[Patch] ARCH_HAS_DEV_MEM patch for Xwindow on IA64 machine

[Jun Kamada <kama@jp.fujitsu.com>]

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Hi all,

Attached patch modifies common code in files below, so I will post it
to xen-devel and xen-ia64-devel.

- drivers/xen/Kconfig
- drivers/xen/Makefile
- drivers/xen/char/mem.c

This patch makes architecture specific memory operations to be available
only if ARCH_HAS_DEV_MEM is defined.

Background why I posted the patch is as follows.

We would like to support Xwindow on IA64 by remapping machine address to
pseudo physical address at PCI device initialization (pci_acpi_scan_root()
in arch/ia64/pci/pci.c) but at "mmap /dev/mem" systemcall.
With the new scheme, we need no longer the archtecture specific memory
operations described above.

Please see 
http://lists.xensource.com/archives/html/xen-ia64-devel/2007-06/msg00167.html

Thanks

-----
Jun Kamada
Virtual Systems Development Div.
Platform Technology Development Unit
Fujitsu Ltd.
kama@jp.fujitsu.com

[-- Attachment #2: ifdef_arch_has_dev_mem.patch --]
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# HG changeset patch
# User Jun Kamada <kama@jp.fujitsu.com>
# Date 1182406401 -32400
# Node ID 40489068407c9c5488100a2c8d54d5c64676aba0
# Parent  6d89642c02d490c24fe7ad39dce4f2622f1ef1cb
Add "#ifdef ARCH_HAS_DEV_MEM" to archtecture specific file_operations.

Signed-off-by: Jun Kamada <kama@jp.fujitsu.com>

diff -r 6d89642c02d4 -r 40489068407c drivers/xen/Kconfig
--- a/drivers/xen/Kconfig	Thu Jun 21 15:12:20 2007 +0900
+++ b/drivers/xen/Kconfig	Thu Jun 21 15:13:21 2007 +0900
@@ -273,4 +273,8 @@ config XEN_SMPBOOT
 	default y
 	depends on SMP
 
+config XEN_DEVMEM
+	bool
+	default y
+
 endif
diff -r 6d89642c02d4 -r 40489068407c drivers/xen/Makefile
--- a/drivers/xen/Makefile	Thu Jun 21 15:12:20 2007 +0900
+++ b/drivers/xen/Makefile	Thu Jun 21 15:13:21 2007 +0900
@@ -5,9 +5,9 @@ obj-y	+= xenbus/
 obj-y	+= xenbus/
 obj-y	+= gntdev/
 obj-y	+= balloon/
-obj-y	+= char/
 
 obj-y	+= util.o
+obj-$(CONFIG_XEN_DEVMEM)		+= char/
 obj-$(CONFIG_XEN_BLKDEV_BACKEND)	+= blkback/
 obj-$(CONFIG_XEN_BLKDEV_TAP)		+= blktap/
 obj-$(CONFIG_XEN_NETDEV_BACKEND)	+= netback/
diff -r 6d89642c02d4 -r 40489068407c drivers/xen/char/mem.c
--- a/drivers/xen/char/mem.c	Thu Jun 21 15:12:20 2007 +0900
+++ b/drivers/xen/char/mem.c	Thu Jun 21 15:13:21 2007 +0900
@@ -33,6 +33,7 @@ static inline int valid_phys_addr_range(
 }
 #endif
 
+#ifdef ARCH_HAS_DEV_MEM
 /*
  * This funcion reads the *physical* memory. The f_pos points directly to the 
  * memory location. 
@@ -135,6 +136,7 @@ static ssize_t write_mem(struct file * f
 	*ppos += written;
 	return written;
 }
+#endif
 
 #ifndef ARCH_HAS_DEV_MEM_MMAP_MEM
 static inline int uncached_access(struct file *file)
@@ -194,6 +196,7 @@ static int open_mem(struct inode * inode
 	return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
 }
 
+#ifdef ARCH_HAS_DEV_MEM
 const struct file_operations mem_fops = {
 	.llseek		= memory_lseek,
 	.read		= read_mem,
@@ -201,3 +204,4 @@ const struct file_operations mem_fops = 
 	.mmap		= xen_mmap_mem,
 	.open		= open_mem,
 };
+#endif

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