linux-kernel - Re: [PATCH 1/5] perf tools: Add get_unaligned

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Message-ID: <ZR8QnasisGEsaaDR@kernel.org>
Date:   Thu, 5 Oct 2023 16:38:05 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 1/5] perf tools: Add get_unaligned_leNN()

Em Thu, Oct 05, 2023 at 10:04:47PM +0300, Adrian Hunter escreveu:
> Add get_unaligned_le16(), get_unaligned_le32 and get_unaligned_le64, same
> as include/asm-generic/unaligned.h.
> 
> Use diagnostic pragmas to ignore -Wpacked used by perf build.

Can we get the tools copy of include/asm-generic/unaligned.h closer and
have it in check-headers.sh?

- Arnaldo
 
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
>  tools/include/asm-generic/unaligned.h | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/tools/include/asm-generic/unaligned.h b/tools/include/asm-generic/unaligned.h
> index 47387c607035..9140bb4e16c6 100644
> --- a/tools/include/asm-generic/unaligned.h
> +++ b/tools/include/asm-generic/unaligned.h
> @@ -6,6 +6,9 @@
>  #ifndef __TOOLS_LINUX_ASM_GENERIC_UNALIGNED_H
>  #define __TOOLS_LINUX_ASM_GENERIC_UNALIGNED_H
>  
> +#pragma GCC diagnostic push
> +#pragma GCC diagnostic ignored "-Wpacked"
> +
>  #define __get_unaligned_t(type, ptr) ({						\
>  	const struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr);	\
>  	__pptr->x;								\
> @@ -19,5 +22,22 @@
>  #define get_unaligned(ptr)	__get_unaligned_t(typeof(*(ptr)), (ptr))
>  #define put_unaligned(val, ptr) __put_unaligned_t(typeof(*(ptr)), (val), (ptr))
>  
> +static inline u16 get_unaligned_le16(const void *p)
> +{
> +	return le16_to_cpu(__get_unaligned_t(__le16, p));
> +}
> +
> +static inline u32 get_unaligned_le32(const void *p)
> +{
> +	return le32_to_cpu(__get_unaligned_t(__le32, p));
> +}
> +
> +static inline u64 get_unaligned_le64(const void *p)
> +{
> +	return le64_to_cpu(__get_unaligned_t(__le64, p));
> +}
> +
> +#pragma GCC diagnostic pop
> +
>  #endif /* __TOOLS_LINUX_ASM_GENERIC_UNALIGNED_H */
>  
> -- 
> 2.34.1
> 

-- 

- Arnaldo