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Xiao Guangrong 04aef32d39 tracing/function: Fix the return value of ftrace_trace_onoff_callback() ... ftrace_trace_onoff_callback() will return an error even if we do the right operation, for example: # echo _spin_*:traceon:10 > set_ftrace_filter -bash: echo: write error: Invalid argument # cat set_ftrace_filter #### all functions enabled #### _spin_trylock_bh:traceon:count=10 _spin_unlock_irq:traceon:count=10 _spin_unlock_bh:traceon:count=10 _spin_lock_irq:traceon:count=10 _spin_unlock:traceon:count=10 _spin_trylock:traceon:count=10 _spin_unlock_irqrestore:traceon:count=10 _spin_lock_irqsave:traceon:count=10 _spin_lock_bh:traceon:count=10 _spin_lock:traceon:count=10 We want to set _spin_*:traceon:10 to set_ftrace_filter, it complains with "Invalid argument", but the operation is successful. This is because ftrace_process_regex() returns the number of functions that matched the pattern. If the number is not 0, this value is returned by ftrace_regex_write() whereas we want to return the number of bytes virtually written. Also the file offset pointer is not updated in this case. If the number of matched functions is lower than the number of bytes written by the user, this results to a reprocessing of the string given by the user with a lower size, leading to a malformed ftrace regex and then a -EINVAL returned. So, this patch fixes it by returning 0 if no error occured. The fix also applies on 2.6.30 Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Reviewed-by: Li Zefan <lizf@cn.fujitsu.com> Cc: stable@kernel.org Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>		16 years ago
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Kconfig	tracing/fastboot: Document the need of initcall_debug	16 years ago
Makefile	tracing/events: convert block trace points to TRACE_EVENT()	16 years ago
blktrace.c	headers: smp_lock.h redux	16 years ago
ftrace.c	tracing/function-profiler: do not free per cpu variable stat	16 years ago
kmemtrace.c	cpumask: use new operators in kernel/trace	16 years ago
ring_buffer.c	ring-buffer: Make it generally available	16 years ago
ring_buffer_benchmark.c	ring-buffer: have benchmark test print to trace buffer	16 years ago
trace.c	headers: smp_lock.h redux	16 years ago
trace.h	ring-buffer: Make it generally available	16 years ago
trace_boot.c	…
trace_branch.c	…
trace_clock.c	…
trace_event_profile.c	…
trace_event_types.h	trace_export: Repair missed fields	16 years ago
trace_events.c	tracing/events: Don't increment @pos in s_start()	16 years ago
trace_events_filter.c	tracing/filters: fix race between filter setting and module unload	16 years ago
trace_export.c	…
trace_functions.c	tracing/function: Fix the return value of ftrace_trace_onoff_callback()	16 years ago
trace_functions_graph.c	function-graph: add stack frame test	16 years ago
trace_hw_branches.c	…
trace_irqsoff.c	…
trace_mmiotrace.c	…
trace_nop.c	…
trace_output.c	tracing: Fix trace_print_seq()	16 years ago
trace_output.h	tracing: add protection around module events unload	16 years ago
trace_power.c	…
trace_printk.c	tracing_bprintk: Don't increment @pos in t_start()	16 years ago
trace_sched_switch.c	…
trace_sched_wakeup.c	…
trace_selftest.c	…
trace_selftest_dynamic.c	…
trace_stack.c	tracing: Fix stack tracer sysctl handling	16 years ago
trace_stat.c	trace_stat: Don't increment @pos in seq start()	16 years ago
trace_stat.h	…
trace_syscalls.c	…
trace_sysprof.c	Merge branch 'timers-for-linus-migration' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	16 years ago
trace_workqueue.c	trace_workqueue: remove blank line between each cpu	16 years ago