diff mbox series

[mm,v3,04/38] kasan, page_alloc: simplify kasan_poison_pages call site

Message ID 4b39d778ac71937325641c3d7a36889b37fb3242.1639432170.git.andreyknvl@google.com (mailing list archive)
State New
Headers show
Series kasan, vmalloc, arm64: add vmalloc tagging support for SW/HW_TAGS | expand

Commit Message

andrey.konovalov@linux.dev Dec. 13, 2021, 9:51 p.m. UTC 
From: Andrey Konovalov <andreyknvl@google.com>

Simplify the code around calling kasan_poison_pages() in
free_pages_prepare().

This patch does no functional changes.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>

---

Changes v1->v2:
- Don't reorder kasan_poison_pages() and free_pages_prepare().
---
 mm/page_alloc.c | 18 +++++-------------
 1 file changed, 5 insertions(+), 13 deletions(-)

Comments

Alexander Potapenko Dec. 16, 2021, 12:54 p.m. UTC | #1 
On Mon, Dec 13, 2021 at 10:52 PM <andrey.konovalov@linux.dev> wrote:
>
> From: Andrey Konovalov <andreyknvl@google.com>
>
> Simplify the code around calling kasan_poison_pages() in
> free_pages_prepare().
>
> This patch does no functional changes.
>
> Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
diff mbox series

Patch

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 740fb01a27ed..db8cecdd0aaa 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1301,6 +1301,7 @@  static __always_inline bool free_pages_prepare(struct page *page,
 {
 	int bad = 0;
 	bool skip_kasan_poison = should_skip_kasan_poison(page, fpi_flags);
+	bool init = want_init_on_free();
 
 	VM_BUG_ON_PAGE(PageTail(page), page);
 
@@ -1373,19 +1374,10 @@  static __always_inline bool free_pages_prepare(struct page *page,
 	 * With hardware tag-based KASAN, memory tags must be set before the
 	 * page becomes unavailable via debug_pagealloc or arch_free_page.
 	 */
-	if (kasan_has_integrated_init()) {
-		bool init = want_init_on_free();
-
-		if (!skip_kasan_poison)
-			kasan_poison_pages(page, order, init);
-	} else {
-		bool init = want_init_on_free();
-
-		if (init)
-			kernel_init_free_pages(page, 1 << order);
-		if (!skip_kasan_poison)
-			kasan_poison_pages(page, order, init);
-	}
+	if (init && !kasan_has_integrated_init())
+		kernel_init_free_pages(page, 1 << order);
+	if (!skip_kasan_poison)
+		kasan_poison_pages(page, order, init);
 
 	/*
 	 * arch_free_page() can make the page's contents inaccessible.  s390