[PATCH v2 1/7] perf: Move set_filter() from behind EVENT_TRACING

Alexander Shishkin
2016-04-27T15:46:21Z

For instruction trace filtering, namely, for communicating filter
definitions from userspace, I'd like to re-use the SET_FILTER code
that the tracepoints are using currently.

To that end, this patch moves the relevant code from behind EVENT_TRACING
macro.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
---
kernel/events/core.c | 45 ++++++++++++++++++++++-----------------------
1 file changed, 22 insertions(+), 23 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index eabeb2aec0..aa3733fc76 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7244,24 +7244,6 @@ static inline void perf_tp_register(void)
perf_pmu_register(&perf_tracepoint, "tracepoint", PERF_TYPE_TRACEPOINT);
}

-static int perf_event_set_filter(struct perf_event *event, void __user *arg)
-{
- char *filter_str;
- int ret;
-
- if (event->attr.type != PERF_TYPE_TRACEPOINT)
- return -EINVAL;
-
- filter_str = strndup_user(arg, PAGE_SIZE);
- if (IS_ERR(filter_str))
- return PTR_ERR(filter_str);
-
- ret = ftrace_profile_set_filter(event, event->attr.config, filter_str);
-
- kfree(filter_str);
- return ret;
-}
-
static void perf_event_free_filter(struct perf_event *event)
{
ftrace_profile_free_filter(event);
@@ -7316,11 +7298,6 @@ static inline void perf_tp_register(void)
{
}

-static int perf_event_set_filter(struct perf_event *event, void __user *arg)
-{
- return -ENOENT;
-}
-
static void perf_event_free_filter(struct perf_event *event)
{
}
@@ -7348,6 +7325,28 @@ void perf_bp_event(struct perf_event *bp, void *data)
}
#endif

+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))
+ return -EINVAL;
+
+ 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);
+
+ kfree(filter_str);
+ return ret;
+}
+
/*
* hrtimer based swevent callback
*/
--
2.8.0.rc3