[PATCH v4 20/20] libtraceeval: Add traceeval_remove()

[Steven Rostedt <rostedt@goodmis.org>]

From: "Steven Rostedt (Google)" <rostedt@goodmis.org>

Add a way to remove an entry that's in the traceeval. Currently there's
only ways to add entries, but there also needs to be a way to remove them
too.

Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
---
 include/traceeval-hist.h |  3 +++
 src/histograms.c         | 29 +++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/include/traceeval-hist.h b/include/traceeval-hist.h
index 4e0e9c057045..0cee9bcbeb83 100644
--- a/include/traceeval-hist.h
+++ b/include/traceeval-hist.h
@@ -160,6 +160,9 @@ int traceeval_insert(struct traceeval *teval,
 		     const union traceeval_data *keys,
 		     const union traceeval_data *vals);
 
+int traceeval_remove(struct traceeval *teval,
+		     const union traceeval_data *keys);
+
 int traceeval_query(struct traceeval *teval, const union traceeval_data *keys,
 		    const union traceeval_data **results);
 
diff --git a/src/histograms.c b/src/histograms.c
index c008694b41b7..96f0926f062c 100644
--- a/src/histograms.c
+++ b/src/histograms.c
@@ -934,6 +934,35 @@ int traceeval_insert(struct traceeval *teval,
 		return update_entry(teval, entry, vals);
 }
 
+/**
+ * traceeval_remove - remove an item from the traceeval descriptor
+ * @teval: The descriptor to removed from
+ * @keys: The list of keys that defines what is being removed
+ *
+ * This is the opposite of traceeval_insert(). Instead of inserting
+ * an item into the traceeval historgram, it removes it.
+ *
+ * Returns 1 if it found and removed an item,
+ *         0 if it did not find an time matching @keys
+ *        -1 if there was an error.
+ */
+int traceeval_remove(struct traceeval *teval,
+		     const union traceeval_data *keys)
+{
+	struct hash_table *hist = teval->hist;
+	struct entry *entry;
+	int check;
+
+	entry = NULL;
+	check = get_entry(teval, keys, &entry);
+
+	if (check < 1)
+		return check;
+
+	hash_remove(hist, &entry->hash);
+	return 1;
+}
+
 /**
  * traceeval_iterator_put - release a given iterator
  * @iter: The iterartor to release
-- 
2.40.1