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Thu, 05 Mar 2026 11:03:18 +0000 Date: Thu, 05 Mar 2026 11:03:17 +0000 Message-ID: <86qzpy7d3e.wl-maz@kernel.org> From: Marc Zyngier To: Konrad Dybcio Cc: Geert Uytterhoeven , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Peter Griffin , =?UTF-8?B?QW5kcsOp?= Draszik , Tudor Ambarus , Alim Akhtar , Frank Li , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Dinh Nguyen , Bjorn Andersson , Konrad Dybcio , Thierry Reding , linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-samsung-soc@vger.kernel.org, imx@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/7] arm64: dts: Drop CPU masks from GICv3 PPI interrupts In-Reply-To: <24685144-c1bb-4084-80de-40989efbf4a1@oss.qualcomm.com> References: <24685144-c1bb-4084-80de-40989efbf4a1@oss.qualcomm.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: konrad.dybcio@oss.qualcomm.com, geert@linux-m68k.org, neil.armstrong@linaro.org, khilman@baylibre.com, jbrunet@baylibre.com, martin.blumenstingl@googlemail.com, peter.griffin@linaro.org, andre.draszik@linaro.org, tudor.ambarus@linaro.org, alim.akhtar@samsung.com, Frank.Li@nxp.com, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, dinguyen@kernel.org, andersson@kernel.org, konradybcio@kernel.org, treding@nvidia.com, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-samsung-soc@vger.kernel.org, imx@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-renesas-soc@vger.kernel.org, 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 Thu, 05 Mar 2026 10:02:01 +0000, Konrad Dybcio wrote: > > On 3/5/26 10:55 AM, Geert Uytterhoeven wrote: > > Hi Konrad, > > > > On Thu, 5 Mar 2026 at 10:33, Konrad Dybcio > > wrote: > >> On 3/4/26 6:10 PM, Geert Uytterhoeven wrote: > >>> Unlike older GIC variants, the GICv3 DT bindings do not support > >>> specifying a CPU mask in PPI interrupt specifiers. Hence this patch > >>> series drop all such masks where they are still present. > >> > >> I'm having trouble finding where that's used on pre-v3 even.. does > >> that actually get processed on the older iterations? > > > > I had noticed the same, and had asked maz on IRC. > > His answer: > > > > "so far, we have never seen a GICv{1,2} system that didn't have all > > of its PPIs > > connected to the same set of devices." > > lol, that's fun! For some definition of fun. If you want to get a top-class headache, have a look at what that means to handle a single INTID being routed different drivers based on the *affinity* of the interrupt. HW people who come up with these contraptions should be spanked repeatedly and preferably asymmetrically. N, -- Without deviation from the norm, progress is not possible.