linux-kernel - [PATCH v2] mm/debug: Fix minor issues in mm

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Message-Id: <20250312032344.297946-1-liuye@kylinos.cn>
Date: Wed, 12 Mar 2025 11:23:44 +0800
From: Liu Ye <liuye@...inos.cn>
To: akpm@...ux-foundation.org
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Liu Ye <liuye@...inos.cn>
Subject: [PATCH v2] mm/debug: Fix minor issues in mm

This patch includes several minor fixes:

- Simplify compound page judgment conditions.
- Missing a newline character at the end of the format string.

Each change is independent.

Signed-off-by: Liu Ye <liuye@...inos.cn>

---
V2 : drop Fix out-of-bounds access in page_type_name().
---
---
 mm/debug.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/mm/debug.c b/mm/debug.c
index 8d2acf432385..544b2b05c567 100644
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -132,15 +132,15 @@ static void __dump_page(const struct page *page)
 again:
 	memcpy(&precise, page, sizeof(*page));
 	head = precise.compound_head;
-	if ((head & 1) == 0) {
+	if (head & 1) {
+		foliop = (struct folio *)(head - 1);
+		idx = folio_page_idx(foliop, page);
+	} else {
 		foliop = (struct folio *)&precise;
 		idx = 0;
 		if (!folio_test_large(foliop))
 			goto dump;
 		foliop = (struct folio *)page;
-	} else {
-		foliop = (struct folio *)(head - 1);
-		idx = folio_page_idx(foliop, page);
 	}
 
 	if (idx < MAX_FOLIO_NR_PAGES) {
@@ -165,7 +165,7 @@ static void __dump_page(const struct page *page)
 void dump_page(const struct page *page, const char *reason)
 {
 	if (PagePoisoned(page))
-		pr_warn("page:%p is uninitialized and poisoned", page);
+		pr_warn("page:%p is uninitialized and poisoned\n", page);
 	else
 		__dump_page(page);
 	if (reason)
-- 
2.25.1