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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 4309930A7A2A1; Mon, 12 Jun 2023 11:38:49 +0200 (CEST) Message-ID: <20230612093541.669724890@infradead.org> User-Agent: quilt/0.66 Date: Mon, 12 Jun 2023 11:08:10 +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 57/57] perf: Simplify perf_install_in_context() References: <20230612090713.652690195@infradead.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org Signed-off-by: Peter Zijlstra (Intel) --- kernel/events/core.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -2876,7 +2876,7 @@ perf_install_in_context(struct perf_even if (!task_function_call(task, __perf_install_in_context, event)) return; - raw_spin_lock_irq(&ctx->lock); + guard(raw_spinlock_irq)(&ctx->lock); task = ctx->task; if (WARN_ON_ONCE(task == TASK_TOMBSTONE)) { /* @@ -2884,19 +2884,15 @@ perf_install_in_context(struct perf_even * cannot happen), and we hold ctx->mutex, which serializes us * against perf_event_exit_task_context(). */ - raw_spin_unlock_irq(&ctx->lock); return; } /* * If the task is not running, ctx->lock will avoid it becoming so, * thus we can safely install the event. */ - if (task_curr(task)) { - raw_spin_unlock_irq(&ctx->lock); + if (task_curr(task)) goto again; - } add_event_to_ctx(event, ctx); - raw_spin_unlock_irq(&ctx->lock); } /*