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Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.41 All patches automatically rebased. Build system: x86/64 Build-tested: flogic/xiaomi_redmi-router-ax6000-ubootmod, ramips/tplink_archer-a6-v3, x86/64-glibc Run-tested: flogic/xiaomi_redmi-router-ax6000-ubootmod, ramips/tplink_archer-a6-v3, x86/64-glibc Signed-off-by: John Audia <therealgraysky@proton.me> Link: https://github.com/openwrt/openwrt/pull/19618 Signed-off-by: Robert Marko <robimarko@gmail.com>
28 lines
939 B
Diff
28 lines
939 B
Diff
From 532fc50f78c39fc56c1256ba1b11ec7d45adf214 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] 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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@@ -4136,7 +4136,7 @@ bool lru_gen_look_around(struct page_vma
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if (!folio)
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continue;
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- if (!ptep_clear_young_notify(vma, addr, pte + i))
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+ if (!ptep_clear_flush_young_notify(vma, addr, pte + i))
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continue;
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young++;
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