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tracing: Pass export pointer as argument to ->write() 

By passing an export descriptor to the write function, users don't need to
keep a global static pointer and can rely on container_of() to fetch their
own structure.

Link: http://lkml.kernel.org/r/20170602102025.5140-1-felipe.balbi@linux.intel.com

Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Reviewed-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Felipe Balbi 2017-06-02 13:20:25 +03:00 committed by Steven Rostedt (VMware)
parent c4bfd39d7f
commit a773d41927
3 changed files with 6 additions and 4 deletions
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6
drivers/hwtracing/stm/ftrace.c
View File

@ -42,9 +42,11 @@ static struct stm_ftrace {
* @len: length of the data packet * @len: length of the data packet
*/ */
static void notrace static void notrace
stm_ftrace_write(const void *buf, unsigned int len) stm_ftrace_write(struct trace_export *export, const void *buf, unsigned int len)
{ {
stm_source_write(&stm_ftrace.data, STM_FTRACE_CHAN, buf, len); struct stm_ftrace *stm = container_of(export, struct stm_ftrace, ftrace);
stm_source_write(&stm->data, STM_FTRACE_CHAN, buf, len);
} }
static int stm_ftrace_link(struct stm_source_data *data) static int stm_ftrace_link(struct stm_source_data *data)

2
include/linux/trace.h
View File

@ -18,7 +18,7 @@
*/ */
struct trace_export { struct trace_export {
struct trace_export __rcu *next; struct trace_export __rcu *next;
void (*write)(const void *, unsigned int); void (*write)(struct trace_export *, const void *, unsigned int);
}; };
int register_ftrace_export(struct trace_export *export); int register_ftrace_export(struct trace_export *export);

2
kernel/trace/trace.c
View File

@ -2415,7 +2415,7 @@ trace_process_export(struct trace_export *export,
entry = ring_buffer_event_data(event); entry = ring_buffer_event_data(event);
size = ring_buffer_event_length(event); size = ring_buffer_event_length(event);
export->write(entry, size); export->write(export, entry, size);
} }
static DEFINE_MUTEX(ftrace_export_lock); static DEFINE_MUTEX(ftrace_export_lock);