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kasan, page_alloc: simplify kasan_poison_pages call site 

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

This patch does no functional changes.

Link: https://lkml.kernel.org/r/ae4f9bcf071577258e786bcec4798c145d718c46.1643047180.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 18:10:13 -07:00 committed by Linus Torvalds
parent 7c13c163e0
commit c3525330a0
1 changed files with 5 additions and 13 deletions
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18
mm/page_alloc.c
View File

@ -1298,6 +1298,7 @@ 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);
@ -1370,19 +1371,10 @@ 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