+ mm-hwpoison-check-the-subpage-not-the-head-page.patch added to -mm tree

+ mm-hwpoison-check-the-subpage-not-the-head-page.patch added to -mm tree

[Andrew Morton]

The patch titled
     Subject: mm/hwpoison: check the subpage, not the head page
has been added to the -mm tree.  Its filename is
     mm-hwpoison-check-the-subpage-not-the-head-page.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-hwpoison-check-the-subpage-not-the-head-page.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-hwpoison-check-the-subpage-not-the-head-page.patch

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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: mm/hwpoison: check the subpage, not the head page

Hardware poison is tracked on a per-page basis, not on the head page.

Link: https://lkml.kernel.org/r/20220130013042.1906881-1-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/rmap.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/mm/rmap.c~mm-hwpoison-check-the-subpage-not-the-head-page
+++ a/mm/rmap.c
@@ -1553,7 +1553,7 @@ static bool try_to_unmap_one(struct page
 		/* Update high watermark before we lower rss */
 		update_hiwater_rss(mm);
 
-		if (PageHWPoison(page) && !(flags & TTU_IGNORE_HWPOISON)) {
+		if (PageHWPoison(subpage) && !(flags & TTU_IGNORE_HWPOISON)) {
 			pteval = swp_entry_to_pte(make_hwpoison_entry(subpage));
 			if (PageHuge(page)) {
 				hugetlb_count_sub(compound_nr(page), mm);
@@ -1873,7 +1873,7 @@ static bool try_to_migrate_one(struct pa
 			 * memory are supported.
 			 */
 			subpage = page;
-		} else if (PageHWPoison(page)) {
+		} else if (PageHWPoison(subpage)) {
 			pteval = swp_entry_to_pte(make_hwpoison_entry(subpage));
 			if (PageHuge(page)) {
 				hugetlb_count_sub(compound_nr(page), mm);
_

Patches currently in -mm which might be from willy@infradead.org are

mm-hwpoison-check-the-subpage-not-the-head-page.patch