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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 DBD39C43603 for ; Wed, 11 Dec 2019 15:38:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A954A21556 for ; Wed, 11 Dec 2019 15:38:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576078698; bh=sSeF2pOcrcOoEKD/5DY8hdbuJunIM9Yesp2liHcaKRI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=pyK2etobSGM6QVrIZGVImP2iOL9h0p1vVXPKzUG38g5BjG9UNaUpxghjtsNQgOdAQ ojxjgCLkq8vOO6dSFyzsnv3ecrlE4cBE5W0b7FZRrubnAPD3TZHV5/XQq+322XJTbL ROinNjBqKcypIKNJ4Fm2G9NmTKiazEq0dinn0POk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388357AbfLKPiR (ORCPT ); Wed, 11 Dec 2019 10:38:17 -0500 Received: from mail.kernel.org ([198.145.29.99]:44182 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388101AbfLKPfU (ORCPT ); Wed, 11 Dec 2019 10:35:20 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C21D324679; Wed, 11 Dec 2019 15:35:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576078519; bh=sSeF2pOcrcOoEKD/5DY8hdbuJunIM9Yesp2liHcaKRI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=au4WMGwjFGt9pH2XXTIMyyvKnoSZw+VyUkhChBkSDtEpaxYGTOd9eyGvOOwVuBuLS tNIEw7D3itivzfq6pJLmWMfEyAPhlukLkSwO8odr+3ZupcQov8rLgF497Vfx4e3+d3 VCSZCOreQa7ky3QfNHpWBQNyFmz9aucFodHb+zBQ= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Michael Ellerman , Sasha Levin , linuxppc-dev@lists.ozlabs.org Subject: [PATCH AUTOSEL 4.9 08/42] powerpc/pseries: Mark accumulate_stolen_time() as notrace Date: Wed, 11 Dec 2019 10:34:36 -0500 Message-Id: <20191211153510.23861-8-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191211153510.23861-1-sashal@kernel.org> References: <20191211153510.23861-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore 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 ab7b661b6da3a..412ac5d45160b 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -257,7 +257,7 @@ 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; u8 save_soft_enabled = local_paca->soft_enabled; -- 2.20.1