+ mm-demotion-fix-null-vs-is_err-checking-in-memory_tier_init.patch added to mm-unstable branch

+ mm-demotion-fix-null-vs-is_err-checking-in-memory_tier_init.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/demotion: fix NULL vs IS_ERR checking in memory_tier_init
has been added to the -mm mm-unstable branch.  Its filename is
     mm-demotion-fix-null-vs-is_err-checking-in-memory_tier_init.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-demotion-fix-null-vs-is_err-checking-in-memory_tier_init.patch

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

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Miaoqian Lin <linmq006@gmail.com>
Subject: mm/demotion: fix NULL vs IS_ERR checking in memory_tier_init
Date: Thu, 10 Nov 2022 07:07:51 +0400

alloc_memory_type() returns error pointers on error instead of NULL.  Use
IS_ERR() to check the return value to fix this.

Link: https://lkml.kernel.org/r/20221110030751.1627266-1-linmq006@gmail.com
Fixes: 7b88bda3761b ("mm/demotion/dax/kmem: set node's abstract distance to MEMTIER_DEFAULT_DAX_ADISTANCE")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Wei Xu <weixugc@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

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

--- a/mm/memory-tiers.c~mm-demotion-fix-null-vs-is_err-checking-in-memory_tier_init
+++ a/mm/memory-tiers.c
@@ -645,7 +645,7 @@ static int __init memory_tier_init(void)
 	 * than default DRAM tier.
 	 */
 	default_dram_type = alloc_memory_type(MEMTIER_ADISTANCE_DRAM);
-	if (!default_dram_type)
+	if (IS_ERR(default_dram_type))
 		panic("%s() failed to allocate default DRAM tier\n", __func__);
 
 	/*
_

Patches currently in -mm which might be from linmq006@gmail.com are

mm-demotion-fix-null-vs-is_err-checking-in-memory_tier_init.patch