linux-kernel - [PATCH] mm: page_alloc: call panic() when memoryless node allocation fails

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Message-Id: <20230212111027.95520-1-zhengqi.arch@bytedance.com>
Date:   Sun, 12 Feb 2023 19:10:27 +0800
From:   Qi Zheng <zhengqi.arch@...edance.com>
To:     akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Qi Zheng <zhengqi.arch@...edance.com>
Subject: [PATCH] mm: page_alloc: call panic() when memoryless node allocation fails

In free_area_init(), we will continue to run after pgdat of memoryless
node allocation fails. However, in the subsequent process (such as when
initializing zonelist), the case that NODE_DATA(nid) is NULL is not
handled, which will cause panic. Instead of this, it's better to call
panic() directly when the memory allocation fails during system boot.

Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
---
 mm/page_alloc.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0745aedebb37..588555754601 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8360,11 +8360,9 @@ void __init free_area_init(unsigned long *max_zone_pfn)
 
 			/* Allocator not initialized yet */
 			pgdat = arch_alloc_nodedata(nid);
-			if (!pgdat) {
-				pr_err("Cannot allocate %zuB for node %d.\n",
-						sizeof(*pgdat), nid);
-				continue;
-			}
+			if (!pgdat)
+				panic("Cannot allocate %zuB for node %d.\n",
+				       sizeof(*pgdat), nid);
 			arch_refresh_nodedata(nid, pgdat);
 			free_area_init_memoryless_node(nid);
 
-- 
2.20.1