rangeset: introduce rangeset_merge

This new helper will merge two rangesets.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>

diff --git a/xen/common/rangeset.c b/xen/common/rangeset.c
index e3857ab816157fcd2937dd4f90e4010fbc73d1cc..f34cafdc7e91ef31beb9277796c19169cd9afbac 100644 (file)
--- a/xen/common/rangeset.c
+++ b/xen/common/rangeset.c
@@ -384,6 +384,18 @@ int rangeset_consume_ranges(struct rangeset *r,
     return rc;
 }
 
+static int merge(unsigned long s, unsigned long e, void *data)
+{
+    struct rangeset *r = data;
+
+    return rangeset_add_range(r, s, e);
+}
+
+int rangeset_merge(struct rangeset *r1, struct rangeset *r2)
+{
+    return rangeset_report_ranges(r2, 0, ~0ul, merge, r1);
+}
+
 int rangeset_add_singleton(
     struct rangeset *r, unsigned long s)
 {

diff --git a/xen/include/xen/rangeset.h b/xen/include/xen/rangeset.h
index 583b72bb0ca5abf85979ce913cec42732e3cb9c8..0c05c2fd4e43f980b05d3355a0db54b9b82c14e7 100644 (file)
--- a/xen/include/xen/rangeset.h
+++ b/xen/include/xen/rangeset.h
@@ -80,6 +80,9 @@ int rangeset_consume_ranges(struct rangeset *r,
                                       void *, unsigned long *c),
                             void *ctxt);
 
+/* Merge rangeset r2 into rangeset r1. */
+int __must_check rangeset_merge(struct rangeset *r1, struct rangeset *r2);
+
 /* Add/remove/query a single number. */
 int __must_check rangeset_add_singleton(
     struct rangeset *r, unsigned long s);