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helo=foss.arm.com; envelope-from=robin.murphy@arm.com; receiver=lists.ozlabs.org) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lists.ozlabs.org (Postfix) with ESMTP id 4c5r2P6xxPz3d3M for ; Tue, 19 Aug 2025 23:26:21 +1000 (AEST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8CEF116A3; Tue, 19 Aug 2025 06:25:42 -0700 (PDT) Received: from [10.1.196.50] (e121345-lin.cambridge.arm.com [10.1.196.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 884583F738; Tue, 19 Aug 2025 06:25:46 -0700 (PDT) Message-ID: <271daf71-3c57-49a5-a65f-c58ac670864f@arm.com> Date: Tue, 19 Aug 2025 14:25:45 +0100 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 19/19] perf: Garbage-collect event_init checks From: Robin Murphy To: peterz@infradead.org, mingo@redhat.com, will@kernel.org, mark.rutland@arm.com, acme@kernel.org, namhyung@kernel.org, alexander.shishkin@linux.intel.com, jolsa@kernel.org, irogers@google.com, adrian.hunter@intel.com, kan.liang@linux.intel.com Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, imx@lists.linux.dev, linux-csky@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-pm@vger.kernel.org, linux-rockchip@lists.infradead.org, dmaengine@vger.kernel.org, linux-fpga@vger.kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, coresight@lists.linaro.org, iommu@lists.linux.dev, linux-amlogic@lists.infradead.org, linux-cxl@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-riscv@lists.infradead.org References: Content-Language: en-GB In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 13/08/2025 6:01 pm, Robin Murphy wrote: [...] > diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c > index 297ff5adb667..98ffab403bb4 100644 > --- a/arch/x86/events/intel/uncore.c > +++ b/arch/x86/events/intel/uncore.c > @@ -731,24 +731,11 @@ static int uncore_pmu_event_init(struct perf_event *event) > struct hw_perf_event *hwc = &event->hw; > int ret; > > - if (event->attr.type != event->pmu->type) > - return -ENOENT; > - > pmu = uncore_event_to_pmu(event); > /* no device found for this pmu */ > if (!pmu->registered) > return -ENOENT; > > - /* Sampling not supported yet */ > - if (hwc->sample_period) > - return -EINVAL; > - > - /* > - * Place all uncore events for a particular physical package > - * onto a single cpu > - */ > - if (event->cpu < 0) > - return -EINVAL; Oopsie, I missed that this isn't just the usual boilerplate as the comment kind of implies, but is also necessary to prevent the uncore_pmu_to_box() lookup going wrong (since the core code won't reject a task-bound event until later). I'll put this back with an updated comment for v2 (and double-check everything else again...), thanks LKP! Robin. > box = uncore_pmu_to_box(pmu, event->cpu); > if (!box || box->cpu < 0) > return -EINVAL;