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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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Konovalov 2022-03-24 18:10:28 -07:00 committed by Linus Torvalds
parent 1c0e5b24f1
commit b8491b9052
1 changed files with 10 additions and 8 deletions
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18
mm/page_alloc.c
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@ -2368,19 +2368,21 @@ 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);