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authorPekka Paalanen <pq@iki.fi>2008-09-16 21:58:24 +0300
committerIngo Molnar <mingo@elte.hu>2008-10-14 10:37:07 +0200
commit801fe40001dfc263848552fb28924b766ed44ea4 (patch)
treefbb0a6ff09deb9f605d955ccdc6f5cb89793e1cf /kernel/trace
parent45dcd8b8a8ca855591e3ac882d3a7fc255d09d43 (diff)
ftrace: add trace_vprintk()
trace_vprintk() for easier implementation of tracer specific *_printk functions. Add check check for no_tracer, and implement __ftrace_printk() as a wrapper. Signed-off-by: Pekka Paalanen <pq@iki.fi> Acked-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/trace.c24
-rw-r--r--kernel/trace/trace.h1
2 files changed, 19 insertions, 6 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index d372bc53596..406de9cf282 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3054,7 +3054,7 @@ static __init void tracer_init_debugfs(void)
(sizeof(struct trace_field) - offsetof(struct trace_field, print.buf))
#define TRACE_CONT_BUF_SIZE sizeof(struct trace_field)
-int __ftrace_printk(unsigned long ip, const char *fmt, ...)
+int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
{
static DEFINE_SPINLOCK(trace_buf_lock);
static char trace_buf[TRACE_BUF_SIZE];
@@ -3064,10 +3064,9 @@ int __ftrace_printk(unsigned long ip, const char *fmt, ...)
struct trace_entry *entry;
unsigned long flags;
long disabled;
- va_list ap;
int cpu, len = 0, write, written = 0;
- if (!(trace_flags & TRACE_ITER_PRINTK) || !tr->ctrl || tracing_disabled)
+ if (current_trace == &no_tracer || !tr->ctrl || tracing_disabled)
return 0;
local_irq_save(flags);
@@ -3079,9 +3078,7 @@ int __ftrace_printk(unsigned long ip, const char *fmt, ...)
goto out;
spin_lock(&trace_buf_lock);
- va_start(ap, fmt);
- len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, ap);
- va_end(ap);
+ len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args);
len = min(len, TRACE_BUF_SIZE-1);
trace_buf[len] = 0;
@@ -3120,6 +3117,21 @@ int __ftrace_printk(unsigned long ip, const char *fmt, ...)
return len;
}
+EXPORT_SYMBOL_GPL(trace_vprintk);
+
+int __ftrace_printk(unsigned long ip, const char *fmt, ...)
+{
+ int ret;
+ va_list ap;
+
+ if (!(trace_flags & TRACE_ITER_PRINTK))
+ return 0;
+
+ va_start(ap, fmt);
+ ret = trace_vprintk(ip, fmt, ap);
+ va_end(ap);
+ return ret;
+}
EXPORT_SYMBOL_GPL(__ftrace_printk);
static int trace_panic_handler(struct notifier_block *this,
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 9d39aa00a9c..be3b3cf95f4 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -333,6 +333,7 @@ extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
size_t cnt);
extern long ns2usecs(cycle_t nsec);
+extern int trace_vprintk(unsigned long ip, const char *fmt, va_list args);
extern unsigned long trace_flags;