mm/swapfile: mark racy access on si->highest_bit

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In scan_swap_map_slots(), si->highest_bit can by changed by
swap_range_alloc() concurrently.  All reads on si->highest_bit except one
is either protected by lock or read using READ_ONCE.  So mark the one racy
read on si->highest_bit as benign using READ_ONCE.

This patch is aimed at reducing the number of benign races reported by
KCSAN in order to focus future debugging effort on harmful races.

Link: https://lkml.kernel.org/r/tencent_912BC3E8B0291DA4A0028AB424076375DA07@qq.com
Signed-off-by: linke li <lilinke99@qq.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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linke li 2024-04-27 14:29:56 +08:00 • committed by Andrew Morton

parent 637a900b08

commit 5ee9562c58

1 changed files with 1 additions and 1 deletions

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mm/swapfile.c

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