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kasan: mark addr_has_metadata __always_inline

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Patch series "objtool warning fixes", v2.

These are three of the easier fixes for objtool warnings around
kasan/kmsan/kcsan.  I dropped one patch since Peter had come up with a
better fix, and adjusted the changelog text based on feedback.


This patch (of 3):

When the compiler decides not to inline this function, objtool complains
about incorrect UACCESS state:

mm/kasan/generic.o: warning: objtool: __asan_load2+0x11: call to addr_has_metadata() with UACCESS enabled

Link: https://lore.kernel.org/all/20230208164011.2287122-1-arnd@kernel.org/
Link: https://lkml.kernel.org/r/20230215130058.3836177-2-arnd@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Marco Elver <elver@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Arnd Bergmann 2023-02-15 14:00:56 +01:00 committed by Andrew Morton
parent f7a449f779
commit 9701c9ff83
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
mm/kasan/kasan.h
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@ -297,7 +297,7 @@ static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
<< KASAN_SHADOW_SCALE_SHIFT);
}
static inline bool addr_has_metadata(const void *addr)
static __always_inline bool addr_has_metadata(const void *addr)
{
return (kasan_reset_tag(addr) >=
kasan_shadow_to_mem((void *)KASAN_SHADOW_START));
@ -316,7 +316,7 @@ bool kasan_check_range(unsigned long addr, size_t size, bool write,
#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
static inline bool addr_has_metadata(const void *addr)
static __always_inline bool addr_has_metadata(const void *addr)
{
return (is_vmalloc_addr(addr) || virt_addr_valid(addr));
}