linux-kernel - [mmotm] "x86/atomic: move __arch_atomic_add

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Date:   Thu, 16 Mar 2017 13:47:04 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>, Ingo Molnar <mingo@...e.hu>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [mmotm] "x86/atomic: move __arch_atomic_add_unless out of line"
 build error

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@...gle.com

	-ss