Re: [PATCH 08/17] ptrace/m68k: Stop open coding ptrace_report_syscall

On Mon, Jan 3, 2022 at 10:33 PM Eric W. Biederman [off-list ref] wrote:

The generic function ptrace_report_syscall does a little more
than syscall_trace on m68k.  The function ptrace_report_syscall
stops early if PT_TRACED is not set, it sets ptrace_message,
and returns the result of fatal_signal_pending.

Setting ptrace_message to a passed in value of 0 is effectively not
setting ptrace_message, making that additional work a noop.

Returning the result of fatal_signal_pending and letting the caller
ignore the result becomes a noop in this change.

When a process is ptraced, the flag PT_PTRACED is always set in
current->ptrace.  Testing for PT_PTRACED in ptrace_report_syscall is
just an optimization to fail early if the process is not ptraced.
Later on in ptrace_notify, ptrace_stop will test current->ptrace under
tasklist_lock and skip performing any work if the task is not ptraced.

Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: "Eric W. Biederman" <redacted>

As this depends on the removal of a parameter from
ptrace_report_syscall() earlier in this series:
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds