The patch titled
Subject: mm-memory_hotplug-remove-head-variable-in-do_migrate_range-fix
has been added to the -mm mm-unstable branch. Its filename is
mm-memory_hotplug-remove-head-variable-in-do_migrate_range-fix.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memory_hotplug-remove-head-variable-in-do_migrate_range-fix.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: mm-memory_hotplug-remove-head-variable-in-do_migrate_range-fix
Date: Mon Aug 19 10:36:53 PM PDT 2024
revise comment, per Jonathan
Cc: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Naoya Horiguchi <nao.horiguchi@xxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory_hotplug.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/mm/memory_hotplug.c~mm-memory_hotplug-remove-head-variable-in-do_migrate_range-fix
+++ a/mm/memory_hotplug.c
@@ -1788,10 +1788,10 @@ static void do_migrate_range(unsigned lo
folio = page_folio(page);
/*
- * The folio hold no reference or lock, it might be changed
- * concurrently(eg, split), folio_nr_pages() may read garbage,
- * but out loop could handle that as it revisits the split
- * folio later.
+ * No reference or lock is held on the folio, so it might
+ * be modified concurrently (e.g. split). As such,
+ * folio_nr_pages() may read garbage. This is fine as the outer
+ * loop will revisit the split folio later.
*/
if (folio_test_large(folio)) {
pfn = folio_pfn(folio) + folio_nr_pages(folio) - 1;
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
include-linux-mmzoneh-clean-up-watermark-accessors.patch
mm-memory_hotplug-remove-head-variable-in-do_migrate_range-fix.patch
fault-inject-improve-build-for-config_fault_injection=n-fix.patch
fault-inject-improve-build-for-config_fault_injection=n-fix-2.patch
fault-inject-improve-build-for-config_fault_injection=n-fix-3.patch
