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| author |   Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2014-12-12 20:05:10 -0500 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2014-12-15 10:16:50 -0500 |
| commit | 5f893b2639b21ffe6834b1aebba392c37d2b83f9 (patch) | |
| tree | aff7db6baf3dd393a4791f2106ebacbe02b1ae5b /kernel/trace/trace_syscalls.c | |
| parent | tracing/sched: Check preempt_count() for current when reading task->state (diff) | |
| download | linux-dev-5f893b2639b21ffe6834b1aebba392c37d2b83f9.tar.xz linux-dev-5f893b2639b21ffe6834b1aebba392c37d2b83f9.zip | |
tracing: Move enabling tracepoints to just after rcu_init()
Enabling tracepoints at boot up can be very useful. The tracepoint
can be initialized right after RCU has been. There's no need to
wait for the early_initcall() to be called. That's too late for some
things that can use tracepoints for debugging. Move the logic to
enable tracepoints out of the initcalls and into init/main.c to
right after rcu_init().
This also allows trace_printk() to be used early too.
Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1412121539300.16494@nanos
Link: http://lkml.kernel.org/r/20141214164104.307127356@goodmis.org
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to '')
| -rw-r--r-- | kernel/trace/trace_syscalls.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c index a72f3d8d813e..ec239771c175 100644 --- a/kernel/trace/trace_syscalls.c +++ b/kernel/trace/trace_syscalls.c @@ -514,7 +514,7 @@ unsigned long __init __weak arch_syscall_addr(int nr) return (unsigned long)sys_call_table[nr]; } -static int __init init_ftrace_syscalls(void) +void __init init_ftrace_syscalls(void) { struct syscall_metadata *meta; unsigned long addr; @@ -524,7 +524,7 @@ static int __init init_ftrace_syscalls(void) GFP_KERNEL); if (!syscalls_metadata) { WARN_ON(1); - return -ENOMEM; + return; } for (i = 0; i < NR_syscalls; i++) { @@ -536,10 +536,7 @@ static int __init init_ftrace_syscalls(void) meta->syscall_nr = i; syscalls_metadata[i] = meta; } - - return 0; } -early_initcall(init_ftrace_syscalls); #ifdef CONFIG_PERF_EVENTS |