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[209.132.180.67]) by mx.google.com with ESMTP id j11si4375611plb.253.2018.11.27.09.41.52; Tue, 27 Nov 2018 09:42:26 -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; 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 S1731858AbeK1Eg4 (ORCPT + 99 others); Tue, 27 Nov 2018 23:36:56 -0500 Received: from pegase1.c-s.fr ([93.17.236.30]:46640 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726288AbeK1Eg4 (ORCPT ); Tue, 27 Nov 2018 23:36:56 -0500 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 4349x42kKlz9v0C0; Tue, 27 Nov 2018 18:38:16 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id cXrQIJ-qd4lY; Tue, 27 Nov 2018 18:38:16 +0100 (CET) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 4349x423g9z9v0BP; Tue, 27 Nov 2018 18:38:16 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id BA3208B83D; Tue, 27 Nov 2018 18:38:17 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id UgaH0SuN8gZx; Tue, 27 Nov 2018 18:38:17 +0100 (CET) Received: from po14163vm.idsi0.si.c-s.fr (unknown [192.168.232.3]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 7FFB08B827; Tue, 27 Nov 2018 18:38:17 +0100 (CET) Received: by po14163vm.idsi0.si.c-s.fr (Postfix, from userid 0) id B520269AE1; Tue, 27 Nov 2018 17:38:16 +0000 (UTC) Message-Id: <674bef4f0b56492b4c30644ccaaf318869c84992.1543340240.git.christophe.leroy@c-s.fr> From: Christophe Leroy Subject: [PATCH] powerpc/8xx: add exception frame marker To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Date: Tue, 27 Nov 2018 17:38:16 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds STACK_FRAME_REGS_MARKER in the stack at exception entry in order to see interrupts in call traces as below: [ 0.013964] Call Trace: [ 0.014014] [c0745db0] [c007a9d4] tick_periodic.constprop.5+0xd8/0x104 (unreliable) [ 0.014086] [c0745dc0] [c007aa20] tick_handle_periodic+0x20/0x9c [ 0.014181] [c0745de0] [c0009cd0] timer_interrupt+0xa0/0x264 [ 0.014258] [c0745e10] [c000e484] ret_from_except+0x0/0x14 [ 0.014390] --- interrupt: 901 at console_unlock.part.7+0x3f4/0x528 [ 0.014390] LR = console_unlock.part.7+0x3f0/0x528 [ 0.014455] [c0745ee0] [c0050334] console_unlock.part.7+0x114/0x528 (unreliable) [ 0.014542] [c0745f30] [c00524e0] register_console+0x3d8/0x44c [ 0.014625] [c0745f60] [c0675aac] cpm_uart_console_init+0x18/0x2c [ 0.014709] [c0745f70] [c06614f4] console_init+0x114/0x1cc [ 0.014795] [c0745fb0] [c0658b68] start_kernel+0x300/0x3d8 [ 0.014864] [c0745ff0] [c00022cc] start_here+0x44/0x98 Signed-off-by: Christophe Leroy --- arch/powerpc/kernel/head_8xx.S | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S index 3b67b9533c82..5e72df2031cb 100644 --- a/arch/powerpc/kernel/head_8xx.S +++ b/arch/powerpc/kernel/head_8xx.S @@ -149,6 +149,9 @@ turn_on_mmu: li r10,MSR_KERNEL & ~(MSR_IR|MSR_DR); /* can take exceptions */ \ mtmsr r10; \ stw r0,GPR0(r11); \ + lis r10, STACK_FRAME_REGS_MARKER@ha; /* exception frame marker */ \ + addi r10, r10, STACK_FRAME_REGS_MARKER@l; \ + stw r10, 8(r11); \ SAVE_4GPRS(3, r11); \ SAVE_2GPRS(7, r11) -- 2.13.3