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[209.132.180.67]) by mx.google.com with ESMTP id n14si1545935plp.257.2019.02.11.06.34.51; Mon, 11 Feb 2019 06:35:07 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=Hebwc0Bl; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730612AbfBKOdP (ORCPT + 99 others); Mon, 11 Feb 2019 09:33:15 -0500 Received: from mail.kernel.org ([198.145.29.99]:40802 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730578AbfBKOdJ (ORCPT ); Mon, 11 Feb 2019 09:33:09 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8088C214DA; Mon, 11 Feb 2019 14:33:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549895589; bh=dJ3lfC9OhfehczZFP5NjJLcAhCLUd4EWZixlyG2oAQk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Hebwc0BliNq2MPCKAzIm2sQm/5kSOS2IFE+9fOJ+H1in1xfRdCNFL0GllJhWITBny eukA36YVnYUGF94fBcRHLzQBtvrc5nEtSwA9qWNKHrLVg/3BGf12iXRx4tPeoZpleB RqsYkkM7ni0nIh9PCMXqkgWtRghj2LPk4DvlkEqs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stefan Roese , Paul Burton , John Crispin , Daniel Schwierzeck , Ralf Baechle , linux-mips@linux-mips.org, Sasha Levin Subject: [PATCH 4.20 256/352] MIPS: ralink: Select CONFIG_CPU_MIPSR2_IRQ_VI on MT7620/8 Date: Mon, 11 Feb 2019 15:18:03 +0100 Message-Id: <20190211141903.372203898@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190211141846.543045703@linuxfoundation.org> References: <20190211141846.543045703@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 0b15394475e3bcaf35ca4bf22fc55d56df67224e ] Testing has shown, that when using mainline U-Boot on MT7688 based boards, the system may hang or crash while mounting the root-fs. The main issue here is that mainline U-Boot configures EBase to a value near the end of system memory. And with CONFIG_CPU_MIPSR2_IRQ_VI disabled, trap_init() will not allocate a new area to place the exception handler. The original value will be used and the handler will be copied to this location, which might already be used by some userspace application. The MT7688 supports VI - its config3 register is 0x00002420, so VInt (Bit 5) is set. But without setting CONFIG_CPU_MIPSR2_IRQ_VI this bit will not be evaluated to result in "cpu_has_vi" being set. This patch now selects CONFIG_CPU_MIPSR2_IRQ_VI on MT7620/8 which results trap_init() to allocate some memory for the exception handler. Please note that this issue was not seen with the Mediatek U-Boot version, as it does not touch EBase (stays at default of 0x8000.0000). This is strictly also not correct as the kernel (_text) resides here. Signed-off-by: Stefan Roese [paul.burton@mips.com: s/beeing/being/] Signed-off-by: Paul Burton Cc: John Crispin Cc: Daniel Schwierzeck Cc: Ralf Baechle Cc: linux-mips@linux-mips.org Signed-off-by: Sasha Levin --- arch/mips/ralink/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/mips/ralink/Kconfig b/arch/mips/ralink/Kconfig index 1f9cb0e3c79a..613d61763433 100644 --- a/arch/mips/ralink/Kconfig +++ b/arch/mips/ralink/Kconfig @@ -38,6 +38,7 @@ choice config SOC_MT7620 bool "MT7620/8" + select CPU_MIPSR2_IRQ_VI select HW_HAS_PCI config SOC_MT7621 -- 2.19.1