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| author |   Jakub Kicinski <kuba@kernel.org> | 2022-02-03 17:36:16 -0800 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-02-03 17:36:16 -0800 |
| commit | c59400a68c53374179cdc5f99fa77afbd092dcf8 (patch) | |
| tree | c5e17286fa5b7867a5290a975cca3bc5759d510e /include/linux/mm.h | |
| parent | Merge branch 'dsa-mv88e6xxx-phylink_generic_validate' (diff) | |
| parent | gcc-plugins/stackleak: Use noinstr in favor of notrace (diff) | |
| download | linux-dev-c59400a68c53374179cdc5f99fa77afbd092dcf8.tar.xz linux-dev-c59400a68c53374179cdc5f99fa77afbd092dcf8.zip | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
No conflicts.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/linux/mm.h')
| -rw-r--r-- | include/linux/mm.h | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index e1a84b1e6787..213cc569b192 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1506,11 +1506,18 @@ static inline u8 page_kasan_tag(const struct page *page) static inline void page_kasan_tag_set(struct page *page, u8 tag) { - if (kasan_enabled()) { - tag ^= 0xff; - page->flags &= ~(KASAN_TAG_MASK << KASAN_TAG_PGSHIFT); - page->flags |= (tag & KASAN_TAG_MASK) << KASAN_TAG_PGSHIFT; - } + unsigned long old_flags, flags; + + if (!kasan_enabled()) + return; + + tag ^= 0xff; + old_flags = READ_ONCE(page->flags); + do { + flags = old_flags; + flags &= ~(KASAN_TAG_MASK << KASAN_TAG_PGSHIFT); + flags |= (tag & KASAN_TAG_MASK) << KASAN_TAG_PGSHIFT; + } while (unlikely(!try_cmpxchg(&page->flags, &old_flags, flags))); } static inline void page_kasan_tag_reset(struct page *page) |