linux-kernel - Re: [GIT PULL] tracing: A couple of minor fixes

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Date:   Mon, 21 Oct 2019 15:13:48 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        Prateek Sood <prsood@...eaurora.org>
Subject: Re: [GIT PULL] tracing: A couple of minor fixes

On Mon, 21 Oct 2019 12:45:08 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> Linus,
> 

Hi Linus,

Please hold off on this. Someone just pointed out to me that one of the
change logs has a bunch of crap attached to it that shouldn't be
committed.

I need to rebase (just the change logs, so no retesting is needed).

I'll go and delete this tag and create a new (different one) when
ready.

-- Steve


> Two minor fixes:
> 
>  - A race in perf trace initialization (missing mutexes)
> 
>  - Minor fix to represent gfp_t in synthetic events as properly signed
> 
> 
> Please pull the latest trace-v5.4-rc3 tree, which can be found at:
> 
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
> trace-v5.4-rc3
> 
> Tag SHA1: 46467c95be6062b0c66aae0efbab5746bee09f1e
> Head SHA1: 668993e5696ddc5db01940d66818c7c038895893
> 
> 
> Prateek Sood (1):
>       tracing: Fix race in perf_trace_buf initialization
> 
> Zhengjun Xing (1):
>       tracing: Fix "gfp_t" format for synthetic events
> 
> ----
>  kernel/trace/trace_event_perf.c  | 4 ++++
>  kernel/trace/trace_events_hist.c | 2 ++
>  2 files changed, 6 insertions(+)
> ---------------------------
> diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
> index 0892e38ed6fb..a9dfa04ffa44 100644
> --- a/kernel/trace/trace_event_perf.c
> +++ b/kernel/trace/trace_event_perf.c
> @@ -272,9 +272,11 @@ int perf_kprobe_init(struct perf_event *p_event, bool is_retprobe)
>  		goto out;
>  	}
>  
> +	mutex_lock(&event_mutex);
>  	ret = perf_trace_event_init(tp_event, p_event);
>  	if (ret)
>  		destroy_local_trace_kprobe(tp_event);
> +	mutex_unlock(&event_mutex);
>  out:
>  	kfree(func);
>  	return ret;
> @@ -282,8 +284,10 @@ int perf_kprobe_init(struct perf_event *p_event, bool is_retprobe)
>  
>  void perf_kprobe_destroy(struct perf_event *p_event)
>  {
> +	mutex_lock(&event_mutex);
>  	perf_trace_event_close(p_event);
>  	perf_trace_event_unreg(p_event);
> +	mutex_unlock(&event_mutex);
>  
>  	destroy_local_trace_kprobe(p_event->tp_event);
>  }
> diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
> index 57648c5aa679..7482a1466ebf 100644
> --- a/kernel/trace/trace_events_hist.c
> +++ b/kernel/trace/trace_events_hist.c
> @@ -679,6 +679,8 @@ static bool synth_field_signed(char *type)
>  {
>  	if (str_has_prefix(type, "u"))
>  		return false;
> +	if (strcmp(type, "gfp_t") == 0)
> +		return false;
>  
>  	return true;
>  }