Some already present users may utilize resource_union() helper.
Provide it for them and for wider use in the future.
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
---
v2: reused min/max (Rafael)
include/linux/ioport.h | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 50fed618d3fb..a7d50b9a3406 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -10,9 +10,10 @@
#define _LINUX_IOPORT_H
#ifndef __ASSEMBLY__
+#include <linux/bits.h>
#include <linux/compiler.h>
+#include <linux/minmax.h>
#include <linux/types.h>
-#include <linux/bits.h>
/*
* Resources are tree-like, allowing
* nesting etc..
@@ -232,6 +233,16 @@ 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 = min(r1->start, r2->start);
+ r->end = max(r1->end, r2->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
