+ mm-migrate-move-numa-hinting-fault-folio-isolation-checks-under-ptl-fix.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm-migrate-move-numa-hinting-fault-folio-isolation-checks-under-ptl-fix
has been added to the -mm mm-unstable branch.  Its filename is
     mm-migrate-move-numa-hinting-fault-folio-isolation-checks-under-ptl-fix.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-migrate-move-numa-hinting-fault-folio-isolation-checks-under-ptl-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: David Hildenbrand <david@redhat.com>
Subject: mm-migrate-move-numa-hinting-fault-folio-isolation-checks-under-ptl-fix
Date: Wed, 26 Jun 2024 18:14:44 +0200

Donet reports an issue during NUMA migration we haven't seen previously:

	[   71.422804] list_del corruption, c00c00000061b3c8->next is
	LIST_POISON1 (5deadbeef0000100)
	[   71.422839] ------------[ cut here ]------------
	[   71.422843] kernel BUG at lib/list_debug.c:56!
	[   71.422850] Oops: Exception in kernel mode, sig: 5 [#1]

We forgot to convert one "return 0;" to return an error instead from
migrate_misplaced_folio_prepare() in case the target node is nearly
full.

Link: https://lkml.kernel.org/r/8f85c31a-e603-4578-bf49-136dae0d4b69@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Donet Tom <donettom@linux.ibm.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/migrate.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/migrate.c~mm-migrate-move-numa-hinting-fault-folio-isolation-checks-under-ptl-fix
+++ a/mm/migrate.c
@@ -2564,7 +2564,7 @@ int migrate_misplaced_folio_prepare(stru
 		int z;
 
 		if (!(sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING))
-			return 0;
+			return -EAGAIN;
 		for (z = pgdat->nr_zones - 1; z >= 0; z--) {
 			if (managed_zone(pgdat->node_zones + z))
 				break;
_

Patches currently in -mm which might be from david@redhat.com are

mm-update-_mapcount-and-page_type-documentation.patch
mm-allow-reuse-of-the-lower-16-bit-of-the-page-type-with-an-actual-type.patch
mm-zsmalloc-use-a-proper-page-type.patch
mm-page_alloc-clear-pagebuddy-using-__clearpagebuddy-for-bad-pages.patch
mm-filemap-reinitialize-folio-_mapcount-directly.patch
mm-mm_init-initialize-page-_mapcount-directly-in-__init_single_page.patch
mm-pass-meminit_context-to-__free_pages_core.patch
mm-pass-meminit_context-to-__free_pages_core-fix.patch
mm-pass-meminit_context-to-__free_pages_core-fix-2.patch
mm-pass-meminit_context-to-__free_pages_core-fix-3.patch
mm-memory_hotplug-initialize-memmap-of-zone_device-with-pageoffline-instead-of-pagereserved.patch
mm-memory_hotplug-skip-adjust_managed_page_count-for-pageoffline-pages-when-offlining.patch
mm-read-page_type-using-read_once.patch
mm-migrate-make-migrate_misplaced_folio-return-0-on-success.patch
mm-migrate-move-numa-hinting-fault-folio-isolation-checks-under-ptl.patch
mm-migrate-move-numa-hinting-fault-folio-isolation-checks-under-ptl-fix.patch