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Sun, 30 Nov 2025 18:33:58 +0000 Date: Sun, 30 Nov 2025 18:33:58 +0000 Message-ID: <875xarfjzd.wl-maz@kernel.org> From: Marc Zyngier To: Vincent Donnefort Cc: rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, linux-trace-kernel@vger.kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, jstultz@google.com, qperret@google.com, will@kernel.org, aneesh.kumar@kernel.org, kernel-team@android.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH v8 24/28] KVM: arm64: Add trace reset to the pKVM hyp In-Reply-To: <20251107093840.3779150-25-vdonnefort@google.com> References: <20251107093840.3779150-1-vdonnefort@google.com> <20251107093840.3779150-25-vdonnefort@google.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: vdonnefort@google.com, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, linux-trace-kernel@vger.kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, jstultz@google.com, qperret@google.com, will@kernel.org, aneesh.kumar@kernel.org, kernel-team@android.com, linux-kernel@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, 07 Nov 2025 09:38:36 +0000, Vincent Donnefort wrote: > [...] > +int __pkvm_reset_tracing(unsigned int cpu) > +{ > + int ret = 0; > + > + if (cpu >= hyp_nr_cpus) > + return -EINVAL; > + > + hyp_spin_lock(&trace_buffer.lock); > + > + if (hyp_trace_buffer_loaded(&trace_buffer)) > + ret = simple_ring_buffer_reset(per_cpu_ptr(trace_buffer.simple_rbs, cpu)); > + else > + ret = -ENODEV; > + > + hyp_spin_unlock(&trace_buffer.lock); > + > + return ret; nit; there is no case where the 'ret' default value can be used. Either drop the init or make it so that the default value is meaningful (-ENODEV). Thanks, M. -- Jazz isn't dead. It just smells funny.