[merged] kasan-page_alloc-refactor-init-checks-in-post_alloc_hook.patch removed from -mm tree

[merged] kasan-page_alloc-refactor-init-checks-in-post_alloc_hook.patch removed from -mm tree

[Andrew Morton]

The patch titled
     Subject: kasan, page_alloc: refactor init checks in post_alloc_hook
has been removed from the -mm tree.  Its filename was
     kasan-page_alloc-refactor-init-checks-in-post_alloc_hook.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
From: Andrey Konovalov <andreyknvl@google.com>
Subject: kasan, page_alloc: refactor init checks in post_alloc_hook

Separate 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.

Link: https://lkml.kernel.org/r/2283fde963adfd8a2b29a92066f106cc16661a3c.1643047180.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Acked-by: Marco Elver <elver@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Collingbourne <pcc@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/page_alloc.c |   20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

--- a/mm/page_alloc.c~kasan-page_alloc-refactor-init-checks-in-post_alloc_hook
+++ a/mm/page_alloc.c
@@ -2368,19 +2368,21 @@ inline void post_alloc_hook(struct page
 		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;
-
-				for (i = 0; i < 1 << order; i++)
-					tag_clear_highpage(page + i);
-			} else {
-				kernel_init_free_pages(page, 1 << order);
-			}
+		if (init_tags) {
+			int i;
+
+			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);
_

Patches currently in -mm which might be from andreyknvl@google.com are

stacktrace-add-interface-based-on-shadow-call-stack.patch
arm64-scs-save-scs_sp-values-per-cpu-when-switching-stacks.patch
arm64-implement-stack_trace_save_shadow.patch
kasan-use-stack_trace_save_shadow.patch