+ mm-mempolicy-fix-weighted-interleave-auto-sysfs-name.patch added to mm-hotfixes-unstable branch

+ mm-mempolicy-fix-weighted-interleave-auto-sysfs-name.patch added to mm-hotfixes-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/mempolicy: fix weighted interleave auto sysfs name
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     mm-mempolicy-fix-weighted-interleave-auto-sysfs-name.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mempolicy-fix-weighted-interleave-auto-sysfs-name.patch

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

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------------------------------------------------------
From: Joshua Hahn <joshua.hahnjy@gmail.com>
Subject: mm/mempolicy: fix weighted interleave auto sysfs name
Date: Tue, 7 Apr 2026 07:14:14 -0700

The __ATTR macro is a utility that makes defining kobj_attributes easier
by stringfying the name, verifying the mode, and setting the show/store
fields in a single initializer.  It takes a raw token as the first value,
rather than a string, so that __ATTR family macros like __ATTR_RW can
token-paste it for inferring the _show / _store function names.

Commit e341f9c3c841 ("mm/mempolicy: Weighted Interleave Auto-tuning") used
the __ATTR macro to define the "auto" sysfs for weighted interleave.  A
few months later, commit 2fb6915fa22d ("compiler_types.h: add "auto" as a
macro for "__auto_type"") introduced a #define macro which expanded auto
into __auto_type.

This led to the "auto" token passed into __ATTR to be expanded out into
__auto_type, and the sysfs entry to be displayed as __auto_type as well.

Expand out the __ATTR macro and directly pass a string "auto" instead of
the raw token 'auto' to prevent it from being expanded out.  Also bypass
the VERIFY_OCTAL_PERMISSIONS check by triple checking that 0664 is indeed
the intended permissions for this sysfs file.

Before:
$ ls /sys/kernel/mm/mempolicy/weighted_interleave
__auto_type  node0

After:
$ ls /sys/kernel/mm/mempolicy/weighted_interleave/
auto  node0

Link: https://lkml.kernel.org/r/20260407141415.3080960-1-joshua.hahnjy@gmail.com
Fixes: 2fb6915fa22d ("compiler_types.h: add "auto" as a macro for "__auto_type"")
Signed-off-by: Joshua Hahn <joshua.hahnjy@gmail.com>
Reviewed-by: Gregory Price <gourry@gourry.net>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Byungchul Park <byungchul@sk.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: "Huang, Ying" <ying.huang@linux.alibaba.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Rakie Kim <rakie.kim@sk.com>
Cc: Ying Huang <ying.huang@linux.alibaba.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/mempolicy.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

--- a/mm/mempolicy.c~mm-mempolicy-fix-weighted-interleave-auto-sysfs-name
+++ a/mm/mempolicy.c
@@ -3781,9 +3781,11 @@ static void wi_state_free(void)
 	}
 }
 
-static struct kobj_attribute wi_auto_attr =
-	__ATTR(auto, 0664, weighted_interleave_auto_show,
-			   weighted_interleave_auto_store);
+static struct kobj_attribute wi_auto_attr = {
+	.attr = { .name = "auto", .mode = 0664 },
+	.show = weighted_interleave_auto_show,
+	.store = weighted_interleave_auto_store,
+};
 
 static void wi_cleanup(void) {
 	sysfs_remove_file(&wi_group->wi_kobj, &wi_auto_attr.attr);
_

Patches currently in -mm which might be from joshua.hahnjy@gmail.com are

mm-mempolicy-fix-weighted-interleave-auto-sysfs-name.patch