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mm/huge_memory: mark racy access onhuge_anon_orders_always

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huge_anon_orders_always is accessed lockless, it is better to use the
READ_ONCE() wrapper.  This is not fixing any visible bug, hopefully this
can cease some KCSAN complains in the future.  Also do that for
huge_anon_orders_madvise.

Link: https://lkml.kernel.org/r/20240515104754889HqrahFPePOIE1UlANHVAh@zte.com.cn
Signed-off-by: Ran Xiaokai <ran.xiaokai@zte.com.cn>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Lu Zhongjun <lu.zhongjun@zte.com.cn>
Reviewed-by: xu xin <xu.xin16@zte.com.cn>
Cc: Yang Yang <yang.yang29@zte.com.cn>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Ran Xiaokai 2024-05-15 10:47:54 +08:00 committed by Andrew Morton
parent 6f775463d0
commit 7f83bf1460
1 changed files with 2 additions and 2 deletions
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4
include/linux/huge_mm.h
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@ -134,8 +134,8 @@ static inline bool hugepage_flags_enabled(void)
* So we don't need to look at huge_anon_orders_inherit.
*/
return hugepage_global_enabled() ||
huge_anon_orders_always ||
huge_anon_orders_madvise;
READ_ONCE(huge_anon_orders_always) ||
READ_ONCE(huge_anon_orders_madvise);
}
static inline int highest_order(unsigned long orders)