linux-kernel - Re: [PATCH] perf arm64: Fix mksyscalltbl when system kernel headers are ahead of the kernel

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Message-ID: <20190521132838.GB26253@kernel.org>
Date:   Tue, 21 May 2019 10:28:38 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Vitaly Chikunov <vt@...linux.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Hendrik Brueckner <brueckner@...ux.ibm.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Kim Phillips <kim.phillips@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Subject: Re: [PATCH] perf arm64: Fix mksyscalltbl when system kernel headers
 are ahead of the kernel

Em Tue, May 21, 2019 at 06:02:03AM +0300, Vitaly Chikunov escreveu:
> When a host system has kernel headers that are newer than a compiling
> kernel, mksyscalltbl fails with errors such as:
> 
>   <stdin>: In function 'main':
>   <stdin>:271:44: error: '__NR_kexec_file_load' undeclared (first use in this function)
>   <stdin>:271:44: note: each undeclared identifier is reported only once for each function it appears in
>   <stdin>:272:46: error: '__NR_pidfd_send_signal' undeclared (first use in this function)
>   <stdin>:273:43: error: '__NR_io_uring_setup' undeclared (first use in this function)
>   <stdin>:274:43: error: '__NR_io_uring_enter' undeclared (first use in this function)
>   <stdin>:275:46: error: '__NR_io_uring_register' undeclared (first use in this function)
>   tools/perf/arch/arm64/entry/syscalls//mksyscalltbl: line 48: /tmp/create-table-xvUQdD: Permission denied
> 
> mksyscalltbl is compiled with default host includes, but run with

It shouldn't :-\ So with this you're making it use the ones shipped in
tools/include? Good, I'll test it, thanks!

- Arnaldo

> compiling kernel tree includes, causing some syscall numbers being
> undeclared.
> 
> Signed-off-by: Vitaly Chikunov <vt@...linux.org>
> Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> Cc: Hendrik Brueckner <brueckner@...ux.ibm.com>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Kim Phillips <kim.phillips@....com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
> ---
>  tools/perf/arch/arm64/entry/syscalls/mksyscalltbl | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/arch/arm64/entry/syscalls/mksyscalltbl b/tools/perf/arch/arm64/entry/syscalls/mksyscalltbl
> index c88fd32563eb..459469b7222c 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  $input	       \
> +$gcc -E -dM -x c -I $incpath/include/uapi $input \
>  	|sed -ne 's/^#define __NR_//p' \
>  	|sort -t' ' -k2 -nu	       \
>  	|create_table
> -- 
> 2.11.0

-- 

- Arnaldo