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authorJerry Snitselaar <jsnitsel@redhat.com>2015-04-30 08:10:24 -0700
committerSteven Rostedt <rostedt@goodmis.org>2015-05-12 15:56:57 -0400
commit7e255d346c12888f7cce4b89a03a5fe5e9196ab1 (patch)
treeb87449fa2978ae7d1975b566e1936784a57cd36b /kernel/trace
parent755a27e7e4c817dd51ade41668b380f26026899c (diff)
downloadlinux-7e255d346c12888f7cce4b89a03a5fe5e9196ab1.tar.bz2
tracing: Export tracing clock functions
Critical tracepoint hooks should never call anything that takes a lock, so they are unable to call getrawmonotonic() or ktime_get(). Export the rest of the tracing clock functions so can be used in tracepoint hooks. Background: We have a customer that adds their own module and registers a tracepoint hook to sched_wakeup. They were using ktime_get() for a time source, but it grabs a seq lock and caused a deadlock to occur. Link: http://lkml.kernel.org/r/1430406624-22609-1-git-send-email-jsnitsel@redhat.com Signed-off-by: Jerry Snitselaar <jsnitsel@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/trace_clock.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/trace/trace_clock.c b/kernel/trace/trace_clock.c
index 57b67b1f24d1..0f06532a755b 100644
--- a/kernel/trace/trace_clock.c
+++ b/kernel/trace/trace_clock.c
@@ -56,6 +56,7 @@ u64 notrace trace_clock(void)
{
return local_clock();
}
+EXPORT_SYMBOL_GPL(trace_clock);
/*
* trace_jiffy_clock(): Simply use jiffies as a clock counter.
@@ -68,6 +69,7 @@ u64 notrace trace_clock_jiffies(void)
{
return jiffies_64_to_clock_t(jiffies_64 - INITIAL_JIFFIES);
}
+EXPORT_SYMBOL_GPL(trace_clock_jiffies);
/*
* trace_clock_global(): special globally coherent trace clock
@@ -123,6 +125,7 @@ u64 notrace trace_clock_global(void)
return now;
}
+EXPORT_SYMBOL_GPL(trace_clock_global);
static atomic64_t trace_counter;