Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753415AbbKCIKd (ORCPT ); Tue, 3 Nov 2015 03:10:33 -0500 Received: from mail-pa0-f65.google.com ([209.85.220.65]:35290 "EHLO mail-pa0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752595AbbKCIKb (ORCPT ); Tue, 3 Nov 2015 03:10:31 -0500 From: Caesar Wang To: Russell King , Heiko Stuebner Cc: hl@rock-chips.com, sjg@chromium.org, Jonathan Stone , dianders@chromium.org, linux-rockchip@lists.infradead.org, cwz@rock-chips.com, Caesar Wang , Ard Biesheuvel , Gregory CLEMENT , Stephen Boyd , linux-kernel@vger.kernel.org, Huang Tao , Thomas Petazzoni , Nadav Haklai , linux-arm-kernel@lists.infradead.org Subject: [RESEND PATCH 0/1] Fix the "hard LOCKUP" when running a heavy loading Date: Tue, 3 Nov 2015 16:10:08 +0800 Message-Id: <1446538209-13490-1-git-send-email-wxt@rock-chips.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1631 Lines: 49 As the following log: where we experience a CPU hard lockup. The assembly code (disassembled by gdb) 0xc06c6e90 <__tcp_select_window+148>: beq 0xc06c6eb0<__tcp_select_window+180> 0xc06c6e94 <__tcp_select_window+152>: mov r2, #1008; 0x3f0 0xc06c6e98 <__tcp_select_window+156>: ldr r5, [r0,#1004] ; 0x3ec 0xc06c6e9c <__tcp_select_window+160>: ldrh r2, [r0,r2] .... 0xc06c6ee0 <__tcp_select_window+228>: addne r0, r0, #1 0xc06c6ee4 <__tcp_select_window+232>: lslne r0, r0, r2 0xc06c6ee8 <__tcp_select_window+236>: ldmne sp, {r4, r5,r11, sp,pc} Could either the “strhi”/”strlo” pair, or the lslne/ldmne pair, be tripping over errata 818325, or a similar errata? 0xc06c6eec <__tcp_select_window+240>: b 0xc06c6f40<__tcp_select_window+324> This is patch can fix the *hard lock* in some case. As the Russell said: "in other words, which can be handled by updating a control register in the firmware or boot loader" Maybe the better solution is in firmware. Others, I'm no sure this workaround patch if can be accepted. I resend this patch for getting some suggestion from you. -- Thanks! Huang Tao (1): ARM: errata: Workaround for Cortex-A12 erratum 818325 arch/arm/Kconfig | 13 +++++++++++++ arch/arm/mm/proc-v7.S | 12 ++++++++++++ 2 files changed, 25 insertions(+) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/