings from the kernel test robot: arch/alpha/lib/csum_partial_copy.c:349:1: error: no previous prototype for 'csum_and_copy_from_user' [-Werror=missing-prototypes] 349 | csum_and_copy_from_user(const void __user *src, void *dst, int len) | ^~~~~~~~~~~~~~~~~~~~~~~ arch/alpha/lib/csum_partial_copy.c:358:1: error: no previous prototype for 'csum_partial_copy_nocheck' [-Werror=missing-prototypes] 358 | csum_partial_copy_nocheck(const void *src, void *dst, int len) | ^~~~~~~~~~~~~~~~~~~~~~~~~ Link: https://lkml.kernel.org/r/20210425235749.19113-1-rdunlap@infradead.org Fixes: 808b49da ("alpha: turn csum_partial_copy_from_user() into csum_and_copy_from_user()") Signed-off-by:kernel test robot <lkp@intel.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Signed-off-by:
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Randy Dunlap authored
'make ARCH=alpha W=1' reports a couple of old-style function definitions with missing parameter list, so fix those. arch/alpha/kernel/pc873xx.c: In function 'pc873xx_get_base': arch/alpha/kernel/pc873xx.c:16:21: warning: old-style function definition [-Wold-style-definition] 16 | unsigned int __init pc873xx_get_base() arch/alpha/kernel/pc873xx.c: In function 'pc873xx_get_model': arch/alpha/kernel/pc873xx.c:21:14: warning: old-style function definition [-Wold-style-definition] 21 | char *__init pc873xx_get_model() Link: https://lkml.kernel.org/r/20210421061312.30097-1-rdunlap@infradead.orgSigned-off-by:
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- 05 May, 2021 1 commit
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Marco Elver authored
Use the power-efficient work queue, to avoid the pathological case where we keep pinning ourselves on the same possibly idle CPU on systems that want to be power-efficient (https://lwn.net/Articles/731052/). Link: https://lkml.kernel.org/r/20210421105132.3965998-4-elver@google.comSigned-off-by:
Marco Elver <elver@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Hillf Danton <hdanton@sina.com> Cc: Jann Horn <jannh@google.com> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by:
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