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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2017-06-26 11:47:31 -0400
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2017-06-26 11:53:04 -0400
commit8c08f0d5c6fb10ff93ffb1cbf416f4f1c3a52a80 (patch)
treed4d025db4b5ec05a0e2d553c028ea23694f7e777 /kernel/trace/trace.h
parentd7fbf8df7ca0a5c7e85db79f7005f99cb461c525 (diff)
ftrace: Have cached module filters be an active filter
When a module filter is added to set_ftrace_filter, if the module is not loaded, it is cached. This should be considered an active filter, and function tracing should be filtered by this. That is, if a cached module filter is the only filter set, then no function tracing should be happening, as all the functions available will be filtered out. This makes sense, as the reason to add a cached module filter, is to trace the module when you load it. There shouldn't be any other tracing happening until then. Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.h')
-rw-r--r--kernel/trace/trace.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index d63550cdbdfa..13823951e42b 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -773,10 +773,15 @@ struct ftrace_mod_load {
int enable;
};
+enum {
+ FTRACE_HASH_FL_MOD = (1 << 0),
+};
+
struct ftrace_hash {
unsigned long size_bits;
struct hlist_head *buckets;
unsigned long count;
+ unsigned long flags;
struct rcu_head rcu;
};
@@ -785,7 +790,7 @@ ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
{
- return !hash || !hash->count;
+ return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD));
}
/* Standard output formatting function used for function return traces */