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Commit f8d959a5 authored by Yonghong Song's avatar Yonghong Song Committed by Alexei Starovoitov
Browse files

perf/core: add perf_get_event() to return perf_event given a struct file 



A new extern function, perf_get_event(), is added to return a perf event
given a struct file. This function will be used in later patches.

Signed-off-by: default avatarYonghong Song <yhs@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 31ad3923

include/linux/perf_event.h

+5 −0
Original line number Diff line number Diff line
@@ -868,6 +868,7 @@ extern void perf_event_exit_task(struct task_struct *child); 
extern void perf_event_free_task(struct task_struct *task);

extern void perf_event_delayed_put(struct task_struct *task);

extern struct file *perf_event_get(unsigned int fd);

extern const struct perf_event *perf_get_event(struct file *file);

extern const struct perf_event_attr *perf_event_attrs(struct perf_event *event);

extern void perf_event_print_debug(void);

extern void perf_pmu_disable(struct pmu *pmu);
@@ -1289,6 +1290,10 @@ static inline void perf_event_exit_task(struct task_struct *child) { } 
static inline void perf_event_free_task(struct task_struct *task)	{ }

static inline void perf_event_delayed_put(struct task_struct *task)	{ }

static inline struct file *perf_event_get(unsigned int fd)	{ return ERR_PTR(-EINVAL); }

static inline const struct perf_event *perf_get_event(struct file *file)

{

	return ERR_PTR(-EINVAL);

}

static inline const struct perf_event_attr *perf_event_attrs(struct perf_event *event)

{

	return ERR_PTR(-EINVAL);

kernel/events/core.c

+8 −0
Original line number Diff line number Diff line
@@ -11212,6 +11212,14 @@ struct file *perf_event_get(unsigned int fd) 
	return file;

}



const struct perf_event *perf_get_event(struct file *file)

{

	if (file->f_op != &perf_fops)

		return ERR_PTR(-EINVAL);



	return file->private_data;

}



const struct perf_event_attr *perf_event_attrs(struct perf_event *event)

{

	if (!event)