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- From 536f2097dc397e4ebd0566e8f00219c02d7c8073 Mon Sep 17 00:00:00 2001
- From: Phil Elwell <[email protected]>
- Date: Thu, 12 Sep 2024 10:06:50 +0100
- Subject: [PATCH 1261/1350] mm/vmscan: Maintain TLB coherency in LRU code
- As a workaround (and possibly a fix) for CPU spins observed on BCM2837,
- use ptep_clear_flush_young instead of ptep_test_and_clear_young inside
- lru_gen_look_around in order to expose PTE changes to the MMU. Note that
- on architectures that don't require an explicit flush,
- ptep_clear_flush_young just calls ptep_test_and_clear_young.
- Signed-off-by: Phil Elwell <[email protected]>
- ---
- mm/vmscan.c | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
- --- a/mm/vmscan.c
- +++ b/mm/vmscan.c
- @@ -4723,7 +4723,7 @@ void lru_gen_look_around(struct page_vma
- if (!folio)
- continue;
-
- - if (!ptep_test_and_clear_young(vma, addr, pte + i))
- + if (!ptep_clear_flush_young(vma, addr, pte + i))
- VM_WARN_ON_ONCE(true);
-
- young++;
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