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[35.247.103.198]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-30516fed6f4sm9502139a91.32.2025.04.01.09.36.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Apr 2025 09:36:23 -0700 (PDT) Date: Tue, 1 Apr 2025 09:36:19 -0700 From: William McVicker To: John Stultz Cc: Catalin Marinas , Will Deacon , Peter Griffin , =?iso-8859-1?Q?Andr=E9?= Draszik , Tudor Ambarus , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Alim Akhtar , Daniel Lezcano , Thomas Gleixner , Saravana Kannan , Krzysztof Kozlowski , kernel-team@android.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org, Hosung Kim Subject: Re: [PATCH v1 3/6] clocksource/drivers/exynos_mct: Set local timer interrupts as percpu Message-ID: References: <20250331230034.806124-1-willmcvicker@google.com> <20250331230034.806124-4-willmcvicker@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250401_093625_626404_D8305312 X-CRM114-Status: GOOD ( 17.00 ) 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 03/31/2025, John Stultz wrote: > On Mon, Mar 31, 2025 at 4:00 PM 'Will McVicker' via kernel-team > wrote: > > > > From: Hosung Kim > > > > The MCT local timers can be used as a per-cpu event timer. To prevent > > Can be used, or are used? If it's an option, is this change important > in both cases? > > > the timer interrupts from migrating to other CPUs, set the flag > > IRQF_PERCPU. > > Might be work expanding this a bit to clarify why the interrupts > migrating to other cpus is undesired. Let me dig into this further to figure out if the IP has a limitation where the interrupts need to be handled by the CPU the timer was triggered on or if this is just an optimization. Any chance you know this @Youngmin? Thanks, Will > > > Signed-off-by: Hosung Kim > > [Original commit from https://android.googlesource.com/kernel/gs/+/03267fad19f093bac979ca78309483e9eb3a8d16] > > Signed-off-by: Will McVicker > > thanks! > -john