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Mon, 12 Jun 2023 11:38:53 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id D03BE30A77B70; Mon, 12 Jun 2023 11:38:48 +0200 (CEST) Message-ID: <20230612093540.253514702@infradead.org> User-Agent: quilt/0.66 Date: Mon, 12 Jun 2023 11:07:51 +0200 From: Peter Zijlstra To: torvalds@linux-foundation.org, keescook@chromium.org, gregkh@linuxfoundation.org, pbonzini@redhat.com Cc: masahiroy@kernel.org, nathan@kernel.org, ndesaulniers@google.com, nicolas@fjasle.eu, catalin.marinas@arm.com, will@kernel.org, vkoul@kernel.org, trix@redhat.com, ojeda@kernel.org, peterz@infradead.org, mingo@redhat.com, longman@redhat.com, boqun.feng@gmail.com, dennis@kernel.org, tj@kernel.org, cl@linux.com, acme@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, namhyung@kernel.org, irogers@google.com, adrian.hunter@intel.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, paulmck@kernel.org, frederic@kernel.org, quic_neeraju@quicinc.com, joel@joelfernandes.org, josh@joshtriplett.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, rientjes@google.com, vbabka@suse.cz, roman.gushchin@linux.dev, 42.hyeyoo@gmail.com, apw@canonical.com, joe@perches.com, dwaipayanray1@gmail.com, lukas.bulwahn@gmail.com, john.johansen@canonical.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, llvm@lists.linux.dev, linux-perf-users@vger.kernel.org, rcu@vger.kernel.org, linux-security-module@vger.kernel.org, tglx@linutronix.de, ravi.bangoria@amd.com, error27@gmail.com, luc.vanoostenryck@gmail.com Subject: [PATCH v3 38/57] perf: Simplify IOC_SET_OUTPUT References: <20230612090713.652690195@infradead.org> MIME-Version: 1.0 Precedence: bulk List-ID: Signed-off-by: Peter Zijlstra (Intel) --- kernel/events/core.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -5762,6 +5762,11 @@ static inline struct fd perf_fdget(int f return f; } +static inline bool is_perf_fd(struct fd fd) +{ + return fd.file && fd.file->f_op == &perf_fops; +} + static int perf_event_set_output(struct perf_event *event, struct perf_event *output_event); static int perf_event_set_filter(struct perf_event *event, void __user *arg); @@ -5807,19 +5812,15 @@ static long _perf_ioctl(struct perf_even case PERF_EVENT_IOC_SET_OUTPUT: { - int ret; if (arg != -1) { struct perf_event *output_event; - struct fd output = perf_fdget(arg); - if (!output.file) + CLASS(fd, output)(arg); + if (!is_perf_fd(output)) return -EBADF; output_event = output.file->private_data; - ret = perf_event_set_output(event, output_event); - fdput(output); - } else { - ret = perf_event_set_output(event, NULL); + return perf_event_set_output(event, output_event); } - return ret; + return perf_event_set_output(event, NULL); } case PERF_EVENT_IOC_SET_FILTER: