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28 lines
957 B
Diff
28 lines
957 B
Diff
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From 536f2097dc397e4ebd0566e8f00219c02d7c8073 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Thu, 12 Sep 2024 10:06:50 +0100
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Subject: [PATCH 1261/1350] mm/vmscan: Maintain TLB coherency in LRU code
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As a workaround (and possibly a fix) for CPU spins observed on BCM2837,
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use ptep_clear_flush_young instead of ptep_test_and_clear_young inside
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lru_gen_look_around in order to expose PTE changes to the MMU. Note that
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on architectures that don't require an explicit flush,
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ptep_clear_flush_young just calls ptep_test_and_clear_young.
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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mm/vmscan.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/mm/vmscan.c
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+++ b/mm/vmscan.c
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@@ -4716,7 +4716,7 @@ void lru_gen_look_around(struct page_vma
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if (!folio)
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continue;
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- if (!ptep_test_and_clear_young(vma, addr, pte + i))
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+ if (!ptep_clear_flush_young(vma, addr, pte + i))
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VM_WARN_ON_ONCE(true);
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young++;
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