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Subject: Re: [PATCH 1/2] perf arm64: Handle __NR3264_ prefixed syscall number
To:     Alexander Kapshuk <alexander.kapshuk@gmail.com>
References: <1684837327-18203-1-git-send-email-yangtiezhu@loongson.cn>
 <1684837327-18203-2-git-send-email-yangtiezhu@loongson.cn>
 <CAJ1xhMUZoO66b=LNVnjBN1GbHvXdo2b2y+YeONC36Ok=Xn5XFg@mail.gmail.com>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        Ian Rogers <irogers@google.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Hans-Peter Nilsson <hp@axis.com>, Leo Yan <leo.yan@linaro.org>,
        linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
        loongarch@lists.linux.dev, loongson-kernel@lists.loongnix.cn
From:   Tiezhu Yang <yangtiezhu@loongson.cn>
Message-ID: <49e98308-ab8d-5811-66a8-9e17f22bb8c4@loongson.cn>
Date:   Wed, 24 May 2023 11:19:04 +0800
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On 05/23/2023 08:31 PM, Alexander Kapshuk wrote:
> On Tue, May 23, 2023 at 1:22 PM Tiezhu Yang <yangtiezhu@loongson.cn> wrote:
>>
>> After commit 9854e7ad35fe ("perf arm64: Simplify mksyscalltbl"),
>> in the generated syscall table file syscalls.c, there exist some
>> __NR3264_ prefixed syscall numbers such as [__NR3264_ftruncate],
>> it looks like not so good, just do some small filter operations
>> to handle __NR3264_ prefixed syscall number as a digital number.
>>
>> Without this patch:
>>
>>   [__NR3264_ftruncate] = "ftruncate",
>>
>> With this patch:
>>
>>   [46] = "ftruncate",
>>
>> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
>> ---
>>  tools/perf/arch/arm64/entry/syscalls/mksyscalltbl | 7 ++++---
>>  1 file changed, 4 insertions(+), 3 deletions(-)
>>
>> diff --git a/tools/perf/arch/arm64/entry/syscalls/mksyscalltbl b/tools/perf/arch/arm64/entry/syscalls/mksyscalltbl
>> index 22cdf91..59ab7939 100755
>> --- a/tools/perf/arch/arm64/entry/syscalls/mksyscalltbl
>> +++ b/tools/perf/arch/arm64/entry/syscalls/mksyscalltbl
>> @@ -39,7 +39,8 @@ create_table()
>>         echo "};"
>>  }
>>
>> -$gcc -E -dM -x c -I $incpath/include/uapi $input \
>> -       |sed -ne 's/^#define __NR_//p' \
>> -       |sort -t' ' -k2 -n             \
>> +$gcc -E -dM -x c -I $incpath/include/uapi $input               \
>> +       |awk '{if ($2~"__NR" && $3 !~"__NR3264_") {print}}'     \
>> +       |sed -ne 's/^#define __NR_//p;s/^#define __NR3264_//p'  \
>> +       |sort -t' ' -k2 -n                                      \
>>         |create_table
>> --
>> 2.1.0
>>
>
> As an aside, the awk + sed + sort parts of the command line may be
> reduced to the following awk script, if desired:
> awk '$2 ~ "__NR" && $3 !~ "__NR3264_" {
>         sub("^#define __NR_", "")
>         sub("^#define __NR3264_", "")
>         print | "sort -k2 -n"
> }'
>

Hi Alexander,

Thanks, it seems more simple and works well as expected.
Let us wait for more review comments before respin.

If no any objections, I will send v2 with the following
changes based on the current patch in the next week.

-$gcc -E -dM -x c -I $incpath/include/uapi $input               \
-       |awk '{if ($2~"__NR" && $3 !~"__NR3264_") {print}}'     \
-       |sed -ne 's/^#define __NR_//p;s/^#define __NR3264_//p'  \
-       |sort -t' ' -k2 -n                                      \
+$gcc -E -dM -x c -I $incpath/include/uapi $input \
+       |awk '$2 ~ "__NR" && $3 !~ "__NR3264_" {
+               sub("^#define __NR_", "")
+               sub("^#define __NR3264_", "")
+               print | "sort -k2 -n"}' \
         |create_table

Thanks,
Tiezhu