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Message-Id: <20140726190214.993897423@linuxfoundation.org>
Date: Sat, 26 Jul 2014 12:01:48 -0700
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCH 3.14 14/87] tracing: Add ftrace_trace_stack into __trace_puts/__trace_bputs
3.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: "zhangwei(Jovi)" <jovi.zhangwei@...wei.com>
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@huawei.com
Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@...wei.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
kernel/trace/trace.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -454,6 +454,9 @@ 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;
@@ -463,7 +466,7 @@ 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;
@@ -480,6 +483,7 @@ 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;
}
@@ -497,6 +501,9 @@ 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;
@@ -504,7 +511,7 @@ 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;
@@ -513,6 +520,7 @@ 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;
}
--
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