提交 c13d2f7c 编写于 作者: C Carsten Emde 提交者: Steven Rostedt

tracing: Fix trace_marker output

When a string was written to <debugfs>/tracing/trace_marker, some
strange characters appeared in the trace output instead of the
string, since a vprint function erroneously called a vararg print
function with a va_list argument. This patch fixes the problem and
simplifies the related code.
Signed-off-by: NCarsten Emde <C.Emde@osadl.org>
LKML-Reference: <4B01AE5D.1010801@osadl.org>
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
上级 811cb50b
......@@ -1361,10 +1361,11 @@ int trace_array_vprintk(struct trace_array *tr,
pause_graph_tracing();
raw_local_irq_save(irq_flags);
__raw_spin_lock(&trace_buf_lock);
len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args);
len = min(len, TRACE_BUF_SIZE-1);
trace_buf[len] = 0;
if (args == NULL) {
strncpy(trace_buf, fmt, TRACE_BUF_SIZE);
len = strlen(trace_buf);
} else
len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args);
size = sizeof(*entry) + len + 1;
buffer = tr->buffer;
......@@ -1373,10 +1374,10 @@ int trace_array_vprintk(struct trace_array *tr,
if (!event)
goto out_unlock;
entry = ring_buffer_event_data(event);
entry->ip = ip;
entry->ip = ip;
memcpy(&entry->buf, trace_buf, len);
entry->buf[len] = 0;
entry->buf[len] = '\0';
if (!filter_check_discard(call, entry, buffer, event))
ring_buffer_unlock_commit(buffer, event);
......@@ -3319,22 +3320,11 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
return cnt;
}
static int mark_printk(const char *fmt, ...)
{
int ret;
va_list args;
va_start(args, fmt);
ret = trace_vprintk(0, fmt, args);
va_end(args);
return ret;
}
static ssize_t
tracing_mark_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *fpos)
{
char *buf;
char *end;
if (tracing_disabled)
return -EINVAL;
......@@ -3342,7 +3332,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
if (cnt > TRACE_BUF_SIZE)
cnt = TRACE_BUF_SIZE;
buf = kmalloc(cnt + 1, GFP_KERNEL);
buf = kmalloc(cnt + 2, GFP_KERNEL);
if (buf == NULL)
return -ENOMEM;
......@@ -3350,14 +3340,13 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
kfree(buf);
return -EFAULT;
}
if (buf[cnt-1] != '\n') {
buf[cnt] = '\n';
buf[cnt+1] = '\0';
} else
buf[cnt] = '\0';
/* Cut from the first nil or newline. */
buf[cnt] = '\0';
end = strchr(buf, '\n');
if (end)
*end = '\0';
cnt = mark_printk("%s\n", buf);
cnt = trace_vprintk(0, buf, NULL);
kfree(buf);
*fpos += cnt;
......
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