From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 94CB83F44DC for ; Tue, 14 Jul 2026 14:53:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784040820; cv=none; b=OE+vYUHVAvcrWwFyhkS4HUDWTOr+0GFcZMcpFVhAmxDYPHI3/TwLBK1742WicJ2pvNnFLluHppgmvSFMRRsSkOHsNep45Yi5jJfgbIbDGdQFRv63J0PGJOHZpYms9G2psUGh0tXpDzRVTScY0gZPtI4hB8knEpaj8pt6uONupL0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784040820; c=relaxed/simple; bh=WEIw0fgWpPB71/k/+bezzxEWip5daZ04k8Q2wCyf2ng=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=nEGPDlZyVcNzKbbcpyzAPdWRiCh7l31pQR/hwpg1LzEsgQhl45fLJcgiZpIsGDAeYOYRUGbPszpaacibWO8nwFTvLoGRspEvVEZii+w2aADDsfV6g5qvNUxzf4bsl60kpJ5onMJ0qCA5ErmrJer5yrMttiklSGdVRat7fUbj/YQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Qp9fsMIJ; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Qp9fsMIJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A13981F00A3A; Tue, 14 Jul 2026 14:53:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784040816; bh=Q+Wrpcjla9Ei5z8cE8vFLPyKQgxDrL3Vp14FnCcXsOo=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=Qp9fsMIJHu30YcwzTWGU6jUOQTfQSaAyEkFyVZFPus9D+m8ZhLDkd+mVng9TRFgk8 tTMisBURjNgvguPc1OIU6KK6hxWHjhvb3EQ7ZfVm5J9Pp834PE2dC5/hHfowVGKkdF PlPpskHn3zXoOUCMGH0ELwcpDNeMPhjfhcb5o0t8Jtqv1K38KFJoqdYrcFSkF+7RAD yCb2GEtsgoxOn8ZzDnGnKHAm0Zmuxs1Qu0bTl5iPbho+0CMQZDU0QnGQx7arqxeDog IJIPof3dMoMM3yus7y5Q+6/f5OtWiZjALqy4HwccCLAt6suzuv+JOOhvViIzpqZJxL UoXLMPkFd3unA== Received: from sofa.misterjones.org ([185.219.108.64] helo=goblin-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1wjeVq-00000004xBb-35Ux; Tue, 14 Jul 2026 14:53:34 +0000 Date: Tue, 14 Jul 2026 15:53:34 +0100 Message-ID: <86jyqxoc5t.wl-maz@kernel.org> From: Marc Zyngier To: Haofeng Li <920484857@qq.com> Cc: tglx@kernel.org, linux-kernel@vger.kernel.org, Haofeng Li <13266079573@163.com>, Haofeng Li , Sudeep Holla , Vikram Sethi , Shanker Donthineni , linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 15/16] irqchip/gic-v3: fail T241 quirk if alias ioremap fails In-Reply-To: References: <20260714122351.3274006-1-lihaofeng@kylinos.cn> <20260714132453.3302672-1-920484857@qq.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) Precedence: bulk X-Mailing-List: linux-kernel@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: 185.219.108.64 X-SA-Exim-Rcpt-To: 920484857@qq.com, tglx@kernel.org, linux-kernel@vger.kernel.org, 13266079573@163.com, lihaofeng@kylinos.cn, sudeep.holla@kernel.org, vsethi@nvidia.com, sdonthineni@nvidia.com, linux-arm-kernel@lists.infradead.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, 14 Jul 2026 14:24:51 +0100, Haofeng Li <920484857@qq.com> wrote: > > From: Haofeng Li > > NVIDIA T241 GICD alias setup only warns about a failed ioremap, then > enables gic_nvidia_t241_erratum. Later accesses through the missing > alias can dereference NULL. There won't be any later accesses, the machine is *dead*, short of reliably handle interrupts. The only thing this patch is doing is giving a false sense of having fixed something, while it is far worse than the existing situation. Please tell that to your LLM. M. -- Without deviation from the norm, progress is not possible.