Hello,
commit 4f86a82ff7df ("x86/atomic: move __arch_atomic_add_unless out of line")
moved __arch_atomic_add_unless() out atomic.h and new KASAN atomic
instrumentation [1] can't see it anymore
In file included from ./arch/x86/include/asm/atomic.h:257:0,
from ./include/linux/atomic.h:4,
from ./include/asm-generic/qspinlock_types.h:28,
from ./arch/x86/include/asm/spinlock_types.h:26,
from ./include/linux/spinlock_types.h:13,
from kernel/bounds.c:13:
./include/asm-generic/atomic-instrumented.h: In function ‘__atomic_add_unless’:
./include/asm-generic/atomic-instrumented.h:70:9: error: implicit declaration of function ‘__arch_atomic_add_unless’ [-Werror=implicit-function-declaration]
return __arch_atomic_add_unless(v, a, u);
^~~~~~~~~~~~~~~~~~~~~~~~
so we need a declaration of __arch_atomic_add_unless() in arch/x86/include/asm/atomic.h
[1] lkml.kernel.org/r/7e450175a324bf93c602909c711bc34715d8e8f2.1489519233.git.dvyukov@xxxxxxxxxx
-ss
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