linux-kernel - Re: [PATCH] perf arm64: Use local headers for target compiler

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Date:   Thu, 21 Mar 2019 13:39:17 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Daniel Thompson <daniel.thompson@...aro.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Kim Phillips <kim.phillips@....com>,
        linux-kernel@...r.kernel.org, patches@...aro.org
Subject: Re: [PATCH] perf arm64: Use local headers for target compiler

Em Thu, Mar 21, 2019 at 04:13:53PM +0000, Daniel Thompson escreveu:
> Currently the set of available syscalls is generated from the
> target compilers default <asm-generic/unistd.h>
> (i.e. /usr/include/asm-generic/unistd.h on a self-hosted system).

It shouldn't, Kim?

> The numeric values are then generated by the host compiler using
> tools/include/uapi/asm/unistd.h .
> 
> This leads to some nasty version skew problems (including failed perf
> builds if you are running a bleeding edge distro and want to build an
> older version of perf for testing).
> 
> Let's make the target compiler use the local headers too.
> 
> Signed-off-by: Daniel Thompson <daniel.thompson@...aro.org>
> ---
>  tools/perf/arch/arm64/entry/syscalls/mksyscalltbl | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/arch/arm64/entry/syscalls/mksyscalltbl b/tools/perf/arch/arm64/entry/syscalls/mksyscalltbl
> index c88fd32563eb..1aca6a839e4f 100755
> --- a/tools/perf/arch/arm64/entry/syscalls/mksyscalltbl
> +++ b/tools/perf/arch/arm64/entry/syscalls/mksyscalltbl
> @@ -56,7 +56,7 @@ create_table()
>  	echo "};"
>  }
> 
> -$gcc -E -dM -x c  $input	       \
> -	|sed -ne 's/^#define __NR_//p' \
> -	|sort -t' ' -k2 -nu	       \
> +$gcc -I $incpath/include/uapi -E -dM -x c  $input \
> +	|sed -ne 's/^#define __NR_//p'		  \
> +	|sort -t' ' -k2 -nu			  \
>  	|create_table
> --
> 2.20.1

-- 

- Arnaldo