[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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