[PATCH 02/24] PCI: add busn inline helper

[Yinghai Lu <yinghai@kernel.org>]

convert back and forth with busn and domain_nr/bus_nr

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
---
 include/linux/ioport.h |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 6fe9e19..f80c0cc 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -138,6 +138,23 @@ extern struct resource ioport_resource;
 extern struct resource iomem_resource;
 extern struct resource iobusn_resource;
 
+static inline int busn_domain_nr(resource_size_t busn)
+{
+	return busn >> 8;
+}
+static inline int busn_bus_nr(resource_size_t busn)
+{
+	return busn & 0xff;
+}
+static inline resource_size_t busn_update_bus_nr(resource_size_t busn, int b_nr)
+{
+	return (busn & ~0xff) | (b_nr & 0xff);
+}
+static inline resource_size_t busn(int d_nr, int b_nr)
+{
+	return  ((d_nr & 0xffff) << 8) | (b_nr & 0xff);
+}
+
 extern struct resource *request_resource_conflict(struct resource *root, struct resource *new);
 extern int request_resource(struct resource *root, struct resource *new);
 extern int release_resource(struct resource *new);
-- 
1.7.7