Subject: Re: [PATCH] arm64: fix unreachable code issue with cmpxchg

From: Nathan Chancellor <[email-masked]>
Date: Mon, 9 Sep 2019 20:42:49 -0700

On Mon, Sep 09, 2019 at 10:21:35PM +0200, Arnd Bergmann wrote:
> On arm64 build with clang, sometimes the __cmpxchg_mb is not inlined
> when CONFIG_OPTIMIZE_INLINING is set.
> Clang then fails a compile-time assertion, because it cannot tell at
> compile time what the size of the argument is:
> 
> mm/memcontrol.o: In function `__cmpxchg_mb':
> memcontrol.c:(.text+0x1a4c): undefined reference to `__compiletime_assert_175'
> memcontrol.c:(.text+0x1a4c): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `__compiletime_assert_175'
> 
> Mark all of the cmpxchg() style functions as __always_inline to
> ensure that the compiler can see the result.
> 
> Signed-off-by: Arnd Bergmann <[email-masked]>

Reviewed-by: Nathan Chancellor <[email-masked]>
Tested-by: Nathan Chancellor <[email-masked]>

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