Steven Rostedt (Red Hat)
d840f718d2
tracing: Init current_trace to nop_trace and remove NULL checks
...
On early boot up, when the ftrace ring buffer is initialized, the
static variable current_trace is initialized to &nop_trace.
Before this initialization, current_trace is NULL and will never
become NULL again. It is always reassigned to a ftrace tracer.
Several places check if current_trace is NULL before it uses
it, and this check is frivolous, because at the point in time
when the checks are made the only way current_trace could be
NULL is if ftrace failed its allocations at boot up, and the
paths to these locations would probably not be possible.
By initializing current_trace to &nop_trace where it is declared,
current_trace will never be NULL, and we can remove all these
checks of current_trace being NULL which never needed to be
checked in the first place.
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Hiraku Toyooka <hiraku.toyooka.gu@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2013-02-01 18:38:47 -05:00
..
blktrace.c
tracing: Use this_cpu_ptr per-cpu helper
2013-01-21 13:22:30 -05:00
ftrace.c
tracing: Avoid unnecessary multiple recursion checks
2013-01-22 23:38:01 -05:00
Kconfig
tracing: Make a snapshot feature available from userspace
2013-01-30 11:02:06 -05:00
Makefile
trace: Stop compiling in trace_clock unconditionally
2012-09-13 22:52:08 -04:00
power-traces.c
ring_buffer.c
ring-buffer: Add stats field for amount read from trace ring buffer
2013-01-30 11:01:53 -05:00
ring_buffer_benchmark.c
rpm-traces.c
trace.c
tracing: Init current_trace to nop_trace and remove NULL checks
2013-02-01 18:38:47 -05:00
trace.h
tracing: Make a snapshot feature available from userspace
2013-01-30 11:02:06 -05:00
trace_branch.c
tracing: Cache comms only after an event occurred
2012-10-31 16:45:31 -04:00
trace_clock.c
tracing: Use sched_clock_cpu for trace_clock_global
2013-01-30 11:02:05 -05:00
trace_entries.h
trace_event_perf.c
perf/core improvements and fixes:
2012-08-21 11:27:00 +02:00
trace_events.c
tracing: Remove the extra 4 bytes of padding in events
2013-01-21 21:05:41 -05:00
trace_events_filter.c
tracing: Replace strict_strto* with kstrto*
2012-10-31 16:45:23 -04:00
trace_events_filter_test.h
trace_export.c
tracing: Do not enable function event with enable
2012-05-10 15:55:43 -04:00
trace_functions.c
tracing: Fix unsigned int compare of zero in recursion check
2013-01-24 07:52:34 -05:00
trace_functions_graph.c
tracing/fgraph: Adjust fgraph depth before calling trace return callback
2013-01-29 17:30:31 -05:00
trace_irqsoff.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2012-12-13 12:00:02 -08:00
trace_kdb.c
trace_kprobe.c
tracing: Use irq_work for wake ups and remove *_nowake_*() functions
2012-11-02 10:21:52 -04:00
trace_mmiotrace.c
trace_nop.c
trace_output.c
tracing: Format non-nanosec times from tsc clock without a decimal point.
2012-11-13 15:48:40 -05:00
trace_output.h
trace_printk.c
tracing: Add percpu buffers for trace_printk()
2012-04-23 21:15:55 -04:00
trace_probe.c
tracing: Replace strict_strto* with kstrto*
2012-10-31 16:45:23 -04:00
trace_probe.h
tracing: Provide trace events interface for uprobes
2012-05-07 14:30:17 +02:00
trace_sched_switch.c
tracing: Use irq_work for wake ups and remove *_nowake_*() functions
2012-11-02 10:21:52 -04:00
trace_sched_wakeup.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2012-12-13 12:00:02 -08:00
trace_selftest.c
ftrace: Fix function tracing recursion self test
2013-01-22 23:37:58 -05:00
trace_selftest_dynamic.c
trace_stack.c
tracing: Remove unneeded checks from the stack tracer
2012-11-19 15:07:13 -05:00
trace_stat.c
trace_stat.h
trace_syscalls.c
tracing/syscalls: Make local functions static
2013-01-21 13:22:31 -05:00
trace_uprobe.c
tracing: Verify target file before registering a uprobe event
2013-01-21 13:22:31 -05:00