Patch "tracing: Add ftrace_trace_stack into __trace_puts/__trace_bputs" has been added to the 3.10-stable tree

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This is a note to let you know that I've just added the patch titled

    tracing: Add ftrace_trace_stack into __trace_puts/__trace_bputs

to the 3.10-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:
     tracing-add-ftrace_trace_stack-into-__trace_puts-__trace_bputs.patch
and it can be found in the queue-3.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 8abfb8727f4a724d31f9ccfd8013fbd16d539445 Mon Sep 17 00:00:00 2001
From: "zhangwei(Jovi)" <jovi.zhangwei@xxxxxxxxxx>
Date: Thu, 18 Jul 2013 16:31:05 +0800
Subject: tracing: Add ftrace_trace_stack into __trace_puts/__trace_bputs

From: "zhangwei(Jovi)" <jovi.zhangwei@xxxxxxxxxx>

commit 8abfb8727f4a724d31f9ccfd8013fbd16d539445 upstream.

Currently trace option stacktrace is not applicable for
trace_printk with constant string argument, the reason is
in __trace_puts/__trace_bputs ftrace_trace_stack is missing.

In contrast, when using trace_printk with non constant string
argument(will call into __trace_printk/__trace_bprintk), then
trace option stacktrace is workable, this inconstant result
will confuses users a lot.

Link: http://lkml.kernel.org/p/51E7A7C9.9040401@xxxxxxxxxx

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@xxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 kernel/trace/trace.c |   12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -423,6 +423,9 @@ int __trace_puts(unsigned long ip, const
 	struct print_entry *entry;
 	unsigned long irq_flags;
 	int alloc;
+	int pc;
+
+	pc = preempt_count();
 
 	if (unlikely(tracing_selftest_running || tracing_disabled))
 		return 0;
@@ -432,7 +435,7 @@ int __trace_puts(unsigned long ip, const
 	local_save_flags(irq_flags);
 	buffer = global_trace.trace_buffer.buffer;
 	event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, alloc, 
-					  irq_flags, preempt_count());
+					  irq_flags, pc);
 	if (!event)
 		return 0;
 
@@ -449,6 +452,7 @@ int __trace_puts(unsigned long ip, const
 		entry->buf[size] = '\0';
 
 	__buffer_unlock_commit(buffer, event);
+	ftrace_trace_stack(buffer, irq_flags, 4, pc);
 
 	return size;
 }
@@ -466,6 +470,9 @@ int __trace_bputs(unsigned long ip, cons
 	struct bputs_entry *entry;
 	unsigned long irq_flags;
 	int size = sizeof(struct bputs_entry);
+	int pc;
+
+	pc = preempt_count();
 
 	if (unlikely(tracing_selftest_running || tracing_disabled))
 		return 0;
@@ -473,7 +480,7 @@ int __trace_bputs(unsigned long ip, cons
 	local_save_flags(irq_flags);
 	buffer = global_trace.trace_buffer.buffer;
 	event = trace_buffer_lock_reserve(buffer, TRACE_BPUTS, size,
-					  irq_flags, preempt_count());
+					  irq_flags, pc);
 	if (!event)
 		return 0;
 
@@ -482,6 +489,7 @@ int __trace_bputs(unsigned long ip, cons
 	entry->str			= str;
 
 	__buffer_unlock_commit(buffer, event);
+	ftrace_trace_stack(buffer, irq_flags, 4, pc);
 
 	return 1;
 }


Patches currently in stable-queue which might be from jovi.zhangwei@xxxxxxxxxx are

queue-3.10/tracing-add-ftrace_trace_stack-into-__trace_puts-__trace_bputs.patch
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