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From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Nathan Chancellor <nathan@kernel.org>,
	Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>,
	linuxppc-dev@lists.ozlabs.org, stable@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Nick Desaulniers <ndesaulniers@google.com>,
	clang-built-linux@googlegroups.com
Subject: Re: [PATCH] powerpc/barrier: Avoid collision with clang's __lwsync macro
Date: Fri, 18 Jun 2021 13:51:26 +1000	[thread overview]
Message-ID: <162398828610.1363949.4994127237137922755.b4-ty@ellerman.id.au> (raw)
In-Reply-To: <20210528182752.1852002-1-nathan@kernel.org>

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

      parent reply	other threads:[~2021-06-18  4:24 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-28 18:27 [PATCH] powerpc/barrier: Avoid collision with clang's __lwsync macro Nathan Chancellor
2021-06-01 18:23 ` Nick Desaulniers
2021-06-18  3:51 ` Michael Ellerman [this message]

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