From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751106AbdFUHDf (ORCPT ); Wed, 21 Jun 2017 03:03:35 -0400 Received: from mailapp01.imgtec.com ([195.59.15.196]:52884 "EHLO mailapp01.imgtec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750876AbdFUHDd (ORCPT ); Wed, 21 Jun 2017 03:03:33 -0400 From: Marcin Nowakowski To: Andrew Morton , "Peter Zijlstra (Intel)" , Thomas Meyer , Ingo Molnar , "Steven Rostedt (VMware)" , Daniel Borkmann , Paul Gortmaker , Masami Hiramatsu , Thomas Gleixner , CC: , Marcin Nowakowski Subject: [PATCH] kernel/extable.c: mark core_kernel_text notrace Date: Wed, 21 Jun 2017 09:03:26 +0200 Message-ID: <1498028607-6765-1-git-send-email-marcin.nowakowski@imgtec.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.80.2.5] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org core_kernel_text is used by MIPS in its function graph trace processing, so having this method traced leads to an infinite set of recursive calls such as: [ 2.972075] Call Trace: [ 2.972111] [ 2.976731] [<80506584>] ftrace_return_to_handler+0x50/0x128 [ 2.983379] [<8045478c>] core_kernel_text+0x10/0x1b8 [ 2.989146] [<804119b8>] prepare_ftrace_return+0x6c/0x114 [ 2.995402] [<80411b2c>] ftrace_graph_caller+0x20/0x44 [ 3.001362] [<80411b60>] return_to_handler+0x10/0x30 [ 3.007159] [<80411b50>] return_to_handler+0x0/0x30 [ 3.012827] [<80411b50>] return_to_handler+0x0/0x30 [ 3.018621] [<804e589c>] ftrace_ops_no_ops+0x114/0x1bc [ 3.024602] [<8045478c>] core_kernel_text+0x10/0x1b8 [ 3.030377] [<8045478c>] core_kernel_text+0x10/0x1b8 [ 3.036140] [<8045478c>] core_kernel_text+0x10/0x1b8 [ 3.041915] [<804e589c>] ftrace_ops_no_ops+0x114/0x1bc [ 3.047923] [<8045478c>] core_kernel_text+0x10/0x1b8 [ 3.053682] [<804119b8>] prepare_ftrace_return+0x6c/0x114 [ 3.059938] [<80411b2c>] ftrace_graph_caller+0x20/0x44 (...) Mark the function notrace to avoid it being traced. Signed-off-by: Marcin Nowakowski --- kernel/extable.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/extable.c b/kernel/extable.c index 2676d7f..4efaf26 100644 --- a/kernel/extable.c +++ b/kernel/extable.c @@ -70,7 +70,7 @@ static inline int init_kernel_text(unsigned long addr) return 0; } -int core_kernel_text(unsigned long addr) +int notrace core_kernel_text(unsigned long addr) { if (addr >= (unsigned long)_stext && addr < (unsigned long)_etext) -- 2.7.4