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Message-ID: <04749e2c-6e80-5316-a575-e4aaf780bb81@gmail.com>
Date: Thu, 14 Jan 2021 11:40:39 +0300
From: Sergei Shtylyov <sergei.shtylyov@...il.com>
To: Tiezhu Yang <yangtiezhu@...ngson.cn>,
Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>,
Nathan Chancellor <natechancellor@...il.com>,
Nick Desaulniers <ndesaulniers@...gle.com>
Cc: linux-sparse@...r.kernel.org, netdev@...r.kernel.org,
bpf@...r.kernel.org, clang-built-linux@...glegroups.com,
linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
Xuefeng Li <lixuefeng@...ngson.cn>
Subject: Re: [PATCH 2/2] compiler.h: Include asm/rwonce.h under ARM64 and
ALPHA to fix build errors
Hello!
On 13.01.2021 13:57, Tiezhu Yang wrote:
> When make M=samples/bpf on the Loongson 3A3000 platform which
> belongs to MIPS arch, there exists many similar build errors
> about 'asm/rwonce.h' file not found, so include it only under
> CONFIG_ARM64 and CONFIG_ALPHA due to it exists only in arm64
> and alpha arch.
>
> CLANG-bpf samples/bpf/xdpsock_kern.o
> In file included from samples/bpf/xdpsock_kern.c:2:
> In file included from ./include/linux/bpf.h:9:
> In file included from ./include/linux/workqueue.h:9:
> In file included from ./include/linux/timer.h:5:
> In file included from ./include/linux/list.h:9:
> In file included from ./include/linux/kernel.h:10:
> ./include/linux/compiler.h:246:10: fatal error: 'asm/rwonce.h' file not found
> ^~~~~~~~~~~~~~
> 1 error generated.
>
> $ find . -name rwonce.h
> ./include/asm-generic/rwonce.h
> ./arch/arm64/include/asm/rwonce.h
> ./arch/alpha/include/asm/rwonce.h
>
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
> ---
> include/linux/compiler.h | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/include/linux/compiler.h b/include/linux/compiler.h
> index b8fe0c2..bdbe759 100644
> --- a/include/linux/compiler.h
> +++ b/include/linux/compiler.h
> @@ -243,6 +243,12 @@ static inline void *offset_to_ptr(const int *off)
> */
> #define prevent_tail_call_optimization() mb()
>
> +#ifdef CONFIG_ARM64
Why not #if defined(CONFIG_ALPHA) || defined(CONFIG_ARM64)?
> #include <asm/rwonce.h>
> +#endif
> +
> +#ifdef CONFIG_ALPHA
> +#include <asm/rwonce.h>
> +#endif
>
> #endif /* __LINUX_COMPILER_H */
>
MBR, Sergei
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