From: <gregkh@linuxfoundation.org>
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: <stable@vger.kernel.org>, <stable-commits@vger.kernel.org>
Subject: Patch "kernel/extable.c: mark core_kernel_text notrace" has been added to the 3.18-stable tree
Date: Tue, 18 Jul 2017 18:15:14 +0200 [thread overview]
Message-ID: <150039451454211@kroah.com> (raw)
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 3.18-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-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From c0d80ddab89916273cb97114889d3f337bc370ae Mon Sep 17 00:00:00 2001
From: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Date: Thu, 6 Jul 2017 15:35:31 -0700
Subject: kernel/extable.c: mark core_kernel_text notrace
From: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
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 <marcin.nowakowski@imgtec.com>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Meyer <thomas@m3y3r.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
kernel/extable.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -66,7 +66,7 @@ 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-3.18/kernel-extable.c-mark-core_kernel_text-notrace.patch
reply other threads:[~2017-07-18 16:15 UTC|newest]
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