[PATCH] mm/demotion: Fix NULL vs IS_ERR checking in memory_tier_init

[Miaoqian Lin <linmq006@xxxxxxxxx>]

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

Fixes: 7b88bda3761b ("mm/demotion/dax/kmem: set node's abstract distance to MEMTIER_DEFAULT_DAX_ADISTANCE")
Signed-off-by: Miaoqian Lin <linmq006@xxxxxxxxx>
---
 mm/memory-tiers.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memory-tiers.c b/mm/memory-tiers.c
index fa8c9d07f9ce..ac0dae9e54bf 100644
--- a/mm/memory-tiers.c
+++ b/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__);
 
 	/*
-- 
2.37.3.671.ge2130fe6da78.dirty