* Re: [PATCH v1] mm: fix data-race in folio_batch_count()
[not found] <20260624092606.1083449-1-wangxuewen@kylinos.cn>
@ 2026-06-24 14:35 ` kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2026-06-24 14:35 UTC (permalink / raw)
To: Xuewen Wang, akpm, david, ljs, liam, vbabka, rppt, surenb, mhocko
Cc: llvm, oe-kbuild-all, linux-mm, linux-kernel, Xuewen Wang
Hi Xuewen,
kernel test robot noticed the following build errors:
[auto build test ERROR on akpm-mm/mm-everything]
url: https://github.com/intel-lab-lkp/linux/commits/Xuewen-Wang/mm-fix-data-race-in-folio_batch_count/20260624-172724
base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link: https://lore.kernel.org/r/20260624092606.1083449-1-wangxuewen%40kylinos.cn
patch subject: [PATCH v1] mm: fix data-race in folio_batch_count()
config: i386-defconfig (https://download.01.org/0day-ci/archive/20260624/202606242209.fM2W0efm-lkp@intel.com/config)
compiler: clang version 22.1.3 (https://github.com/llvm/llvm-project e9846648fd6183ee6d8cbdb4502213fcf902a211)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260624/202606242209.fM2W0efm-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202606242209.fM2W0efm-lkp@intel.com/
All errors (new ones prefixed by >>):
In file included from drivers/gpu/drm/i915/gem/i915_gem_shmem.c:6:
>> include/linux/folio_batch.h:56:9: error: call to undeclared function 'READ_ONCE'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
56 | return READ_ONCE(fbatch->nr);
| ^
In file included from drivers/gpu/drm/i915/gem/i915_gem_shmem.c:7:
In file included from include/linux/shmem_fs.h:6:
In file included from include/linux/swap.h:9:
In file included from include/linux/memcontrol.h:13:
In file included from include/linux/cgroup.h:17:
In file included from include/linux/fs.h:5:
In file included from include/linux/fs/super.h:5:
In file included from include/linux/fs/super_types.h:13:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:98:11: warning: array index 3 is past the end of the array (that has type 'unsigned long[2]') [-Warray-bounds]
98 | return (set->sig[3] | set->sig[2] |
| ^ ~
arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here
24 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from drivers/gpu/drm/i915/gem/i915_gem_shmem.c:7:
In file included from include/linux/shmem_fs.h:6:
In file included from include/linux/swap.h:9:
In file included from include/linux/memcontrol.h:13:
In file included from include/linux/cgroup.h:17:
In file included from include/linux/fs.h:5:
In file included from include/linux/fs/super.h:5:
In file included from include/linux/fs/super_types.h:13:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:98:25: warning: array index 2 is past the end of the array (that has type 'unsigned long[2]') [-Warray-bounds]
98 | return (set->sig[3] | set->sig[2] |
| ^ ~
arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here
24 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from drivers/gpu/drm/i915/gem/i915_gem_shmem.c:7:
In file included from include/linux/shmem_fs.h:6:
In file included from include/linux/swap.h:9:
In file included from include/linux/memcontrol.h:13:
In file included from include/linux/cgroup.h:17:
In file included from include/linux/fs.h:5:
In file included from include/linux/fs/super.h:5:
In file included from include/linux/fs/super_types.h:13:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:114:11: warning: array index 3 is past the end of the array (that has type 'const unsigned long[2]') [-Warray-bounds]
114 | return (set1->sig[3] == set2->sig[3]) &&
| ^ ~
arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here
24 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from drivers/gpu/drm/i915/gem/i915_gem_shmem.c:7:
In file included from include/linux/shmem_fs.h:6:
In file included from include/linux/swap.h:9:
In file included from include/linux/memcontrol.h:13:
In file included from include/linux/cgroup.h:17:
In file included from include/linux/fs.h:5:
In file included from include/linux/fs/super.h:5:
In file included from include/linux/fs/super_types.h:13:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:114:27: warning: array index 3 is past the end of the array (that has type 'const unsigned long[2]') [-Warray-bounds]
114 | return (set1->sig[3] == set2->sig[3]) &&
| ^ ~
arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here
24 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from drivers/gpu/drm/i915/gem/i915_gem_shmem.c:7:
In file included from include/linux/shmem_fs.h:6:
In file included from include/linux/swap.h:9:
In file included from include/linux/memcontrol.h:13:
In file included from include/linux/cgroup.h:17:
In file included from include/linux/fs.h:5:
In file included from include/linux/fs/super.h:5:
In file included from include/linux/fs/super_types.h:13:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:115:5: warning: array index 2 is past the end of the array (that has type 'const unsigned long[2]') [-Warray-bounds]
115 | (set1->sig[2] == set2->sig[2]) &&
| ^ ~
arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here
24 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from drivers/gpu/drm/i915/gem/i915_gem_shmem.c:7:
In file included from include/linux/shmem_fs.h:6:
In file included from include/linux/swap.h:9:
In file included from include/linux/memcontrol.h:13:
In file included from include/linux/cgroup.h:17:
In file included from include/linux/fs.h:5:
In file included from include/linux/fs/super.h:5:
In file included from include/linux/fs/super_types.h:13:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:115:21: warning: array index 2 is past the end of the array (that has type 'const unsigned long[2]') [-Warray-bounds]
115 | (set1->sig[2] == set2->sig[2]) &&
vim +/READ_ONCE +56 include/linux/folio_batch.h
53
54 static inline unsigned int folio_batch_count(const struct folio_batch *fbatch)
55 {
> 56 return READ_ONCE(fbatch->nr);
57 }
58
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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[not found] <20260624092606.1083449-1-wangxuewen@kylinos.cn>
2026-06-24 14:35 ` [PATCH v1] mm: fix data-race in folio_batch_count() kernel test robot
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