Some already present users may utilize resource_union() helper.
Provide it for them and for wider use in the future.
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@xxxxxxxxxxxxxxx>
Cc: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Cc: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: linux-pci@xxxxxxxxxxxxxxx
---
include/linux/ioport.h | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 0193987b9968..c98df0ec7422 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_union(struct resource *r1, struct resource *r2, struct resource *r)
+{
+ if (!resource_overlaps(r1, r2))
+ return false;
+ r->start = r2->start < r1->start ? r2->start : r1->start;
+ r->end = r2->end > r1->end ? r2->end : r1->end;
+ return true;
+}
+
/* Convenience shorthand with allocation */
#define request_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), 0)
#define request_muxed_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED)
--
2.28.0
