From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:58572 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751413AbdGRPQN (ORCPT ); Tue, 18 Jul 2017 11:16:13 -0400 Subject: Patch "kernel/extable.c: mark core_kernel_text notrace" has been added to the 4.12-stable tree To: marcin.nowakowski@imgtec.com, akpm@linux-foundation.org, daniel@iogearbox.net, gregkh@linuxfoundation.org, mhiramat@kernel.org, mingo@kernel.org, paul.gortmaker@windriver.com, peterz@infradead.org, rostedt@goodmis.org, tglx@linutronix.de, thomas@m3y3r.de, torvalds@linux-foundation.org Cc: , From: Date: Tue, 18 Jul 2017 17:16:03 +0200 Message-ID: <150039096332202@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled kernel/extable.c: mark core_kernel_text notrace to the 4.12-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: kernel-extable.c-mark-core_kernel_text-notrace.patch and it can be found in the queue-4.12 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From c0d80ddab89916273cb97114889d3f337bc370ae Mon Sep 17 00:00:00 2001 From: Marcin Nowakowski Date: Thu, 6 Jul 2017 15:35:31 -0700 Subject: kernel/extable.c: mark core_kernel_text notrace From: Marcin Nowakowski commit c0d80ddab89916273cb97114889d3f337bc370ae upstream. 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: Call Trace: ftrace_return_to_handler+0x50/0x128 core_kernel_text+0x10/0x1b8 prepare_ftrace_return+0x6c/0x114 ftrace_graph_caller+0x20/0x44 return_to_handler+0x10/0x30 return_to_handler+0x0/0x30 return_to_handler+0x0/0x30 ftrace_ops_no_ops+0x114/0x1bc core_kernel_text+0x10/0x1b8 core_kernel_text+0x10/0x1b8 core_kernel_text+0x10/0x1b8 ftrace_ops_no_ops+0x114/0x1bc core_kernel_text+0x10/0x1b8 prepare_ftrace_return+0x6c/0x114 ftrace_graph_caller+0x20/0x44 (...) Mark the function notrace to avoid it being traced. Link: http://lkml.kernel.org/r/1498028607-6765-1-git-send-email-marcin.nowakowski@imgtec.com Signed-off-by: Marcin Nowakowski Reviewed-by: Masami Hiramatsu Cc: Peter Zijlstra Cc: Thomas Meyer Cc: Ingo Molnar Cc: Steven Rostedt Cc: Daniel Borkmann Cc: Paul Gortmaker Cc: Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- kernel/extable.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/kernel/extable.c +++ b/kernel/extable.c @@ -69,7 +69,7 @@ static inline int init_kernel_text(unsig 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) Patches currently in stable-queue which might be from marcin.nowakowski@imgtec.com are queue-4.12/kernel-extable.c-mark-core_kernel_text-notrace.patch