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

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Date:	Sat,  4 Feb 2012 22:57:46 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Tony Luck <tony.luck@...el.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Dominik Brodowski <linux@...inikbrodowski.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...e.de>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 02/24] PCI: add busn inline helper

convert back and forth with busn and domain_nr/bus_nr

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Cc: Andrew Morton <akpm@...ux-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

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