From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751913Ab0JTE7L (ORCPT ); Wed, 20 Oct 2010 00:59:11 -0400 Received: from hera.kernel.org ([140.211.167.34]:34092 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750946Ab0JTE7J (ORCPT ); Wed, 20 Oct 2010 00:59:09 -0400 Date: Wed, 20 Oct 2010 04:58:50 GMT From: tip-bot for Jiri Olsa Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@redhat.com, rostedt@goodmis.org, tglx@linutronix.de, jolsa@redhat.com Reply-To: mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org, rostedt@goodmis.org, tglx@linutronix.de, jolsa@redhat.com In-Reply-To: <20100924154102.GB1818@jolsa.brq.redhat.com> References: <20100924154102.GB1818@jolsa.brq.redhat.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/core] tracing: Add proper check for irq_depth routines Message-ID: Git-Commit-ID: a9d61173dc1cb63e660ae89e874e51ba4fd2f991 X-Mailer: tip-git-log-daemon MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.3 (hera.kernel.org [127.0.0.1]); Wed, 20 Oct 2010 04:58:51 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: a9d61173dc1cb63e660ae89e874e51ba4fd2f991 Gitweb: http://git.kernel.org/tip/a9d61173dc1cb63e660ae89e874e51ba4fd2f991 Author: Jiri Olsa AuthorDate: Fri, 24 Sep 2010 17:41:02 +0200 Committer: Steven Rostedt CommitDate: Mon, 18 Oct 2010 10:53:25 -0400 tracing: Add proper check for irq_depth routines The check_irq_entry and check_irq_return could be called from graph event context. In such case there's no graph private data allocated. Adding checks to handle this case. Signed-off-by: Jiri Olsa LKML-Reference: <20100924154102.GB1818@jolsa.brq.redhat.com> [ Fixed some grammar in the comments ] Signed-off-by: Steven Rostedt --- kernel/trace/trace_functions_graph.c | 24 ++++++++++++++++++++---- 1 files changed, 20 insertions(+), 4 deletions(-) diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c index ef49e93..4c58ccc 100644 --- a/kernel/trace/trace_functions_graph.c +++ b/kernel/trace/trace_functions_graph.c @@ -888,12 +888,20 @@ check_irq_entry(struct trace_iterator *iter, u32 flags, unsigned long addr, int depth) { int cpu = iter->cpu; + int *depth_irq; struct fgraph_data *data = iter->private; - int *depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq); - if (flags & TRACE_GRAPH_PRINT_IRQS) + /* + * If we are either displaying irqs, or we got called as + * a graph event and private data does not exist, + * then we bypass the irq check. + */ + if ((flags & TRACE_GRAPH_PRINT_IRQS) || + (!data)) return 0; + depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq); + /* * We are inside the irq code */ @@ -926,12 +934,20 @@ static int check_irq_return(struct trace_iterator *iter, u32 flags, int depth) { int cpu = iter->cpu; + int *depth_irq; struct fgraph_data *data = iter->private; - int *depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq); - if (flags & TRACE_GRAPH_PRINT_IRQS) + /* + * If we are either displaying irqs, or we got called as + * a graph event and private data does not exist, + * then we bypass the irq check. + */ + if ((flags & TRACE_GRAPH_PRINT_IRQS) || + (!data)) return 0; + depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq); + /* * We are not inside the irq code. */