From patchwork Mon Feb 15 12:20:07 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 8314061 X-Patchwork-Delegate: horms@verge.net.au Return-Path: X-Original-To: patchwork-linux-renesas-soc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 91C71C02AA for ; Mon, 15 Feb 2016 12:20:22 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id DACA4201F5 for ; Mon, 15 Feb 2016 12:20:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 07C9E20494 for ; Mon, 15 Feb 2016 12:20:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752939AbcBOMUR (ORCPT ); Mon, 15 Feb 2016 07:20:17 -0500 Received: from laurent.telenet-ops.be ([195.130.137.89]:36269 "EHLO laurent.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753176AbcBOMUO (ORCPT ); Mon, 15 Feb 2016 07:20:14 -0500 Received: from ayla.of.borg ([84.195.106.123]) by laurent.telenet-ops.be with bizsmtp id JcLA1s0042fm56U01cLA2m; Mon, 15 Feb 2016 13:20:12 +0100 Received: from ramsan.of.borg ([192.168.97.29] helo=ramsan) by ayla.of.borg with esmtp (Exim 4.82) (envelope-from ) id 1aVI8P-00009N-VV; Mon, 15 Feb 2016 13:20:09 +0100 Received: from geert by ramsan with local (Exim 4.82) (envelope-from ) id 1aVI8Q-0001md-JZ; Mon, 15 Feb 2016 13:20:10 +0100 From: Geert Uytterhoeven To: Simon Horman , Magnus Damm Cc: Russell King , Kees Cook , Nicolas Pitre , linux-renesas-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Geert Uytterhoeven Subject: [PATCH v3 1/2] ARM: shmobile: Move shmobile_smp_{mpidr, fn, arg}[] from .text to .bss Date: Mon, 15 Feb 2016 13:20:07 +0100 Message-Id: <1455538808-6816-2-git-send-email-geert+renesas@glider.be> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1455538808-6816-1-git-send-email-geert+renesas@glider.be> References: <1455538808-6816-1-git-send-email-geert+renesas@glider.be> Sender: linux-renesas-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP If CONFIG_DEBUG_RODATA=y, the kernel crashes during system suspend: Freezing user space processes ... (elapsed 0.004 seconds) done. Freezing remaining freezable tasks ... (elapsed 0.002 seconds) done. PM: suspend of devices complete after 111.948 msecs PM: late suspend of devices complete after 1.086 msecs PM: noirq suspend of devices complete after 11.576 msecs Disabling non-boot CPUs ... Kernel panic - not syncing: Attempted to kill the idle task! 1014ec ---[ end Kernel panic - not syncing: Attempted to kill the idle task! CPU0: stopping This happens because the .text section is marked read-only, while the arrays shmobile_smp_mpidr[], shmobile_smp_fn[], and shmobile_smp_arg[] are being written to. Fix this by moving these arrays from the .text to the .bss section. This requires accessing them through PC-relative offsets. Signed-off-by: Geert Uytterhoeven Reviewed-by: Kees Cook Reviewed-by: Nicolas Pitre --- v3: - Use .bss instead of .data, as requested by Nicolas Pitre , - Add Reviewed-by, v2: - Add Reviewed-by, - Store offsets instead of pointers, as suggested by Nicolas Pitre . --- arch/arm/mach-shmobile/headsmp.S | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/arch/arm/mach-shmobile/headsmp.S b/arch/arm/mach-shmobile/headsmp.S index 330c1fc63197df89..94d86ed164144cdf 100644 --- a/arch/arm/mach-shmobile/headsmp.S +++ b/arch/arm/mach-shmobile/headsmp.S @@ -50,9 +50,11 @@ ENTRY(shmobile_smp_boot) mrc p15, 0, r1, c0, c0, 5 @ r1 = MPIDR and r0, r1, r0 @ r0 = cpu_logical_map() value mov r1, #0 @ r1 = CPU index - adr r5, 1f @ array of per-cpu mpidr values - adr r6, 2f @ array of per-cpu functions - adr r7, 3f @ array of per-cpu arguments + adr r2, 1f + ldmia r2, {r5, r6, r7} + add r5, r5, r2 @ array of per-cpu mpidr values + add r6, r6, r2 @ array of per-cpu functions + add r7, r7, r2 @ array of per-cpu arguments shmobile_smp_boot_find_mpidr: ldr r8, [r5, r1, lsl #2] @@ -80,12 +82,18 @@ ENTRY(shmobile_smp_sleep) b shmobile_smp_boot ENDPROC(shmobile_smp_sleep) + .align 2 +1: .long shmobile_smp_mpidr - . + .long shmobile_smp_fn - 1b + .long shmobile_smp_arg - 1b + + .bss .globl shmobile_smp_mpidr shmobile_smp_mpidr: -1: .space NR_CPUS * 4 + .space NR_CPUS * 4 .globl shmobile_smp_fn shmobile_smp_fn: -2: .space NR_CPUS * 4 + .space NR_CPUS * 4 .globl shmobile_smp_arg shmobile_smp_arg: -3: .space NR_CPUS * 4 + .space NR_CPUS * 4