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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 C402E30A77B6D; Mon, 12 Jun 2023 11:38:48 +0200 (CEST) Message-ID: <20230612093540.108251860@infradead.org> User-Agent: quilt/0.66 Date: Mon, 12 Jun 2023 11:07:49 +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 36/57] perf: Simplify find_get_pmu_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 | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -4757,11 +4757,14 @@ find_get_context(struct task_struct *tas return ERR_PTR(err); } +/* + * Returns a matching perf_event_pmu_context with elevated refcount or NULL. + */ static struct perf_event_pmu_context * find_get_pmu_context(struct pmu *pmu, struct perf_event_context *ctx, struct perf_event *event) { - struct perf_event_pmu_context *new = NULL, *epc; + struct perf_event_pmu_context *epc; void *task_ctx_data = NULL; if (!ctx->task) { @@ -4788,16 +4791,14 @@ find_get_pmu_context(struct pmu *pmu, st return epc; } - new = kzalloc(sizeof(*epc), GFP_KERNEL); + void *new __free(kfree) = kzalloc(sizeof(*epc), GFP_KERNEL); if (!new) - return ERR_PTR(-ENOMEM); + return NULL; if (event->attach_state & PERF_ATTACH_TASK_DATA) { task_ctx_data = alloc_task_ctx_data(pmu); - if (!task_ctx_data) { - kfree(new); - return ERR_PTR(-ENOMEM); - } + if (!task_ctx_data) + return NULL; } __perf_init_event_pmu_context(new, pmu); @@ -4820,8 +4821,7 @@ find_get_pmu_context(struct pmu *pmu, st } } - epc = new; - new = NULL; + epc = no_free_ptr(new); list_add(&epc->pmu_ctx_entry, &ctx->pmu_ctx_list); epc->ctx = ctx; @@ -4835,7 +4835,6 @@ find_get_pmu_context(struct pmu *pmu, st raw_spin_unlock_irq(&ctx->lock); free_task_ctx_data(pmu, task_ctx_data); - kfree(new); return epc; }