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Message-ID: <202012032217.g0RdkfWh-lkp@intel.com>
Date: Thu, 3 Dec 2020 22:30:44 +0800
From: kernel test robot <lkp@...el.com>
To: unlisted-recipients:; (no To-header on input)
Cc: kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
linux-kernel@...r.kernel.org, x86@...nel.org,
Ingo Molnar <mingo@...nel.org>
Subject: [tip:perf/kprobes 24/25] include/linux/freelist.h:52:8: warning:
converting the result of '<<' to a boolean always evaluates to true
tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf/kprobes
head: a70a04b3844f59c29573a8581d5c263225060dd6
commit: 666fab4a3ea143315a9c059fad9f3a0f1365d54b [24/25] Merge branch 'linus' into perf/kprobes
config: mips-randconfig-r021-20201203 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 32c501dd88b62787d3a5ffda7aabcf4650dbe3cd)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install mips cross compiling tool for clang build
# apt-get install binutils-mips-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=666fab4a3ea143315a9c059fad9f3a0f1365d54b
git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
git fetch --no-tags tip perf/kprobes
git checkout 666fab4a3ea143315a9c059fad9f3a0f1365d54b
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
In file included from include/linux/smp.h:13:
In file included from include/linux/cpumask.h:13:
In file included from include/linux/atomic.h:7:
arch/mips/include/asm/atomic.h:257:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
ATOMIC_SIP_OP(atomic, int, subu, ll, sc)
^
arch/mips/include/asm/atomic.h:251:7: note: expanded from macro 'ATOMIC_SIP_OP'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/video/fbdev/s1d13xxxfb.c:24:
In file included from include/linux/module.h:13:
In file included from include/linux/stat.h:19:
In file included from include/linux/time.h:73:
In file included from include/linux/time32.h:13:
In file included from include/linux/timex.h:65:
In file included from arch/mips/include/asm/timex.h:19:
In file included from arch/mips/include/asm/cpu-type.h:12:
In file included from include/linux/smp.h:13:
In file included from include/linux/cpumask.h:13:
In file included from include/linux/atomic.h:7:
arch/mips/include/asm/atomic.h:261:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
ATOMIC_SIP_OP(atomic64, s64, dsubu, lld, scd)
^
arch/mips/include/asm/atomic.h:251:7: note: expanded from macro 'ATOMIC_SIP_OP'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/video/fbdev/s1d13xxxfb.c:24:
In file included from include/linux/module.h:13:
In file included from include/linux/stat.h:19:
In file included from include/linux/time.h:73:
In file included from include/linux/time32.h:13:
In file included from include/linux/timex.h:65:
In file included from arch/mips/include/asm/timex.h:19:
In file included from arch/mips/include/asm/cpu-type.h:12:
In file included from include/linux/smp.h:15:
In file included from include/linux/smp_types.h:5:
include/linux/llist.h:237:9: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
return xchg(&head->first, NULL);
^
arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/video/fbdev/s1d13xxxfb.c:24:
In file included from include/linux/module.h:16:
In file included from include/linux/kmod.h:9:
In file included from include/linux/umh.h:4:
In file included from include/linux/gfp.h:6:
In file included from include/linux/mmzone.h:16:
In file included from include/linux/seqlock.h:19:
In file included from include/linux/mutex.h:21:
include/linux/debug_locks.h:17:9: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
return xchg(&debug_locks, 0);
^
arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/video/fbdev/s1d13xxxfb.c:29:
In file included from include/linux/mm.h:33:
In file included from include/linux/pgtable.h:6:
arch/mips/include/asm/pgtable.h:208:3: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
cmpxchg64(&buddy->pte, 0, _PAGE_GLOBAL);
^
arch/mips/include/asm/cmpxchg.h:220:2: note: expanded from macro 'cmpxchg64'
cmpxchg((ptr), (o), (n)); \
^
arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/video/fbdev/s1d13xxxfb.c:29:
In file included from include/linux/mm.h:33:
In file included from include/linux/pgtable.h:6:
