linux-kernel - Re: [PATCH v5 3/6] perf: implement pmu perf

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Message-ID: <20171220101426.cquh5uv4bgj4bk7y@hirez.programming.kicks-ass.net>
Date:   Wed, 20 Dec 2017 11:14:26 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Song Liu <songliubraving@...com>
Cc:     rostedt@...dmis.org, mingo@...hat.com, davem@...emloft.net,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        daniel@...earbox.net, kernel-team@...com
Subject: Re: [PATCH v5 3/6] perf: implement pmu perf_kprobe

On Wed, Dec 20, 2017 at 11:03:01AM +0100, Peter Zijlstra wrote:
> On Wed, Dec 06, 2017 at 02:45:15PM -0800, Song Liu wrote:
> > @@ -8537,7 +8620,7 @@ static int perf_event_set_filter(struct perf_event *event, void __user *arg)
> >  	char *filter_str;
> >  	int ret = -EINVAL;
> >  
> > -	if ((event->attr.type != PERF_TYPE_TRACEPOINT ||
> > +	if ((!perf_event_is_tracing(event) ||
> >  	     !IS_ENABLED(CONFIG_EVENT_TRACING)) &&
> >  	    !has_addr_filter(event))
> >  		return -EINVAL;
> 
> You actually missed an instance later in this same function... fixing
> that.


@@ -8518,23 +8601,19 @@ perf_event_set_addr_filter(struct perf_e
 
 static int perf_event_set_filter(struct perf_event *event, void __user *arg)
 {
-	char *filter_str;
 	int ret = -EINVAL;
-
-	if ((event->attr.type != PERF_TYPE_TRACEPOINT ||
-	    !IS_ENABLED(CONFIG_EVENT_TRACING)) &&
-	    !has_addr_filter(event))
-		return -EINVAL;
+	char *filter_str;
 
 	filter_str = strndup_user(arg, PAGE_SIZE);
 	if (IS_ERR(filter_str))
 		return PTR_ERR(filter_str);
 
-	if (IS_ENABLED(CONFIG_EVENT_TRACING) &&
-	    event->attr.type == PERF_TYPE_TRACEPOINT)
-		ret = ftrace_profile_set_filter(event, event->attr.config,
-						filter_str);
-	else if (has_addr_filter(event))
+#ifdef CONFIG_EVENT_TRACING
+	if (perf_event_is_tracing(event))
+		ret = ftrace_profile_set_filter(event, event->attr.config, filter_str);
+	else
+#endif
+	if (has_addr_filter(event))
 		ret = perf_event_set_addr_filter(event, filter_str);
 
 	kfree(filter_str);



Is that right?