linux-kernel - Re: [PATCH] powerpc/barrier: Avoid collision with clang's _

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Message-Id: <162398828610.1363949.4994127237137922755.b4-ty@ellerman.id.au>
Date:   Fri, 18 Jun 2021 13:51:26 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Nathan Chancellor <nathan@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Paul Mackerras <paulus@...ba.org>, linuxppc-dev@...ts.ozlabs.org,
        stable@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] powerpc/barrier: Avoid collision with clang's __lwsync macro

On Fri, 28 May 2021 11:27:52 -0700, Nathan Chancellor wrote:
> A change in clang 13 results in the __lwsync macro being defined as
> __builtin_ppc_lwsync, which emits 'lwsync' or 'msync' depending on what
> the target supports. This breaks the build because of -Werror in
> arch/powerpc, along with thousands of warnings:
> 
>  In file included from arch/powerpc/kernel/pmc.c:12:
>  In file included from include/linux/bug.h:5:
>  In file included from arch/powerpc/include/asm/bug.h:109:
>  In file included from include/asm-generic/bug.h:20:
>  In file included from include/linux/kernel.h:12:
>  In file included from include/linux/bitops.h:32:
>  In file included from arch/powerpc/include/asm/bitops.h:62:
>  arch/powerpc/include/asm/barrier.h:49:9: error: '__lwsync' macro redefined [-Werror,-Wmacro-redefined]
>  #define __lwsync()      __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory")
>         ^
>  <built-in>:308:9: note: previous definition is here
>  #define __lwsync __builtin_ppc_lwsync
>         ^
>  1 error generated.
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/barrier: Avoid collision with clang's __lwsync macro
      https://git.kernel.org/powerpc/c/015d98149b326e0f1f02e44413112ca8b4330543

cheers