linux-kernel - [PATCH] mm: page_alloc: avoid false page outside zone error info

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Date:   Tue, 4 Jul 2023 19:18:23 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH] mm: page_alloc: avoid false page outside zone error info

If pfn is outside zone boundaries in the first round, ret will be set
to 1. But if pfn is changed to inside the zone boundaries in zone span
seqretry path, ret is still set to 1 leading to false page outside zone
error info.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/page_alloc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 7d3460c7a480..40a9f3ed25e9 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -459,7 +459,7 @@ void set_pageblock_migratetype(struct page *page, int migratetype)
 #ifdef CONFIG_DEBUG_VM
 static int page_outside_zone_boundaries(struct zone *zone, struct page *page)
 {
-	int ret = 0;
+	int ret;
 	unsigned seq;
 	unsigned long pfn = page_to_pfn(page);
 	unsigned long sp, start_pfn;
@@ -470,6 +470,8 @@ static int page_outside_zone_boundaries(struct zone *zone, struct page *page)
 		sp = zone->spanned_pages;
 		if (!zone_spans_pfn(zone, pfn))
 			ret = 1;
+		else
+			ret = 0;
 	} while (zone_span_seqretry(zone, seq));
 
 	if (ret)
-- 
2.33.0