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tracing: Add ftrace_trace_stack into __trace_puts/__trace_bputs

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commit 8abfb8727f 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@huawei.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
zhangwei(Jovi)
2013-07-18 16:31:05 +08:00
committed by Greg Kroah-Hartman
parent 9b87c4e58f
commit e250100bed
1 changed files with 10 additions and 2 deletions
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12
kernel/trace/trace.c
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@@ -423,6 +423,9 @@ int __trace_puts(unsigned long ip, const char *str, int size)
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 char *str, int size)
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 char *str, int size)
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, const char *str)
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, const char *str)
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, const char *str)
entry->str = str;
__buffer_unlock_commit(buffer, event);
ftrace_trace_stack(buffer, irq_flags, 4, pc);
return 1;
}