From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4F7F8FE5215 for ; Fri, 24 Apr 2026 12:21:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Rc7qdqKLMXxIfh21Cj8Dl8AVMepmlB0Fv8KgJ5hmvnU=; b=aAn+V6FeZezIpAC2IGbaO5Izhp RYO7OlmAuMJhzOkDtg+iu9+1vw19Vty3j3oj2idgJUuQve2m527QsSDiNnB5pE+f00r1MhBH8BrW+ YZVRE3PEcE/JTP5+Ty2OhAq9amGJoqCNXWWlpv7MibunrcN3qgq4zSNAVO4g3zNCV8t9puGyQajBr uKIyKeDwzvprToErru7QfsoAkvlgSX94TijvClIgnu9rGbrRbcGlf/YUju4Nh78jgzpzmlW2Y96Pu h+1rkHiYrjGNNKaR5YS2skEZGitXsDTmAVPlnbnsTKH7nLgDYRtqeAqa38LSW/QXRidV4xB7HPeWt DYEqxKTw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wGFXc-0000000DAoJ-1njZ; Fri, 24 Apr 2026 12:21:52 +0000 Received: from pandora.armlinux.org.uk ([2001:4d48:ad52:32c8:5054:ff:fe00:142]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wGFXZ-0000000DAnq-2PvZ for linux-arm-kernel@lists.infradead.org; Fri, 24 Apr 2026 12:21:51 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=Rc7qdqKLMXxIfh21Cj8Dl8AVMepmlB0Fv8KgJ5hmvnU=; b=h1b50Q8PW0ReBCtuZX5A4AsCra CM5IRJK+L8oh2qAmLsB8oD3qKc8vo4cAriH8yXOByV9cB1QCVwLsdEjDGeeIbMzdG59PVn1XSkwDM XD8GISvSMv/pvxFED9j3dPtxvcfViwc8IqQo+QyCRzheMHSJh9YznE/dMz858x1effMhxOs17EMvb GPogOtMCIH+n3mMICIfHC8BHkOODUEJ/pMTTWhDRFicu1w2pfbSERJoyRwDfJOAezncfxN+YksmRT 81ckclJi8YjUAHVE2Mrj1rAxCSccgtgkJt/FHR6CoCOfNR9xE2SJhCglK6J95TYxfqqFMZaF5LtT7 BvUEBxDw==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:48656) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1wGFXR-000000003FY-2I2c; Fri, 24 Apr 2026 13:21:41 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.98.2) (envelope-from ) id 1wGFXO-000000002WO-3Wvf; Fri, 24 Apr 2026 13:21:38 +0100 Date: Fri, 24 Apr 2026 13:21:38 +0100 From: "Russell King (Oracle)" To: Maninder Singh Cc: linus.walleij@linaro.org, ardb@kernel.org, ndesaulniers@google.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/1] arm: traps: remove fp underflow checking Message-ID: References: <20260424043029.4101133-1-maninder1.s@samsung.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260424043029.4101133-1-maninder1.s@samsung.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260424_052149_896457_08FD3329 X-CRM114-Status: GOOD ( 12.21 ) 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 Fri, Apr 24, 2026 at 10:00:29AM +0530, Maninder Singh wrote: > with IRQSTACKS fp can point outside of thread's stack. > And when there is crash reported from IRQ side, it always report > "frame pointer underflow", which is not real underflow. > > Unhandled fault: page domain fault (0x81b) at 0x00000000 > .. > PC is at handle_irq_desc+0x68/0xa4 > LR is at generic_handle_domain_irq+0x18/0x1c > .. > > Call trace: frame pointer underflow > handle_irq_desc from generic_handle_domain_irq+0x18/0x1c > generic_handle_domain_irq from gic_handle_irq+0x78/0x8c > gic_handle_irq from generic_handle_arch_irq+0x3c/0x4c > .. > > It is just warning print and there is no decision based on this > to stop backtrack or etc. So it can be removed. Please find a way to check whether the frame pointer is within the IRQ stack rather than removing this. Thanks. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!