Commit de2e5171 authored by Kefeng Wang's avatar Kefeng Wang Committed by Andrew Morton
Browse files

mm: add cond_resched() in swapin_walk_pmd_entry() 

When handling MADV_WILLNEED in madvise(), a soflockup may occurr in
swapin_walk_pmd_entry() if swapping in lots of memory on a slow device. 
Add a cond_resched() to avoid the possible softlockup.

Link: https://lkml.kernel.org/r/20221205140327.72304-1-wangkefeng.wang@huawei.com


Fixes: 1998cc04 ("mm: make madvise(MADV_WILLNEED) support swap file prefetch")
Signed-off-by: default avatarKefeng Wang <wangkefeng.wang@huawei.com>
Cc: Shaohua Li <shli@fusionio.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 8614d6c5

mm/madvise.c

+1 −0
Original line number Diff line number Diff line
@@ -223,6 +223,7 @@ static int swapin_walk_pmd_entry(pmd_t *pmd, unsigned long start, 
			put_page(page);

	}

	swap_read_unplug(splug);

	cond_resched();



	return 0;

}