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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 E562CC3276C for ; Thu, 2 Jan 2020 22:37:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B081820866 for ; Thu, 2 Jan 2020 22:37:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578004659; bh=5BdZNPlIuoHYht69VTOQ8owNdfGgzIMJwxpwq/gplxk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=GUKxXcHGObnlvDXw1b54C8DpUbbBTimjebIvWmZPtVpiI67485sZ8nZ6/nDmUjpg6 TCsyq1IXXh5Sl0GCgJsnFQVDGtG/lr3L0IsB3G+U3JJoDt0fYKnww8Ytp0LsKWwtHQ pu+Ln86G3yq7PGSUJb6ipJBe4utM9SUEaLJ11vws= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731110AbgABWhi (ORCPT ); Thu, 2 Jan 2020 17:37:38 -0500 Received: from mail.kernel.org ([198.145.29.99]:50174 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731103AbgABWhd (ORCPT ); Thu, 2 Jan 2020 17:37:33 -0500 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 5BCBB20866; Thu, 2 Jan 2020 22:37:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578004652; bh=5BdZNPlIuoHYht69VTOQ8owNdfGgzIMJwxpwq/gplxk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eSblfb6vgX9Q7/E3KFp4zNwIPMvq2zU4twY6PADWFnwMRWhLh+QwoOKfsD/qTX5B/ HDFHg1278nA1YpEfWcwPAUSZLkxJU6KgtSO3/Z69Q2oLG+rQtxxpK1eFmyJwKGd7vo 7ZkYz/5aGkyzYGiUO3GPENNuXYyUYXZrJB4YKxr8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Michael Ellerman , Sasha Levin Subject: [PATCH 4.4 097/137] powerpc/pseries: Mark accumulate_stolen_time() as notrace Date: Thu, 2 Jan 2020 23:07:50 +0100 Message-Id: <20200102220600.092568994@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200102220546.618583146@linuxfoundation.org> References: <20200102220546.618583146@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 From: Michael Ellerman [ Upstream commit eb8e20f89093b64f48975c74ccb114e6775cee22 ] accumulate_stolen_time() is called prior to interrupt state being reconciled, which can trip the warning in arch_local_irq_restore(): WARNING: CPU: 5 PID: 1017 at arch/powerpc/kernel/irq.c:258 .arch_local_irq_restore+0x9c/0x130 ... NIP .arch_local_irq_restore+0x9c/0x130 LR .rb_start_commit+0x38/0x80 Call Trace: .ring_buffer_lock_reserve+0xe4/0x620 .trace_function+0x44/0x210 .function_trace_call+0x148/0x170 .ftrace_ops_no_ops+0x180/0x1d0 ftrace_call+0x4/0x8 .accumulate_stolen_time+0x1c/0xb0 decrementer_common+0x124/0x160 For now just mark it as notrace. We may change the ordering to call it after interrupt state has been reconciled, but that is a larger change. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20191024055932.27940-1-mpe@ellerman.id.au Signed-off-by: Sasha Levin --- arch/powerpc/kernel/time.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index 2e9cae5f8d17..397076474a71 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -245,7 +245,7 @@ static u64 scan_dispatch_log(u64 stop_tb) * Accumulate stolen time by scanning the dispatch trace log. * Called on entry from user mode. */ -void accumulate_stolen_time(void) +void notrace accumulate_stolen_time(void) { u64 sst, ust; -- 2.20.1