linux-kernel - Re: [PATCH REPOST 1/5] thread_info: Port core code to use update_thread

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Date:   Fri, 11 May 2018 11:33:38 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Dave Martin <Dave.Martin@....com>
Cc:     linux-kernel@...r.kernel.org, Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        "David S. Miller" <davem@...emloft.net>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Oleg Nesterov <oleg@...hat.com>, linux-arch@...r.kernel.org
Subject: Re: [PATCH REPOST 1/5] thread_info: Port core code to use
 update_thread_flag() helpers

On Fri, 11 May 2018 16:05:00 +0100
Dave Martin <Dave.Martin@....com> wrote:

> This patch ports a couple of relevant bits of the core kernel to
> use the new update_thread_flag() helpers.
> 
> No functional change.
> 
> Signed-off-by: Dave Martin <Dave.Martin@....com>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Oleg Nesterov <oleg@...hat.com>
> ---
>  include/trace/syscall.h |  6 ++----
>  kernel/ptrace.c         | 13 +++++--------
>  2 files changed, 7 insertions(+), 12 deletions(-)
> 
> diff --git a/include/trace/syscall.h b/include/trace/syscall.h
> index dc8ac27..dcc9bdf 100644
> --- a/include/trace/syscall.h
> +++ b/include/trace/syscall.h
> @@ -37,10 +37,8 @@ struct syscall_metadata {
>  #if defined(CONFIG_TRACEPOINTS) && defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
>  static inline void syscall_tracepoint_update(struct task_struct *p)
>  {
> -	if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
> -		set_tsk_thread_flag(p, TIF_SYSCALL_TRACEPOINT);
> -	else
> -		clear_tsk_thread_flag(p, TIF_SYSCALL_TRACEPOINT);
> +	update_tsk_thread_flag(p, TIF_SYSCALL_TRACEPOINT,
> +			       test_thread_flag(TIF_SYSCALL_TRACEPOINT));
>  }

Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

-- Steve

>  #else
>  static inline void syscall_tracepoint_update(struct task_struct *p)
> diff --git a/kernel/ptrace.c b/kernel/ptrace.c
> index 21fec73..7a2bd8d 100644
> --- a/kernel/ptrace.c
> +++ b/kernel/ptrace.c
> @@ -785,16 +785,13 @@ static int ptrace_resume(struct task_struct *child, long request,
>  	if (!valid_signal(data))
>  		return -EIO;
>  
> -	if (request == PTRACE_SYSCALL)
> -		set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
> -	else
> -		clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
> +	update_tsk_thread_flag(child, TIF_SYSCALL_TRACE,
> +			       request == PTRACE_SYSCALL);
>  
>  #ifdef TIF_SYSCALL_EMU
> -	if (request == PTRACE_SYSEMU || request == PTRACE_SYSEMU_SINGLESTEP)
> -		set_tsk_thread_flag(child, TIF_SYSCALL_EMU);
> -	else
> -		clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
> +	update_tsk_thread_flag(child, TIF_SYSCALL_EMU,
> +			       request == PTRACE_SYSEMU ||
> +			       request == PTRACE_SYSEMU_SINGLESTEP);
>  #endif
>  
>  	if (is_singleblock(request)) {