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Sat, 07 Feb 2026 22:25:36 +0000 Date: Sat, 07 Feb 2026 22:25:29 +0000 Message-ID: <86zf5kb38m.wl-maz@kernel.org> From: Marc Zyngier To: Thomas Gleixner Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Robin Murphy , stable@vger.kernel.org Subject: Re: [PATCH] irqchip/gic-v3-its: Limit number of per-device MSIs to the range the ITS supports In-Reply-To: <87h5rsb64v.ffs@tglx> References: <20260206154816.3582887-1-maz@kernel.org> <87h5rsb64v.ffs@tglx> 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: tglx@kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, robin.murphy@arm.com, stable@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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260207_142542_766553_3B25262B X-CRM114-Status: GOOD ( 18.15 ) 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 Sat, 07 Feb 2026 21:22:56 +0000, Thomas Gleixner wrote: > > On Fri, Feb 06 2026 at 15:48, Marc Zyngier wrote: > > > The ITS driver blindly assumes that EventIDs are in abundant supply, > > to the point where it never checks how many the HW actually supports. > > > > It turns out that some pretty esoteric integrations make it so that > > only a few bits are available, all the way down to a. single. bit. > > > > Enforce the advertised limitation at the point of allocating the > > device structure, and hope that the endpoint driver can deal with > > such limitation. > > > > Signed-off-by: Marc Zyngier > > Cc: stable@vger.kernel.org > > Can you please provide a Fixes tag? That'd be Fixes: 84a6a2e7fc18d ("irqchip: GICv3: ITS: device allocation and configuration") Thanks, M. -- Without deviation from the norm, progress is not possible.