The patch titled
Subject: mm/memory-failure.c: avoid walking page table when vma_address() return -EFAULT
has been added to the -mm tree. Its filename is
mm-memory-failurec-avoid-walking-page-table-when-vma_address-return-efault.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-memory-failurec-avoid-walking-page-table-when-vma_address-return-efault.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-memory-failurec-avoid-walking-page-table-when-vma_address-return-efault.patch
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------------------------------------------------------
From: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Subject: mm/memory-failure.c: avoid walking page table when vma_address() return -EFAULT
It's unnecessary to walk the page table when vma_address() return -EFAULT.
Return early if so to save some cpu cycles.
Link: https://lkml.kernel.org/r/20220210141733.1908-3-linmiaohe@xxxxxxxxxx
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/mm/memory-failure.c~mm-memory-failurec-avoid-walking-page-table-when-vma_address-return-efault
+++ a/mm/memory-failure.c
@@ -315,6 +315,8 @@ static unsigned long dev_pagemap_mapping
pmd_t *pmd;
pte_t *pte;
+ if (address == -EFAULT)
+ return 0;
pgd = pgd_offset(vma->vm_mm, address);
if (!pgd_present(*pgd))
return 0;
_
Patches currently in -mm which might be from linmiaohe@xxxxxxxxxx are
mm-memremap-avoid-calling-kasan_remove_zero_shadow-for-device-private-memory.patch
filemap-remove-find_get_pages.patch
mm-sparse-make-mminit_validate_memmodel_limits-static.patch
mm-vmalloc-remove-unneeded-function-forward-declaration.patch
mm-mmzoneh-remove-unused-macros.patch
mm-memory-failurec-minor-clean-up-for-memory_failure_dev_pagemap.patch
mm-memory-failurec-avoid-walking-page-table-when-vma_address-return-efault.patch
mm-memory-failurec-rework-the-signaling-logic-in-kill_proc.patch
mm-memory-failurec-remove-unneeded-orig_head.patch
mm-memory-failurec-remove-pageslab-check-in-hwpoison_filter_dev.patch
mm-memory-failurec-rework-the-try_to_unmap-logic-in-hwpoison_user_mappings.patch
mm-memory-failurec-remove-obsolete-comment-in-__soft_offline_page.patch
mm-memory-failurec-remove-unnecessary-pagetranstail-check.patch
mm-balloon_compaction-make-balloon-page-compaction-callbacks-static.patch
mm-memory_hotplug-remove-obsolete-comment-of-__add_pages.patch
mm-memory_hotplug-avoid-calling-zone_intersects-for-zone_normal.patch
mm-memory_hotplug-clean-up-try_offline_node.patch
mm-memory_hotplug-fix-misplaced-comment-in-offline_pages.patch
mm-highmem-remove-unnecessary-done-label.patch
mm-hmmc-remove-unneeded-local-variable-ret.patch