arch/mips/include/asm/pgtable.h:208:3: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
arch/mips/include/asm/cmpxchg.h:220:2: note: expanded from macro 'cmpxchg64'
cmpxchg((ptr), (o), (n)); \
^
arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/video/fbdev/s1d13xxxfb.c:31:
In file included from include/linux/fb.h:5:
In file included from include/linux/kgdb.h:19:
In file included from include/linux/kprobes.h:31:
>> include/linux/freelist.h:52:8: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
if (!try_cmpxchg_release(&list->head, &head, node)) {
^
include/linux/atomic-fallback.h:113:9: note: expanded from macro 'try_cmpxchg_release'
___r = cmpxchg_release((_ptr), ___o, (_new)); \
^
include/linux/atomic-fallback.h:36:25: note: expanded from macro 'cmpxchg_release'
#define cmpxchg_release cmpxchg
^
arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/video/fbdev/s1d13xxxfb.c:31:
In file included from include/linux/fb.h:5:
In file included from include/linux/kgdb.h:19:
In file included from include/linux/kprobes.h:31:
>> include/linux/freelist.h:52:8: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
include/linux/atomic-fallback.h:113:9: note: expanded from macro 'try_cmpxchg_release'
___r = cmpxchg_release((_ptr), ___o, (_new)); \
^
include/linux/atomic-fallback.h:36:25: note: expanded from macro 'cmpxchg_release'
#define cmpxchg_release cmpxchg
^
arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/video/fbdev/s1d13xxxfb.c:31:
In file included from include/linux/fb.h:5:
In file included from include/linux/kgdb.h:19:
In file included from include/linux/kprobes.h:31:
include/linux/freelist.h:99:7: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
if (try_cmpxchg_acquire(&list->head, &head, next)) {
^
include/linux/atomic-fallback.h:102:9: note: expanded from macro 'try_cmpxchg_acquire'
___r = cmpxchg_acquire((_ptr), ___o, (_new)); \
^
include/linux/atomic-fallback.h:35:25: note: expanded from macro 'cmpxchg_acquire'
#define cmpxchg_acquire cmpxchg
^
arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/video/fbdev/s1d13xxxfb.c:31:
In file included from include/linux/fb.h:5:
In file included from include/linux/kgdb.h:19:
In file included from include/linux/kprobes.h:31:
include/linux/freelist.h:99:7: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
include/linux/atomic-fallback.h:102:9: note: expanded from macro 'try_cmpxchg_acquire'
___r = cmpxchg_acquire((_ptr), ___o, (_new)); \
^
include/linux/atomic-fallback.h:35:25: note: expanded from macro 'cmpxchg_acquire'
#define cmpxchg_acquire cmpxchg
^
arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
16 warnings generated.
--
In file included from include/linux/smp.h:13:
In file included from include/linux/cpumask.h:13:
In file included from include/linux/atomic.h:7:
arch/mips/include/asm/atomic.h:257:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
ATOMIC_SIP_OP(atomic, int, subu, ll, sc)
^
arch/mips/include/asm/atomic.h:251:7: note: expanded from macro 'ATOMIC_SIP_OP'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/video/fbdev/core/fbmem.c:14:
In file included from include/linux/module.h:13:
In file included from include/linux/stat.h:19:
In file included from include/linux/time.h:73:
In file included from include/linux/time32.h:13:
In file included from include/linux/timex.h:65:
In file included from arch/mips/include/asm/timex.h:19:
In file included from arch/mips/include/asm/cpu-type.h:12:
In file included from include/linux/smp.h:13:
In file included from include/linux/cpumask.h:13:
In file included from include/linux/atomic.h:7:
arch/mips/include/asm/atomic.h:261:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
ATOMIC_SIP_OP(atomic64, s64, dsubu, lld, scd)
^
arch/mips/include/asm/atomic.h:251:7: note: expanded from macro 'ATOMIC_SIP_OP'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/video/fbdev/core/fbmem.c:14:
In file included from include/linux/module.h:13:
In file included from include/linux/stat.h:19:
In file included from include/linux/time.h:73:
In file included from include/linux/time32.h:13:
In file included from include/linux/timex.h:65:
In file included from arch/mips/include/asm/timex.h:19:
