linux-kernel - Re: [PATCH v3 08/11] powerpc/tracing: fix compat syscall handling

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Date:   Wed, 12 Oct 2016 20:59:42 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Marcin Nowakowski <marcin.nowakowski@...tec.com>,
        linux-kernel@...r.kernel.org
Cc:     linux-api@...r.kernel.org, luto@...capital.net,
        rostedt@...dmis.org,
        Marcin Nowakowski <marcin.nowakowski@...tec.com>,
        Ingo Molnar <mingo@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v3 08/11] powerpc/tracing: fix compat syscall handling

Marcin Nowakowski <marcin.nowakowski@...tec.com> writes:

> Adapt the code to make use of new syscall handling interface
>
> Signed-off-by: Marcin Nowakowski <marcin.nowakowski@...tec.com>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: linuxppc-dev@...ts.ozlabs.org
> ---
>  arch/powerpc/include/asm/ftrace.h | 11 +++++++++++
>  arch/powerpc/kernel/ftrace.c      |  4 ++++

I went to test this and noticed the exit and enter events appear to be
reversed in time? (your series on top of 24532f768121)

  ls-4221  [003] ....    83.766113: compat_sys_rt_sigprocmask -> 0x2
  ls-4221  [003] ....    83.766137: compat_sys_rt_sigprocmask(how: 2, nset: 1010db30, oset: 0, sigsetsize: 8)
  ls-4221  [003] ....    83.766175: compat_sys_rt_sigaction -> 0x14
  ls-4221  [003] ....    83.766175: compat_sys_rt_sigaction(sig: 14, act: ffbd33c4, oact: ffbd3338, sigsetsize: 8)
  ls-4221  [003] ....    83.766177: compat_sys_rt_sigaction -> 0x15
  ls-4221  [003] ....    83.766177: compat_sys_rt_sigaction(sig: 15, act: ffbd33c4, oact: ffbd3338, sigsetsize: 8)
  ls-4221  [003] ....    83.766178: compat_sys_rt_sigaction -> 0x16
  ls-4221  [003] ....    83.766178: compat_sys_rt_sigaction(sig: 16, act: ffbd33d4, oact: ffbd3348, sigsetsize: 8)
  ls-4221  [003] ....    83.766179: sys_setpgid -> 0x107d
  ls-4221  [003] ....    83.766179: sys_setpgid(pid: 107d, pgid: 107d)
  ls-4221  [003] ....    83.766180: compat_sys_rt_sigprocmask -> 0x0
  ls-4221  [003] ....    83.766181: compat_sys_rt_sigprocmask(how: 0, nset: ffbd34b0, oset: ffbd3530, sigsetsize: 8)
  ls-4221  [003] ....    83.766186: compat_sys_ioctl -> 0xff
  ls-4221  [003] ....    83.766187: compat_sys_ioctl(fd: ff, cmd: 80047476, arg32: ffbd3488)
  ls-4221  [003] ....    83.766188: compat_sys_rt_sigprocmask -> 0x2
  ls-4221  [003] ....    83.766189: compat_sys_rt_sigprocmask(how: 2, nset: ffbd3530, oset: 0, sigsetsize: 8)
  ls-4221  [003] ....    83.766189: sys_close -> 0x4
  ls-4221  [003] ....    83.766190: sys_close(fd: 4)
  ls-4221  [003] ....    83.766191: sys_read -> 0x3
  ls-4221  [003] ....    83.766191: sys_read(fd: 3, buf: ffbd35dc, count: 1)
  ls-4221  [003] ....    83.766235: sys_close -> 0x3
  ls-4221  [003] ....    83.766235: sys_close(fd: 3)

cheers