linux-kernel - Re: [PATCH] compiler.h: Fix barrier

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Message-ID: <3c0a8d26-a95f-a7ca-60ee-203b67d07875@infradead.org>
Date:   Mon, 16 Nov 2020 14:19:55 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Andreas Schwab <schwab@...ux-m68k.org>
Cc:     Arvind Sankar <nivedita@...m.mit.edu>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH] compiler.h: Fix barrier_data() on clang

On 11/16/20 11:28 AM, Randy Dunlap wrote:
> On 11/16/20 10:30 AM, Andreas Schwab wrote:
>> On Nov 16 2020, Randy Dunlap wrote:
>>
>>> What kernel version are you building?
>>
>> 5.10-rc4
>>
>> Andreas.
> 
> OK, thanks.
> 
> My build machine is slow, but I have a patch that I am testing:
> 
> ---
> From: Randy Dunlap <rdunlap@...radead.org>
> 
> riscv's <vdso/processor.h> uses barrier() so it should
> #include <asm/barrier.h> to prevent build errors.
> 
> Reported-by: Andreas Schwab <schwab@...ux-m68k.org>
> ---
>  arch/riscv/include/asm/vdso/processor.h |    2 ++
>  1 file changed, 2 insertions(+)
> 
> --- lnx-510-rc4.orig/arch/riscv/include/asm/vdso/processor.h
> +++ lnx-510-rc4/arch/riscv/include/asm/vdso/processor.h
> @@ -4,6 +4,8 @@
> 
>  #ifndef __ASSEMBLY__
> 
> +#include <asm/barrier.h>
> +
>  static inline void cpu_relax(void)
>  {
>  #ifdef __riscv_muldiv


This fixes the emulex/benet/ driver build.
I'm still building allmodconfig to see if there are any
other issues.

-- 
~Randy