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ftrace: Fix ftrace hash record update with notrace
When disabling the "notrace" records, that means we want to trace them. If the notrace_hash is zero, it means that we want to trace all records. But to disable a zero notrace_hash means nothing. The check for the notrace_hash count was incorrect with: if (hash && !hash->count) return With the correct comment above it that states that we do nothing if the notrace_hash has zero count. But !hash also means that the notrace hash has zero count. I think this was done to protect against dereferencing NULL. But if !hash is true, then we go through the following loop without doing a single thing. Fix it to: if (!hash || !hash->count) return; Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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@ -1381,7 +1381,7 @@ static void __ftrace_hash_rec_update(struct ftrace_ops *ops,
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* If the notrace hash has no items,
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* then there's nothing to do.
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*/
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if (hash && !hash->count)
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if (!hash || !hash->count)
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return;
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}
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