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KOSAKI Motohiro 10dd3ebe21 tracing: fix deadlock when setting set_ftrace_pid ... Impact: fix deadlock while using set_ftrace_pid Reproducer: # cd /sys/kernel/debug/tracing # echo $$ > set_ftrace_pid then, console becomes hung. Details: when writing set_ftracepid, kernel callstack is following ftrace_pid_write() mutex_lock(&ftrace_lock); ftrace_update_pid_func() mutex_lock(&ftrace_lock); mutex_unlock(&ftrace_lock); mutex_unlock(&ftrace_lock); then, system always deadlocks when ftrace_pid_write() is called. In past days, ftrace_pid_write() used ftrace_start_lock, but commit e6ea44e9b4 consolidated ftrace_start_lock to ftrace_lock. Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Steven Rostedt <srostedt@redhat.com> LKML-Reference: <20090306151155.0778.A69D9226@jp.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>		16 years ago
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Kconfig	tracing: current tip/master can't enable ftrace	16 years ago
Makefile	tracing: add format files for ftrace default entries	16 years ago
blktrace.c	tracing: remove extra latency_trace method from trace structure	16 years ago
events.c	…
ftrace.c	tracing: fix deadlock when setting set_ftrace_pid	16 years ago
kmemtrace.c	…
ring_buffer.c	tracing: make all file_operations const	16 years ago
trace.c	tracing: make all file_operations const	16 years ago
trace.h	tracing: rename ftrace_printk() => trace_printk()	16 years ago
trace_boot.c	…
trace_branch.c	tracing: remove extra latency_trace method from trace structure	16 years ago
trace_clock.c	…
trace_event_types.h	tracing: add format files for ftrace default entries	16 years ago
trace_events.c	tracing: add format files for ftrace default entries	16 years ago
trace_events_stage_1.h	…
trace_events_stage_2.h	tracing: move print of event format to separate file	16 years ago
trace_events_stage_3.h	…
trace_export.c	tracing: add format files for ftrace default entries	16 years ago
trace_format.h	tracing: add format files for ftrace default entries	16 years ago
trace_functions.c	…
trace_functions_graph.c	tracing/function-graph-tracer: use the more lightweight local clock	16 years ago
trace_hw_branches.c	…
trace_irqsoff.c	tracing: have latency tracers set the latency format	16 years ago
trace_mmiotrace.c	…
trace_nop.c	…
trace_output.c	tracing: remove extra latency_trace method from trace structure	16 years ago
trace_output.h	tracing: remove extra latency_trace method from trace structure	16 years ago
trace_power.c	…
trace_sched_switch.c	…
trace_sched_wakeup.c	tracing: have latency tracers set the latency format	16 years ago
trace_selftest.c	…
trace_selftest_dynamic.c	…
trace_stack.c	…
trace_stat.c	…
trace_stat.h	…
trace_sysprof.c	tracing: make all file_operations const	16 years ago
trace_workqueue.c	…