idr: Add new function idr_is_empty()

Signed-off-by: Andreas Gruenbacher <[email protected]> Signed-off-by: Philipp Reisner <[email protected]>
ambv · Feb 17, 2014 · 05f7a7d · 05f7a7d
1 parent 8e22943
commit 05f7a7d
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diff --git a/include/linux/idr.h b/include/linux/idr.h
@@ -85,6 +85,7 @@ void idr_remove(struct idr *idp, int id);
 void idr_free(struct idr *idp, int id);
 void idr_destroy(struct idr *idp);
 void idr_init(struct idr *idp);
+bool idr_is_empty(struct idr *idp);
 
 /**
  * idr_preload_end - end preload section started with idr_preload()

diff --git a/lib/idr.c b/lib/idr.c
@@ -869,6 +869,16 @@ void idr_init(struct idr *idp)
 }
 EXPORT_SYMBOL(idr_init);
 
+static int idr_has_entry(int id, void *p, void *data)
+{
+	return 1;
+}
+
+bool idr_is_empty(struct idr *idp)
+{
+	return !idr_for_each(idp, idr_has_entry, NULL);
+}
+EXPORT_SYMBOL(idr_is_empty);
 
 /**
  * DOC: IDA description