Frederic Weisbecker
3e1f60b80c
tracing/ftrace: check if debugfs is registered before creating files ...
Impact: fix a crash with ftrace={nop,boot} parameter
If the nop or initcall tracers are launched as boot tracers,
they will attempt to create their option directory and files.
But these tracers are registered very early and then assigned
as "boot tracers" very early if asked to.
Since they do this before debugfs has been registered (core initcall),
a crash is triggered.
Another early tracers could also come later. So we fix it by
checking if debugfs is initialized before creating the root
tracing directory.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <1237759847-21025-3-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-23 16:25:47 +01:00
tracing: protect reader of cmdline output
2009-03-16 23:27:06 -04:00
ftrace: event profile hooks
2009-03-20 10:17:07 +01:00
tracing/ftrace: fix the check on nopped sites
2009-03-16 22:15:36 -04:00
tracing/syscalls: select kallsysms
2009-03-16 09:13:17 +01:00
tracing: Introduce trace_buffer_{lock_reserve,unlock_commit}
2009-02-06 01:01:41 +01:00
ftrace: event profile hooks
2009-03-20 10:17:07 +01:00
tracing/ring-buffer: don't annotate rb_cpu_notify with __cpuinit
2009-03-21 10:54:10 +01:00
tracing/ftrace: check if debugfs is registered before creating files
2009-03-23 16:25:47 +01:00
ftrace: event profile hooks
2009-03-20 10:17:07 +01:00
tracing: Introduce trace_buffer_{lock_reserve,unlock_commit}
2009-02-06 01:01:41 +01:00
tracing: remove funky whitespace in the trace code
2009-03-10 14:13:14 -04:00
tracing: fix four sparse warnings
2009-03-22 18:16:54 +01:00
ftrace: event profile hooks
2009-03-20 10:17:07 +01:00
tracing: remove recording function depth from trace_printk
2009-03-19 15:58:47 -04:00
ftrace: event profile hooks
2009-03-20 10:17:07 +01:00
tracing: update comments to match event code macros
2009-03-10 13:12:58 -04:00
tracing: show event name in trace for TRACE_EVENT created events
2009-03-12 22:00:19 -04:00
ftrace: event profile hooks
2009-03-20 10:17:07 +01:00
tracing: remove funky whitespace in the trace code
2009-03-10 14:13:14 -04:00
tracing/core: use appropriate waiting on trace_pipe
2009-02-18 01:40:20 +01:00
function-graph: show binary events as comments
2009-03-19 15:58:56 -04:00
tracing/hw-branch-tracing: convert bts-tracer mutex to a spinlock
2009-02-25 09:16:01 +01:00
tracing: have latency tracers set the latency format
2009-03-04 22:15:30 -05:00
tracing: remove recording function depth from trace_printk
2009-03-19 15:58:47 -04:00
trace: Call tracing_reset_online_cpus before tracer->init()
2009-02-06 01:01:41 +01:00
ftrace: ensure every event gets an id
2009-03-20 10:17:06 +01:00
tracing: make print_(b)printk_msg_only global
2009-03-19 15:57:55 -04:00
tracing: make power tracer start/stop methods lighter weight
2009-03-17 23:12:11 -04:00
tracing: remove recording function depth from trace_printk
2009-03-19 15:58:47 -04:00
tracing: make sched_switch stop/start light weight
2009-03-17 23:10:45 -04:00
tracing: have latency tracers set the latency format
2009-03-04 22:15:30 -05:00
tracing: keep the tracing buffer after self-test failure
2009-03-22 15:17:21 +01:00
tracing: left align location header in stack_trace
2009-03-13 00:00:58 -04:00
tracing: fix typing mistake in hint message and comments
2009-02-17 12:38:24 -05:00
tracing/ftrace: separate events tracing and stats tracing engine
2009-01-14 12:11:37 +01:00
tracing/syscalls: protect thread flag toggling from races
2009-03-16 09:13:16 +01:00
tracing: make all file_operations const
2009-03-05 21:46:40 -05:00
tracing: Don't use tracing_record_cmdline() in workqueue tracer fix
2009-03-12 21:23:47 -04:00
3e1f60b80c