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mm/swap_state: skip meaningless swap cache readahead when ra_info.win == 0 

swap_ra_info() may leave ra_info untouched in non_swap_entry() case as
page table lock is not held.  In this case, we have ra_info.nr_pte == 0
and it is meaningless to continue with swap cache readahead.  Skip such
ops by init ra_info.win = 1.

[akpm@linux-foundation.org: clean up struct init]

Link: https://lkml.kernel.org/r/20201009133059.58407-1-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2020-12-14 19:06:01 -08:00 committed by Linus Torvalds
parent d8aa24e04f
commit e97af69950
1 changed files with 3 additions and 1 deletions
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4
mm/swap_state.c
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@ -839,7 +839,9 @@ static struct page *swap_vma_readahead(swp_entry_t fentry, gfp_t gfp_mask,
swp_entry_t entry;
unsigned int i;
bool page_allocated;
struct vma_swap_readahead ra_info = {0,};
struct vma_swap_readahead ra_info = {
.win = 1,
};
swap_ra_info(vmf, &ra_info);
if (ra_info.win == 1)