In file included from arch/mips/include/asm/cpu-type.h:12:
In file included from include/linux/smp.h:15:
In file included from include/linux/smp_types.h:5:
include/linux/llist.h:237:9: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
return xchg(&head->first, NULL);
^
arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/video/fbdev/core/fbmem.c:14:
In file included from include/linux/module.h:16:
In file included from include/linux/kmod.h:9:
In file included from include/linux/umh.h:4:
In file included from include/linux/gfp.h:6:
In file included from include/linux/mmzone.h:16:
In file included from include/linux/seqlock.h:19:
In file included from include/linux/mutex.h:21:
include/linux/debug_locks.h:17:9: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
return xchg(&debug_locks, 0);
^
arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/video/fbdev/core/fbmem.c:22:
In file included from include/linux/mm.h:33:
In file included from include/linux/pgtable.h:6:
arch/mips/include/asm/pgtable.h:208:3: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
cmpxchg64(&buddy->pte, 0, _PAGE_GLOBAL);
^
arch/mips/include/asm/cmpxchg.h:220:2: note: expanded from macro 'cmpxchg64'
cmpxchg((ptr), (o), (n)); \
^
arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/video/fbdev/core/fbmem.c:22:
In file included from include/linux/mm.h:33:
In file included from include/linux/pgtable.h:6:
arch/mips/include/asm/pgtable.h:208:3: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
arch/mips/include/asm/cmpxchg.h:220:2: note: expanded from macro 'cmpxchg64'
cmpxchg((ptr), (o), (n)); \
^
arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/video/fbdev/core/fbmem.c:34:
In file included from include/linux/fb.h:5:
In file included from include/linux/kgdb.h:19:
In file included from include/linux/kprobes.h:31:
>> include/linux/freelist.h:52:8: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
if (!try_cmpxchg_release(&list->head, &head, node)) {
^
include/linux/atomic-fallback.h:113:9: note: expanded from macro 'try_cmpxchg_release'
___r = cmpxchg_release((_ptr), ___o, (_new)); \
^
include/linux/atomic-fallback.h:36:25: note: expanded from macro 'cmpxchg_release'
#define cmpxchg_release cmpxchg
^
arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/video/fbdev/core/fbmem.c:34:
In file included from include/linux/fb.h:5:
In file included from include/linux/kgdb.h:19:
In file included from include/linux/kprobes.h:31:
>> include/linux/freelist.h:52:8: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
include/linux/atomic-fallback.h:113:9: note: expanded from macro 'try_cmpxchg_release'
___r = cmpxchg_release((_ptr), ___o, (_new)); \
^
include/linux/atomic-fallback.h:36:25: note: expanded from macro 'cmpxchg_release'
#define cmpxchg_release cmpxchg
^
arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/video/fbdev/core/fbmem.c:34:
In file included from include/linux/fb.h:5:
In file included from include/linux/kgdb.h:19:
In file included from include/linux/kprobes.h:31:
include/linux/freelist.h:99:7: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
if (try_cmpxchg_acquire(&list->head, &head, next)) {
^
include/linux/atomic-fallback.h:102:9: note: expanded from macro 'try_cmpxchg_acquire'
___r = cmpxchg_acquire((_ptr), ___o, (_new)); \
^
include/linux/atomic-fallback.h:35:25: note: expanded from macro 'cmpxchg_acquire'
#define cmpxchg_acquire cmpxchg
^
arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from drivers/video/fbdev/core/fbmem.c:34:
In file included from include/linux/fb.h:5:
In file included from include/linux/kgdb.h:19:
In file included from include/linux/kprobes.h:31:
include/linux/freelist.h:99:7: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
include/linux/atomic-fallback.h:102:9: note: expanded from macro 'try_cmpxchg_acquire'
___r = cmpxchg_acquire((_ptr), ___o, (_new)); \
^
include/linux/atomic-fallback.h:35:25: note: expanded from macro 'cmpxchg_acquire'
#define cmpxchg_acquire cmpxchg
^
arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
drivers/video/fbdev/core/fbmem.c:736:36: warning: unused variable 'proc_fb_seq_ops' [-Wunused-const-variable]
static const struct seq_operations proc_fb_seq_ops = {
^
17 warnings generated.
