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tracing: Apply trace filters on all output channels 

The event filters are not applied on all of the output, which results in
the flood of printk when using tp_printk. Unfolding
event_trigger_unlock_commit_regs() into trace_event_buffer_commit(), so
the filters can be applied on every output.

Link: https://lkml.kernel.org/r/20210814034538.8428-1-kernelfans@gmail.com

Cc: stable@vger.kernel.org
Fixes: 0daa230296 ("tracing: Add tp_printk cmdline to have tracepoints go to printk()")
Signed-off-by: Pingfan Liu <kernelfans@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Pingfan Liu 2021-08-14 11:45:38 +08:00 committed by Steven Rostedt (VMware)
parent 5acce0bff2
commit 6c34df6f35
2 changed files with 15 additions and 35 deletions
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18
kernel/trace/trace.c
View File

@ -2897,14 +2897,26 @@ int tracepoint_printk_sysctl(struct ctl_table *table, int write,
void trace_event_buffer_commit(struct trace_event_buffer *fbuffer)
{
enum event_trigger_type tt = ETT_NONE;
struct trace_event_file *file = fbuffer->trace_file;
if (__event_trigger_test_discard(file, fbuffer->buffer, fbuffer->event,
fbuffer->entry, &tt))
goto discard;
if (static_key_false(&tracepoint_printk_key.key))
output_printk(fbuffer);
if (static_branch_unlikely(&trace_event_exports_enabled))
ftrace_exports(fbuffer->event, TRACE_EXPORT_EVENT);
event_trigger_unlock_commit_regs(fbuffer->trace_file, fbuffer->buffer,
fbuffer->event, fbuffer->entry,
fbuffer->trace_ctx, fbuffer->regs);
trace_buffer_unlock_commit_regs(file->tr, fbuffer->buffer,
fbuffer->event, fbuffer->trace_ctx, fbuffer->regs);
discard:
if (tt)
event_triggers_post_call(file, tt);
}
EXPORT_SYMBOL_GPL(trace_event_buffer_commit);

32
kernel/trace/trace.h
View File

@ -1389,38 +1389,6 @@ event_trigger_unlock_commit(struct trace_event_file *file,
event_triggers_post_call(file, tt);
}
/**
* event_trigger_unlock_commit_regs - handle triggers and finish event commit
* @file: The file pointer associated with the event
* @buffer: The ring buffer that the event is being written to
* @event: The event meta data in the ring buffer
* @entry: The event itself
* @trace_ctx: The tracing context flags.
*
* This is a helper function to handle triggers that require data
* from the event itself. It also tests the event against filters and
* if the event is soft disabled and should be discarded.
*
* Same as event_trigger_unlock_commit() but calls
* trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit().
*/
static inline void
event_trigger_unlock_commit_regs(struct trace_event_file *file,
struct trace_buffer *buffer,
struct ring_buffer_event *event,
void *entry, unsigned int trace_ctx,
struct pt_regs *regs)
{
enum event_trigger_type tt = ETT_NONE;
if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
trace_buffer_unlock_commit_regs(file->tr, buffer, event,
trace_ctx, regs);
if (tt)
event_triggers_post_call(file, tt);
}
#define FILTER_PRED_INVALID ((unsigned short)-1)
#define FILTER_PRED_IS_RIGHT (1 << 15)
#define FILTER_PRED_FOLD (1 << 15)