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 X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9A5B0C282DD for ; Thu, 18 Apr 2019 18:02:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6C6D42186A for ; Thu, 18 Apr 2019 18:02:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1555610538; bh=pj6N8vdzpjJMU5Uwd3puO4kVlKg6z/6NSKsMWc1MAZQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ewyzz2rZR+lNkUdbykZvQeACFM4WHQS6LjE79lwpWddqo2S0fJ08HDuiu82wiiGhB D3pv6lvxtXEjU9fEW+QBRYoBTBQ+lGlrq0H91bOoa5fqHclf1YwO3s1Hj2OZZ31bjT 6uu5UrTfBILfjEyXo5xPMwLP29Vzzdn3oo5xp/08= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390730AbfDRSCR (ORCPT ); Thu, 18 Apr 2019 14:02:17 -0400 Received: from mail.kernel.org ([198.145.29.99]:58312 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390719AbfDRSCO (ORCPT ); Thu, 18 Apr 2019 14:02:14 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.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 858D3217FA; Thu, 18 Apr 2019 18:02:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1555610534; bh=pj6N8vdzpjJMU5Uwd3puO4kVlKg6z/6NSKsMWc1MAZQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=U1IIrkQaV+Lsso3agfy4+FM7i7SGwhu9vHWNpCyZsaKoKxCHrfBldISgE+r8p4ppc m6PcRD8Rviuc655lv+JZ2aFK72B4GmaBuPOioLMxN2lYFjuZ5SNdFtRlvRp6C1VG6T QqjGJ4WPwW3ytrzEzOY/odUPfbKmXabh9Iy2/Uvs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Yang Shi , Sebastian Andrzej Siewior , Arnd Bergmann , Russell King , Sasha Levin Subject: [PATCH 4.19 099/110] ARM: 8839/1: kprobe: make patch_lock a raw_spinlock_t Date: Thu, 18 Apr 2019 19:57:28 +0200 Message-Id: <20190418160447.091039334@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190418160437.484158340@linuxfoundation.org> References: <20190418160437.484158340@linuxfoundation.org> User-Agent: quilt/0.66 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 [ Upstream commit 143c2a89e0e5fda6c6fd08d7bc1126438c19ae90 ] When running kprobe on -rt kernel, the below bug is caught: |BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:931 |in_atomic(): 1, irqs_disabled(): 128, pid: 14, name: migration/0 |Preemption disabled at:[<802f2b98>] cpu_stopper_thread+0xc0/0x140 |CPU: 0 PID: 14 Comm: migration/0 Tainted: G O 4.8.3-rt2 #1 |Hardware name: Freescale LS1021A |[<8025a43c>] (___might_sleep) |[<80b5b324>] (rt_spin_lock) |[<80b5c31c>] (__patch_text_real) |[<80b5c3ac>] (patch_text_stop_machine) |[<802f2920>] (multi_cpu_stop) Since patch_text_stop_machine() is called in stop_machine() which disables IRQ, sleepable lock should be not used in this atomic context, so replace patch_lock to raw lock. Signed-off-by: Yang Shi Signed-off-by: Sebastian Andrzej Siewior Reviewed-by: Arnd Bergmann Signed-off-by: Russell King Signed-off-by: Sasha Levin --- arch/arm/kernel/patch.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/arm/kernel/patch.c b/arch/arm/kernel/patch.c index a50dc00d79a2..d0a05a3bdb96 100644 --- a/arch/arm/kernel/patch.c +++ b/arch/arm/kernel/patch.c @@ -16,7 +16,7 @@ struct patch { unsigned int insn; }; -static DEFINE_SPINLOCK(patch_lock); +static DEFINE_RAW_SPINLOCK(patch_lock); static void __kprobes *patch_map(void *addr, int fixmap, unsigned long *flags) __acquires(&patch_lock) @@ -33,7 +33,7 @@ static void __kprobes *patch_map(void *addr, int fixmap, unsigned long *flags) return addr; if (flags) - spin_lock_irqsave(&patch_lock, *flags); + raw_spin_lock_irqsave(&patch_lock, *flags); else __acquire(&patch_lock); @@ -48,7 +48,7 @@ static void __kprobes patch_unmap(int fixmap, unsigned long *flags) clear_fixmap(fixmap); if (flags) - spin_unlock_irqrestore(&patch_lock, *flags); + raw_spin_unlock_irqrestore(&patch_lock, *flags); else __release(&patch_lock); } -- 2.19.1