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
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------------------------------------------------------
From: Miaoqian Lin <linmq006@xxxxxxxxx>
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@xxxxxxxxx
Fixes: 7b88bda3761b ("mm/demotion/dax/kmem: set node's abstract distance to MEMTIER_DEFAULT_DAX_ADISTANCE")
Signed-off-by: Miaoqian Lin <linmq006@xxxxxxxxx>
Reviewed-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
Cc: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
Cc: Wei Xu <weixugc@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxx are
mm-demotion-fix-null-vs-is_err-checking-in-memory_tier_init.patch
