| From | Miaohe Lin <> | Subject | [PATCH 09/15] mm/swap: avoid calling swp_swap_info when try to check SWP_STABLE_WRITES | Date | Mon, 9 May 2022 21:14:10 +0800 |
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Use flags of si directly to check SWP_STABLE_WRITES to avoid possible READ_ONCE and thus save some cpu cycles.
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> --- mm/memory.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/memory.c b/mm/memory.c index 9c3e7e6ac202..89dd15504f3d 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3892,7 +3892,7 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) */ exclusive = true; } else if (exclusive && PageWriteback(page) && - (swp_swap_info(entry)->flags & SWP_STABLE_WRITES)) { + (si->flags & SWP_STABLE_WRITES)) { /* * This is tricky: not all swap backends support * concurrent page modifications while under writeback. -- 2.23.0
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