linux-kernel - Re: [PATCH] bpf: samples: exclude asm/sysreg.h for arm64

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Message-ID: <20151112224208.GA64046@ast-mbp.thefacebook.com>
Date:	Thu, 12 Nov 2015 14:42:09 -0800
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	Yang Shi <yang.shi@...aro.org>
Cc:	ast@...nel.org, daniel@...earbox.net, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH] bpf: samples: exclude asm/sysreg.h for arm64

On Thu, Nov 12, 2015 at 02:07:46PM -0800, Yang Shi wrote:
> commit 338d4f49d6f7114a017d294ccf7374df4f998edc
> ("arm64: kernel: Add support for Privileged Access Never") includes sysreg.h
> into futex.h and uaccess.h. But, the inline assembly used by asm/sysreg.h is
> incompatible with llvm so it will cause BPF samples build failure for ARM64.
> Since sysreg.h is useless for BPF samples, just exclude it from Makefile via
> defining __ASM_SYSREG_H.
> 
> Signed-off-by: Yang Shi <yang.shi@...aro.org>

not the prettiest fix, but good enough for sample code.
Acked-by: Alexei Starovoitov <ast@...nel.org>

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