From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 941B01DF727; Tue, 28 Jan 2025 08:46:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738054014; cv=none; b=bpl48F1EvHKdQy9GCgUyfqvNgmkURcar8BiqvpS23poIFAuTmzvwS2HKpOXFhIAU91yoN7GQpElbT/2/P4Ux/KuKdkn5ANwcLyvfVZhVmZ/7rAX+A89aJNwqGcZuqERObResJYZeW3tLh6K1OCzPB6+u435+xGvuaW8nqOigciQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738054014; c=relaxed/simple; bh=NIaz5G/YTf25Ttjt+0raODscJ3FM7qyN7v0o8c7XgZQ=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=fzn6rMyIKgPsjfW1vDhJejUFt+I/tHEN7oA1FaBacJ2/L8UceIKCdmiv9/K+edlUDI3BdLQfHRPU3BdT8KDaUEGwIWyCAY7E3TTedtK/Hjd73f9xAl3uxAU++jS0vOc3AVG4T4kTeYm9QDyqRKlEHoWWm6JH3tPcQzsKVpnh96I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AB7UVHu8; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="AB7UVHu8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F41DCC4CEE2; Tue, 28 Jan 2025 08:46:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1738054013; bh=NIaz5G/YTf25Ttjt+0raODscJ3FM7qyN7v0o8c7XgZQ=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=AB7UVHu81b10Z0wUWZ1IIrwljei30sZmzzxVZOIyiW9mlKqpCTPKFjX4zJJ9LAHch Of22JI+hNBufiNRDvlFUtxW4IL/rcLV5iiXoOpQ1BPIUhmcE1ZCI5T8f4cmksVeGZr lSTKgOnWXCEFdRHwx1OhDVtXtmPOPKqnCXwHWOEdWQ//J9cMEnukfyGqWf9GXDcB4e cUStfBTKlNDoW3MOxnnJ2Yq4b+abhgpXDmXgxlQqE7BqCi169yHE8PjSter4jwjuyz 7MkM73kyA/8y5Y9zE6wl+XhApA9LsjclObu7utHlhAJ8ZTSceJLHnvJIuJw10hCwO5 sEk2DknZ71qfw== Received: from 82-132-233-27.dab.02.net ([82.132.233.27] helo=wait-a-minute.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1tchFC-00FzcD-DD; Tue, 28 Jan 2025 08:46:50 +0000 Date: Tue, 28 Jan 2025 08:46:48 +0000 Message-ID: <87jzaftjev.wl-maz@kernel.org> From: Marc Zyngier To: Oliver Upton Cc: linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Hanjun Guo , Sudeep Holla , Will Deacon , Catalin Marinas , Lorenzo Pieralisi , Zheng Zengkai , stable@vger.kernel.org Subject: Re: [PATCH] ACPI: GTDT: Relax sanity checking on Platform Timers array count In-Reply-To: <20250128001749.3132656-1-oliver.upton@linux.dev> References: <20250128001749.3132656-1-oliver.upton@linux.dev> 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/29.4 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 82.132.233.27 X-SA-Exim-Rcpt-To: oliver.upton@linux.dev, linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, guohanjun@huawei.com, sudeep.holla@arm.com, will@kernel.org, catalin.marinas@arm.com, lpieralisi@kernel.org, zhengzengkai@huawei.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 On Tue, 28 Jan 2025 00:17:49 +0000, Oliver Upton wrote: > > Perhaps unsurprisingly there are some platforms where the GTDT isn't > quite right and the Platforms Timer array overflows the length of the > overall table. Colour me shocked! Broken ACPI tables? [insert REM song here]. > > While the recently-added sanity checking isn't wrong, it makes it > impossible to boot the kernel on offending platforms. Try to hobble > along and limit the Platform Timer count to the bounds of the table. > > Cc: Marc Zyngier > Cc: Lorenzo Pieralisi > Cc: Zheng Zengkai > Cc: stable@vger.kernel.org > Fixes: 263e22d6bd1f ("ACPI: GTDT: Tighten the check for the array of platform timer structures") > Signed-off-by: Oliver Upton Acked-by: Marc Zyngier M. -- Without deviation from the norm, progress is not possible.