linux-kernel - Re: [perf bench syscall] c5ba0666d8: perf-sanity-tests.perf.make

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Date:   Wed, 5 Oct 2022 22:05:41 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     kernel test robot <yujie.liu@...el.com>
Cc:     lkp@...ts.01.org, lkp@...el.com, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [perf bench syscall] c5ba0666d8: perf-sanity-tests.perf.make_fail


On 10/5/22 16:35, kernel test robot wrote:
> Greeting,
> 
> FYI, we noticed the following commit (built with gcc-11):
> 
> commit: c5ba0666d8f6dd34cb07ad45804e6a90159d377f ("[PATCH v2 1/3] perf bench syscall: Introduce bench_syscall_common()")
> url: https://github.com/intel-lab-lkp/linux/commits/Tiezhu-Yang/perf-Add-more-syscalls-to-benchmark/20220929-165832
> base: https://git.kernel.org/cgit/linux/kernel/git/acme/linux.git perf/core
> patch link: https://lore.kernel.org/lkml/1664441571-31349-2-git-send-email-yangtiezhu@loongson.cn
> 
> in testcase: perf-sanity-tests
> version: perf-x86_64-b357fd1c2afc-1_20221001
> with following parameters:
> 
> 	perf_compiler: gcc
> 
> 
> on test machine: 8 threads 1 sockets Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz (Kaby Lake) with 32G memory
> 
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
> 
> 
>    CC      bench/syscall.o
> bench/syscall.c: In function ‘bench_syscall_common’:
> bench/syscall.c:47:8: error: ‘__NR_getppid’ undeclared (first use in this function); did you mean ‘__getpgid’?
>     47 |   case __NR_getppid:
>        |        ^~~~~~~~~~~~
>        |        __getpgid
> bench/syscall.c:47:8: note: each undeclared identifier is reported only once for each function it appears in
> bench/syscall.c: In function ‘bench_syscall_basic’:
> bench/syscall.c:102:42: error: ‘__NR_getppid’ undeclared (first use in this function); did you mean ‘__getpgid’?
>    102 |  return bench_syscall_common(argc, argv, __NR_getppid);
>        |                                          ^~~~~~~~~~~~
>        |                                          __getpgid
> bench/syscall.c:103:1: error: control reaches end of non-void function [-Werror=return-type]
>    103 | }
>        | ^
> cc1: all warnings being treated as errors
> 
> 
> If you fix the issue, kindly add following tag
> | Reported-by: kernel test robot <yujie.liu@...el.com>
> | Link: https://lore.kernel.org/r/202210051644.a83a7ca4-yujie.liu@intel.com
> 
> 
> To reproduce:
> 
>          git clone https://github.com/intel/lkp-tests.git
>          cd lkp-tests
>          sudo bin/lkp install job.yaml           # job file is attached in this email
>          bin/lkp split-job --compatible job.yaml # generate the yaml file for lkp run
>          sudo bin/lkp run generated-yaml-file
> 
>          # if come across any failure that blocks the test,
>          # please remove ~/.lkp and /lkp dir to run from a clean state.
> 
> 

I am sorry for the build issues.

In my opinion, include asm/unistd.h can fix the build error about
undeclared __NR_getppid reported by kernel test robot, and this is
what I did in the v2 patch, but it seems no effect.

Here are the definition on my x86_64 system:

[yangtiezhu@...ux ~]$ grep -rn __NR_getppid /usr/include/
/usr/include/asm/unistd_x32.h:102:#define __NR_getppid 
(__X32_SYSCALL_BIT + 110)
/usr/include/asm/unistd_32.h:68:#define __NR_getppid 64
/usr/include/asm/unistd_64.h:114:#define __NR_getppid 110
/usr/include/asm-generic/unistd.h:492:#define __NR_getppid 173
/usr/include/asm-generic/unistd.h:493:__SYSCALL(__NR_getppid, sys_getppid)
/usr/include/bits/syscall.h:610:#ifdef __NR_getppid
/usr/include/bits/syscall.h:611:# define SYS_getppid __NR_getppid
[yangtiezhu@...ux ~]$ cat /usr/include/asm/unistd.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _ASM_X86_UNISTD_H
#define _ASM_X86_UNISTD_H

/* x32 syscall flag bit */
#define __X32_SYSCALL_BIT	0x40000000

# ifdef __i386__
#  include <asm/unistd_32.h>
# elif defined(__ILP32__)
#  include <asm/unistd_x32.h>
# else
#  include <asm/unistd_64.h>
# endif

#endif /* _ASM_X86_UNISTD_H */
[yangtiezhu@...ux ~]$ rpm -qf /usr/include/asm/unistd.h
kernel-headers-4.18.0-348.7.1.el8_5.x86_64

In order to fix the build error,

(1) Maybe I need to add the following code like
tools/build/feature/test-bpf.c:

#ifndef __NR_getppid
# if defined(__i386__)
#  define __NR_getppid 64
# elif defined(__x86_64__)
#  define __NR_getppid 110
# elif defined(__aarch64__)
...
# elif defined(__sparc__)
...
# elif defined(__s390__)
...
# elif defined(__mips__)
...
# else
#  error __NR_getppid not defined.
# endif
#endif

(2) Maybe I need to modify the following header files:
tools/arch/x86/include/uapi/asm/unistd_32.h
tools/arch/x86/include/uapi/asm/unistd_64.h

I prefer the second method, but I am a bit confused,
why not include /usr/include/asm/unistd*.h?
I think it is to avoid cross build issues?
Am I missing something?

Let me rethink it and then send v3, thank you.

Thanks,
Tiezhu