The patch titled
Subject: mm, hwpoison: remove recalculating hpage
has been added to the -mm tree. Its filename is
mm-hwpoison-remove-recalculating-hpage.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-hwpoison-remove-recalculating-hpage.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-hwpoison-remove-recalculating-hpage.patch
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------------------------------------------------------
From: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
Subject: mm, hwpoison: remove recalculating hpage
hpage is never used after try_to_split_thp_page() in memory_failure(), so
we don't have to update hpage. So let's not recalculate/use hpage.
Link: http://lkml.kernel.org/r/20200716123810.25292-3-osalvador@xxxxxxx
Signed-off-by: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
Signed-off-by: Oscar Salvador <osalvador@xxxxxxxx>
Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Dmitry Yakunin <zeil@xxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory-failure.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)
--- a/mm/memory-failure.c~mm-hwpoison-remove-recalculating-hpage
+++ a/mm/memory-failure.c
@@ -1342,7 +1342,6 @@ int memory_failure(unsigned long pfn, in
}
unlock_page(p);
VM_BUG_ON_PAGE(!page_count(p), p);
- hpage = compound_head(p);
}
/*
@@ -1414,11 +1413,8 @@ int memory_failure(unsigned long pfn, in
/*
* Now take care of user space mappings.
* Abort on fail: __delete_from_page_cache() assumes unmapped page.
- *
- * When the raw error page is thp tail page, hpage points to the raw
- * page after thp split.
*/
- if (!hwpoison_user_mappings(p, pfn, flags, &hpage)) {
+ if (!hwpoison_user_mappings(p, pfn, flags, &p)) {
action_result(pfn, MF_MSG_UNMAP_FAILED, MF_IGNORED);
res = -EBUSY;
goto out;
_
Patches currently in -mm which might be from naoya.horiguchi@xxxxxxx are
mm-hwpoison-remove-recalculating-hpage.patch
