+ tools-testing-shared-catch-a-failed-posix_memalign.patch added to mm-unstable branch

+ tools-testing-shared-catch-a-failed-posix_memalign.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: tools/testing/shared: catch a failed posix_memalign()
has been added to the -mm mm-unstable branch.  Its filename is
     tools-testing-shared-catch-a-failed-posix_memalign.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/tools-testing-shared-catch-a-failed-posix_memalign.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: "Liam R. Howlett (Google)" <liam@infradead.org>
Subject: tools/testing/shared: catch a failed posix_memalign()
Date: Mon, 19 Oct 2026 23:31:28 -0400

posix_memalign() returns zero or a positive error number and never sets
errno, so the checks for a negative return in kmem_cache_alloc_lru() and
kmem_cache_alloc_bulk() is not possible.  A failed aligned allocation
carries on with the pointer unset, into the constructor or the memset().

Test for any non-zero return.

Link: https://lore.kernel.org/20261020033128.1934349-1-liam@infradead.org
Signed-off-by: Liam R. Howlett (Google) <liam@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Vlastimil Babka <vbabka@kernel.org>
---

 tools/testing/shared/linux.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/tools/testing/shared/linux.c~tools-testing-shared-catch-a-failed-posix_memalign
+++ a/tools/testing/shared/linux.c
@@ -83,7 +83,7 @@ void *kmem_cache_alloc_lru(struct kmem_c
 	} else {
 		pthread_mutex_unlock(&cachep->lock);
 		if (cachep->align) {
-			if (posix_memalign(&p, cachep->align, cachep->size) < 0)
+			if (posix_memalign(&p, cachep->align, cachep->size))
 				return NULL;
 		} else {
 			p = malloc(cachep->size);
@@ -191,7 +191,7 @@ bool kmem_cache_alloc_bulk(struct kmem_c
 
 			if (cachep->align) {
 				if (posix_memalign(&p[i], cachep->align,
-					       cachep->size) < 0)
+					       cachep->size))
 					break;
 			} else {
 				p[i] = malloc(cachep->size);
_

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

tools-testing-shared-catch-a-failed-posix_memalign.patch