vim +52 include/linux/freelist.h
e563604a5f5a891 Peter Zijlstra 2020-08-29 29
e563604a5f5a891 Peter Zijlstra 2020-08-29 30 static inline void __freelist_add(struct freelist_node *node, struct freelist_head *list)
e563604a5f5a891 Peter Zijlstra 2020-08-29 31 {
e563604a5f5a891 Peter Zijlstra 2020-08-29 32 /*
e563604a5f5a891 Peter Zijlstra 2020-08-29 33 * Since the refcount is zero, and nobody can increase it once it's
e563604a5f5a891 Peter Zijlstra 2020-08-29 34 * zero (except us, and we run only one copy of this method per node at
e563604a5f5a891 Peter Zijlstra 2020-08-29 35 * a time, i.e. the single thread case), then we know we can safely
e563604a5f5a891 Peter Zijlstra 2020-08-29 36 * change the next pointer of the node; however, once the refcount is
e563604a5f5a891 Peter Zijlstra 2020-08-29 37 * back above zero, then other threads could increase it (happens under
e563604a5f5a891 Peter Zijlstra 2020-08-29 38 * heavy contention, when the refcount goes to zero in between a load
e563604a5f5a891 Peter Zijlstra 2020-08-29 39 * and a refcount increment of a node in try_get, then back up to
e563604a5f5a891 Peter Zijlstra 2020-08-29 40 * something non-zero, then the refcount increment is done by the other
e563604a5f5a891 Peter Zijlstra 2020-08-29 41 * thread) -- so if the CAS to add the node to the actual list fails,
e563604a5f5a891 Peter Zijlstra 2020-08-29 42 * decrese the refcount and leave the add operation to the next thread
e563604a5f5a891 Peter Zijlstra 2020-08-29 43 * who puts the refcount back to zero (which could be us, hence the
e563604a5f5a891 Peter Zijlstra 2020-08-29 44 * loop).
e563604a5f5a891 Peter Zijlstra 2020-08-29 45 */
e563604a5f5a891 Peter Zijlstra 2020-08-29 46 struct freelist_node *head = READ_ONCE(list->head);
e563604a5f5a891 Peter Zijlstra 2020-08-29 47
e563604a5f5a891 Peter Zijlstra 2020-08-29 48 for (;;) {
e563604a5f5a891 Peter Zijlstra 2020-08-29 49 WRITE_ONCE(node->next, head);
e563604a5f5a891 Peter Zijlstra 2020-08-29 50 atomic_set_release(&node->refs, 1);
e563604a5f5a891 Peter Zijlstra 2020-08-29 51
e563604a5f5a891 Peter Zijlstra 2020-08-29 @52 if (!try_cmpxchg_release(&list->head, &head, node)) {
e563604a5f5a891 Peter Zijlstra 2020-08-29 53 /*
e563604a5f5a891 Peter Zijlstra 2020-08-29 54 * Hmm, the add failed, but we can only try again when
e563604a5f5a891 Peter Zijlstra 2020-08-29 55 * the refcount goes back to zero.
e563604a5f5a891 Peter Zijlstra 2020-08-29 56 */
e563604a5f5a891 Peter Zijlstra 2020-08-29 57 if (atomic_fetch_add_release(REFS_ON_FREELIST - 1, &node->refs) == 1)
e563604a5f5a891 Peter Zijlstra 2020-08-29 58 continue;
e563604a5f5a891 Peter Zijlstra 2020-08-29 59 }
e563604a5f5a891 Peter Zijlstra 2020-08-29 60 return;
e563604a5f5a891 Peter Zijlstra 2020-08-29 61 }
e563604a5f5a891 Peter Zijlstra 2020-08-29 62 }
e563604a5f5a891 Peter Zijlstra 2020-08-29 63
:::::: The code at line 52 was first introduced by commit
:::::: e563604a5f5a891283b6a8db4001cee833a7c6b8 freelist: Implement lockless freelist
:::::: TO: Peter Zijlstra <peterz@...radead.org>
:::::: CC: Ingo Molnar <mingo@...nel.org>
---
0-DAY CI Kernel Test Service, Intel Corporation
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