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tracing: Have trace events system open call tracing_open_generic_tr()

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Instead of having the trace events system open call open code the taking of
the trace_array descriptor (with trace_array_get()) and then calling
trace_open_generic(), have it use the tracing_open_generic_tr() that does
the combination of the two. This requires making tracing_open_generic_tr()
global.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2019-10-11 19:12:21 -04:00
parent 194c2c74f5
commit aa07d71f1b
3 changed files with 5 additions and 15 deletions
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2
kernel/trace/trace.c
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@ -4156,7 +4156,7 @@ bool tracing_is_disabled(void)
* Open and update trace_array ref count.
* Must have the current trace_array passed to it.
*/
static int tracing_open_generic_tr(struct inode *inode, struct file *filp)
int tracing_open_generic_tr(struct inode *inode, struct file *filp)
{
struct trace_array *tr = inode->i_private;

1
kernel/trace/trace.h
View File

@ -681,6 +681,7 @@ void tracing_reset_online_cpus(struct trace_buffer *buf);
void tracing_reset_current(int cpu);
void tracing_reset_all_online_cpus(void);
int tracing_open_generic(struct inode *inode, struct file *filp);
int tracing_open_generic_tr(struct inode *inode, struct file *filp);
bool tracing_is_disabled(void);
bool tracer_tracing_is_on(struct trace_array *tr);
void tracer_tracing_on(struct trace_array *tr);

17
kernel/trace/trace_events.c
View File

@ -1440,28 +1440,17 @@ static int system_tr_open(struct inode *inode, struct file *filp)
struct trace_array *tr = inode->i_private;
int ret;
if (tracing_is_disabled())
return -ENODEV;
if (trace_array_get(tr) < 0)
return -ENODEV;
/* Make a temporary dir that has no system but points to tr */
dir = kzalloc(sizeof(*dir), GFP_KERNEL);
if (!dir) {
trace_array_put(tr);
if (!dir)
return -ENOMEM;
}
dir->tr = tr;
ret = tracing_open_generic(inode, filp);
ret = tracing_open_generic_tr(inode, filp);
if (ret < 0) {
trace_array_put(tr);
kfree(dir);
return ret;
}
dir->tr = tr;
filp->private_data = dir;
return 0;