The patch titled
Subject: mm/compaction: fix the total_isolated in strict mode
has been added to the -mm mm-unstable branch. Its filename is
mm-compaction-fix-the-total_isolated-in-strict-mode.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-compaction-fix-the-total_isolated-in-strict-mode.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: Qiang Liu <liuq131@xxxxxxxxxxxxxxx>
Subject: mm/compaction: fix the total_isolated in strict mode
Date: Sat, 2 Nov 2024 20:16:21 +0000
If the last cycle reads bogus compound_order() and blockpfn > end_pfn
occurs, it is possible that total_isolated will be less than nr_scanned.
In this case, strict mode should return 0, but the â??if (strict &&
blockpfn < end_pfn)â?? statement cannot recognize this situation
Link: https://lkml.kernel.org/r/20241102201621.95291-1-liuq131@xxxxxxxxxxxxxxx
Signed-off-by: Qiang Liu <liuq131@xxxxxxxxxxxxxxx>
Cc: Laura Abbott <labbott@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/compaction.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/compaction.c~mm-compaction-fix-the-total_isolated-in-strict-mode
+++ a/mm/compaction.c
@@ -699,7 +699,7 @@ isolate_fail:
* pages requested were isolated. If there were any failures, 0 is
* returned and CMA will fail.
*/
- if (strict && blockpfn < end_pfn)
+ if (strict && (blockpfn < end_pfn || total_isolated != nr_scanned))
total_isolated = 0;
cc->total_free_scanned += nr_scanned;
_
Patches currently in -mm which might be from liuq131@xxxxxxxxxxxxxxx are
mm-compaction-fix-the-total_isolated-in-strict-mode.patch
