Thread (47 messages) 47 messages, 4 authors, 2021-12-13
STALE1632d
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[PATCH v2 09/34] kasan, page_alloc: refactor init checks in post_alloc_hook

From: <hidden>
Date: 2021-12-06 21:44:53
Also in: linux-mm, lkml
Subsystem: memory management, memory management - page allocator, the rest · Maintainers: Andrew Morton, Vlastimil Babka, Linus Torvalds

From: Andrey Konovalov <redacted>

This patch separates code for zeroing memory from the code clearing tags
in post_alloc_hook().

This patch is not useful by itself but makes the simplifications in
the following patches easier to follow.

This patch does no functional changes.

Signed-off-by: Andrey Konovalov <redacted>
---
 mm/page_alloc.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f70bfa63a374..507004a54f2f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2405,19 +2405,21 @@ inline void post_alloc_hook(struct page *page, unsigned int order,
 		kasan_alloc_pages(page, order, gfp_flags);
 	} else {
 		bool init = !want_init_on_free() && want_init_on_alloc(gfp_flags);
+		bool init_tags = init && (gfp_flags & __GFP_ZEROTAGS);
 
 		kasan_unpoison_pages(page, order, init);
 
-		if (init) {
-			if (gfp_flags & __GFP_ZEROTAGS) {
-				int i;
+		if (init_tags) {
+			int i;
 
-				for (i = 0; i < 1 << order; i++)
-					tag_clear_highpage(page + i);
-			} else {
-				kernel_init_free_pages(page, 1 << order);
-			}
+			for (i = 0; i < 1 << order; i++)
+				tag_clear_highpage(page + i);
+
+			init = false;
 		}
+
+		if (init)
+			kernel_init_free_pages(page, 1 << order);
 	}
 
 	set_page_owner(page, order, gfp_flags);
-- 
2.25.1


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