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From: "Petr Vaněk" <arkamar@atlas.cz>
To: Pavo Banicevic <pavo.banicevic@sartura.hr>
Cc: linux@armlinux.org.uk, ast@kernel.org, daniel@iogearbox.net,
	andrii@kernel.org, kafai@fb.com, songliubraving@fb.com,
	yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org,
	nathan@kernel.org, ndesaulniers@google.com,
	ivan.khoronzhuk@linaro.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
	bpf@vger.kernel.org, clang-built-linux@googlegroups.com,
	matt.redfearn@mips.com, mingo@kernel.org, dvlasenk@redhat.com,
	juraj.vijtiuk@sartura.hr, robert.marko@sartura.hr,
	luka.perkov@sartura.hr, jakov.petrina@sartura.hr
Subject: Re: [PATCH 3/3] include/uapi/linux/swab: Fix potentially missing __always_inline
Date: Wed, 28 Jul 2021 15:49:33 +0200	[thread overview]
Message-ID: <YQFgbRXKIeZ7H6mo@arkam> (raw)
In-Reply-To: <20210727141119.19812-4-pavo.banicevic@sartura.hr>

On Tue, Jul 27, 2021 at 04:11:19PM +0200, Pavo Banicevic wrote:
> From: Matt Redfearn <matt.redfearn@mips.com>
> 
> Commit bc27fb68aaad ("include/uapi/linux/byteorder, swab: force inlining
> of some byteswap operations") added __always_inline to swab functions
> and commit 283d75737837 ("uapi/linux/stddef.h: Provide __always_inline to
> userspace headers") added a definition of __always_inline for use in
> exported headers when the kernel's compiler.h is not available.
> 
> However, since swab.h does not include stddef.h, if the header soup does
> not indirectly include it, the definition of __always_inline is missing,
> resulting in a compilation failure, which was observed compiling the
> perf tool using exported headers containing this commit:
> 
> In file included from /usr/include/linux/byteorder/little_endian.h:12:0,
>                  from /usr/include/asm/byteorder.h:14,
>                  from tools/include/uapi/linux/perf_event.h:20,
>                  from perf.h:8,
>                  from builtin-bench.c:18:
> /usr/include/linux/swab.h:160:8: error: unknown type name `__always_inline'
>  static __always_inline __u16 __swab16p(const __u16 *p)
> 
> Fix this by replacing the inclusion of linux/compiler.h with
> linux/stddef.h to ensure that we pick up that definition if required,
> without relying on it's indirect inclusion. compiler.h is then included
> indirectly, via stddef.h.
> 
> Fixes: 283d75737837 ("uapi/linux/stddef.h: Provide __always_inline to userspace headers")
> 
> Signed-off-by: Matt Redfearn <matt.redfearn@mips.com>
> ---

I use this patch in order to fix __always_inline issue for kernels
5.12+, see https://lore.kernel.org/lkml/YPGXXt6Z3O1W0AYS@arkam/ .
I believe this is the correct solution.

Reviewed-by: Petr Vaněk <arkamar@atlas.cz>

      reply	other threads:[~2021-07-28 13:53 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-27 14:11 [PATCH 0/3] Address compilation of eBPF related software with clang compiler on arm architecture Pavo Banicevic
2021-07-27 14:11 ` [PATCH 1/3] arm: include: asm: swab: mask rev16 instruction for clang Pavo Banicevic
2021-07-27 15:46   ` Yonghong Song
2021-07-27 17:53   ` Nick Desaulniers
2021-07-27 21:43     ` Andrii Nakryiko
2021-07-27 14:11 ` [PATCH 2/3] arm: include: asm: unified: mask .syntax unified " Pavo Banicevic
2021-07-27 17:55   ` Nick Desaulniers
2021-07-27 14:11 ` [PATCH 3/3] include/uapi/linux/swab: Fix potentially missing __always_inline Pavo Banicevic
2021-07-28 13:49   ` Petr Vaněk [this message]

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