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| author | Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2013-03-09 00:56:08 -0500 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2013-03-15 00:35:57 -0400 |
| commit | 1b22e382ab40b0e3ee5abb3e310dffb16fee22aa (patch) | |
| tree | 2e6ca7c130fb6420ba955072275218c7ec287511 | |
| parent | ca268da6e415448a43138e1abc5d5f057af319d7 (diff) | |
| download | linux-1b22e382ab40b0e3ee5abb3e310dffb16fee22aa.tar.bz2 | |
tracing: Let tracing_snapshot() be used by modules but not NMI
Add EXPORT_SYMBOL_GPL() to let the tracing_snapshot() functions be
called from modules.
Also add a test to see if the snapshot was called from NMI context
and just warn in the tracing buffer if so, and return.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| -rw-r--r-- | kernel/trace/trace.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index d372c6504c99..5c53e4092269 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -442,6 +442,12 @@ void tracing_snapshot(void) struct tracer *tracer = tr->current_trace; unsigned long flags; + if (in_nmi()) { + internal_trace_puts("*** SNAPSHOT CALLED FROM NMI CONTEXT ***\n"); + internal_trace_puts("*** snapshot is being ignored ***\n"); + return; + } + if (!tr->allocated_snapshot) { internal_trace_puts("*** SNAPSHOT NOT ALLOCATED ***\n"); internal_trace_puts("*** stopping trace here! ***\n"); @@ -460,6 +466,7 @@ void tracing_snapshot(void) update_max_tr(tr, current, smp_processor_id()); local_irq_restore(flags); } +EXPORT_SYMBOL_GPL(tracing_snapshot); static int resize_buffer_duplicate_size(struct trace_buffer *trace_buf, struct trace_buffer *size_buf, int cpu_id); @@ -493,16 +500,19 @@ void tracing_snapshot_alloc(void) tracing_snapshot(); } +EXPORT_SYMBOL_GPL(tracing_snapshot_alloc); #else void tracing_snapshot(void) { WARN_ONCE(1, "Snapshot feature not enabled, but internal snapshot used"); } +EXPORT_SYMBOL_GPL(tracing_snapshot); void tracing_snapshot_alloc(void) { /* Give warning */ tracing_snapshot(); } +EXPORT_SYMBOL_GPL(tracing_snapshot_alloc); #endif /* CONFIG_TRACER_SNAPSHOT */ /** |