kasan: mark addr_has_metadata __always_inline

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/[email protected]/
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnd Bergmann <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Marco Elver <[email protected]>
Reviewed-by: Andrey Konovalov <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Kuan-Ying Lee <[email protected]>
Cc: Vincenzo Frascino <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: arndb

mm/kasan/kasan.h

@@ -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));
 }