+ mm-oom_kill-remove-unreachable-__gfp_thisnode-check-in-constrained_alloc.patch added to mm-new branch

+ mm-oom_kill-remove-unreachable-__gfp_thisnode-check-in-constrained_alloc.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm/oom_kill: remove unreachable __GFP_THISNODE check in constrained_alloc()
has been added to the -mm mm-new branch.  Its filename is
     mm-oom_kill-remove-unreachable-__gfp_thisnode-check-in-constrained_alloc.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-oom_kill-remove-unreachable-__gfp_thisnode-check-in-constrained_alloc.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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------------------------------------------------------
From: Ye Liu <liuye@kylinos.cn>
Subject: mm/oom_kill: remove unreachable __GFP_THISNODE check in constrained_alloc()
Date: Thu, 13 Aug 2026 17:38:09 +0800

The __GFP_THISNODE check in constrained_alloc() is dead code: global OOM
is never triggered with __GFP_THISNODE (blocked in __alloc_pages_may_oom
before out_of_memory() is called), and memcg OOM returns CONSTRAINT_MEMCG
at the top of the function before reaching this point.  Remove the check,
its stale comment, and update the following comment that referenced
__GFP_THISNODE.

Link: https://lore.kernel.org/20260813093810.573302-1-ye.liu@linux.dev
Signed-off-by: Ye Liu <liuye@kylinos.cn>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Cc: David Rientjes <rientjes@google.com>
Cc: Liu Ye <liuye@kylinos.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/oom_kill.c |   13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

--- a/mm/oom_kill.c~mm-oom_kill-remove-unreachable-__gfp_thisnode-check-in-constrained_alloc
+++ a/mm/oom_kill.c
@@ -267,18 +267,11 @@ static enum oom_constraint constrained_a
 
 	if (!oc->zonelist)
 		return CONSTRAINT_NONE;
-	/*
-	 * Reach here only when __GFP_NOFAIL is used. So, we should avoid
-	 * to kill current.We have to random task kill in this case.
-	 * Hopefully, CONSTRAINT_THISNODE...but no way to handle it, now.
-	 */
-	if (oc->gfp_mask & __GFP_THISNODE)
-		return CONSTRAINT_NONE;
 
 	/*
-	 * This is not a __GFP_THISNODE allocation, so a truncated nodemask in
-	 * the page allocator means a mempolicy is in effect.  Cpuset policy
-	 * is enforced in get_page_from_freelist().
+	 * A truncated nodemask in the page allocator means a mempolicy
+	 * is in effect.  Cpuset policy is enforced in
+	 * get_page_from_freelist().
 	 */
 	if (oc->nodemask &&
 	    !nodes_subset(node_states[N_MEMORY], *oc->nodemask)) {
_

Patches currently in -mm which might be from liuye@kylinos.cn are

mm-vmalloc-fix-vmap_purge_lock-livelock-under-memory-pressure.patch
tools-mm-page_owner_sort-fix-sort-option-being-silently-ignored.patch
tools-mm-page_owner_sort-add-module-name-sort-cull-filter-support.patch
tools-mm-page_owner_sort-show-available-sort-keys-in-usage-text.patch
mm-oom_kill-remove-unreachable-__gfp_thisnode-check-in-constrained_alloc.patch