From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yonghong Song Subject: [PATCH bpf-next v3 1/7] perf/core: add perf_get_event() to return perf_event given a struct file Date: Tue, 22 May 2018 09:30:45 -0700 Message-ID: <20180522163048.3128924-2-yhs@fb.com> References: <20180522163048.3128924-1-yhs@fb.com> Mime-Version: 1.0 Content-Type: text/plain Cc: To: , , , Return-path: Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:58628 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751726AbeEVQav (ORCPT ); Tue, 22 May 2018 12:30:51 -0400 Received: from pps.filterd (m0044012.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w4MGUSGf000637 for ; Tue, 22 May 2018 09:30:50 -0700 Received: from mail.thefacebook.com ([199.201.64.23]) by mx0a-00082601.pphosted.com with ESMTP id 2j4nku086x-12 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT) for ; Tue, 22 May 2018 09:30:50 -0700 In-Reply-To: <20180522163048.3128924-1-yhs@fb.com> Sender: netdev-owner@vger.kernel.org List-ID: 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: Yonghong Song --- include/linux/perf_event.h | 5 +++++ kernel/events/core.c | 8 ++++++++ 2 files changed, 13 insertions(+) diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index e71e99e..eec302b 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -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); diff --git a/kernel/events/core.c b/kernel/events/core.c index 67612ce..6eeab86 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -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) -- 2.9.5