diff mbox series

[v1,4/7] resource: Introduce resource_intersection() for overlapping resources

Message ID 20200813175729.15088-4-andriy.shevchenko@linux.intel.com
State New
Headers show
Series [v1,1/7] resource: Simplify region_intersects() by reducing conditionals | expand

Commit Message

Andy Shevchenko Aug. 13, 2020, 5:57 p.m. UTC 
There will be at least one user that can utilize new helper.
Provide the helper for future user and for wider use.

Deliberately avoid min()/max() macro as they are still parts of
kernel.h which is quite a burden to be included here in order
to avoid circular dependencies.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 include/linux/ioport.h | 10 ++++++++++
 1 file changed, 10 insertions(+)
diff mbox series

Patch

diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index c98df0ec7422..1d5ab2e7f9eb 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -232,6 +232,16 @@  static inline bool resource_overlaps(struct resource *r1, struct resource *r2)
        return (r1->start <= r2->end && r1->end >= r2->start);
 }
 
+static inline bool
+resource_intersection(struct resource *r1, struct resource *r2, struct resource *r)
+{
+	if (!resource_overlaps(r1, r2))
+		return false;
+	r->start = r1->start > r2->start ? r1->start : r2->start;
+	r->end = r1->end < r2->end ? r1->end : r2->end;
+	return true;
+}
+
 static inline bool
 resource_union(struct resource *r1, struct resource *r2, struct resource *r)
 {