[PATCH v10 09/17] rangeset: add rangeset_empty() function

[Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>]

This function can be used when user wants to remove all rangeset
entries but do not want to destroy rangeset itself.

Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>

---

Changes in v10:

 - New in v10. The function is used in "vpci/header: handle p2m range sets per 
BAR"
---
 xen/common/rangeset.c      | 9 +++++++--
 xen/include/xen/rangeset.h | 3 ++-
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/xen/common/rangeset.c b/xen/common/rangeset.c
index 35c3420885..420275669e 100644
--- a/xen/common/rangeset.c
+++ b/xen/common/rangeset.c
@@ -448,8 +448,7 @@ struct rangeset *rangeset_new(
     return r;
 }
 
-void rangeset_destroy(
-    struct rangeset *r)
+void rangeset_empty(struct rangeset *r)
 {
     struct range *x;
 
@@ -465,6 +464,12 @@ void rangeset_destroy(
 
     while ( (x = first_range(r)) != NULL )
         destroy_range(r, x);
+}
+
+void rangeset_destroy(
+    struct rangeset *r)
+{
+    rangeset_empty(r);
 
     xfree(r);
 }
diff --git a/xen/include/xen/rangeset.h b/xen/include/xen/rangeset.h
index f7c69394d6..5eded7ffc5 100644
--- a/xen/include/xen/rangeset.h
+++ b/xen/include/xen/rangeset.h
@@ -56,7 +56,7 @@ void rangeset_limit(
 bool_t __must_check rangeset_is_empty(
     const struct rangeset *r);
 
-/* Add/claim/remove/query a numeric range. */
+/* Add/claim/remove/query/empty a numeric range. */
 int __must_check rangeset_add_range(
     struct rangeset *r, unsigned long s, unsigned long e);
 int __must_check rangeset_claim_range(struct rangeset *r, unsigned long size,
@@ -70,6 +70,7 @@ bool_t __must_check rangeset_overlaps_range(
 int rangeset_report_ranges(
     struct rangeset *r, unsigned long s, unsigned long e,
     int (*cb)(unsigned long s, unsigned long e, void *), void *ctxt);
+void rangeset_empty(struct rangeset *r);
 
 /*
  * Note that the consume function can return an error value apart from
-- 
2.42.0