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 3.15-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-3.15 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
@@ -466,6 +466,9 @@ 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;
@@ -475,7 +478,7 @@ 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;
@@ -492,6 +495,7 @@ 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;
}
@@ -509,6 +513,9 @@ 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;
@@ -516,7 +523,7 @@ 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;
@@ -525,6 +532,7 @@ 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-3.15/tracing-add-trace_iter_printk-flag-check-in-__trace_puts-__trace_bputs.patch
queue-3.15/tracing-add-ftrace_trace_stack-into-__trace_puts-__trace_bputs.patch
queue-3.15/tracing-instance_rmdir-leaks-ftrace_event_file-filter.patch
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