[PATCH 1/9] introduce virt_to_pagoff()

["YOSHIFUJI Hideaki / 吉藤英明" <yoshfuji@linux-ipv6.org>]

In article <20030810020444.48cb740b.davem@redhat.com> (at Sun, 10 Aug 2003 02:04:44 -0700), "David S. Miller" <davem@redhat.com> says:

> Yoshfuji, feel free to do your conversions, and use this
> linux/mm.h placement of the virt_to_pageoff() macro instead
> of having to put it into every asm header.

[1/9] introduce virt_to_pageoff().

Index: linux-2.6/Documentation/DMA-mapping.txt
===================================================================
RCS file: /home/cvs/linux-2.5/Documentation/DMA-mapping.txt,v
retrieving revision 1.17
diff -u -r1.17 DMA-mapping.txt
--- linux-2.6/Documentation/DMA-mapping.txt	1 Aug 2003 19:02:34 -0000	1.17
+++ linux-2.6/Documentation/DMA-mapping.txt	10 Aug 2003 08:40:50 -0000
@@ -689,7 +689,7 @@
 and offset using something like this:
 
 	struct page *page = virt_to_page(ptr);
-	unsigned long offset = ((unsigned long)ptr & ~PAGE_MASK);
+	unsigned long offset = virt_to_pageoff(ptr);
 
 Here are the interfaces:
 
Index: linux-2.6/include/linux/mm.h
===================================================================
RCS file: /home/cvs/linux-2.5/include/linux/mm.h,v
retrieving revision 1.125
diff -u -r1.125 mm.h
--- linux-2.6/include/linux/mm.h	1 Aug 2003 17:02:32 -0000	1.125
+++ linux-2.6/include/linux/mm.h	10 Aug 2003 08:40:55 -0000
@@ -400,6 +400,8 @@
 #define VM_FAULT_MINOR	1
 #define VM_FAULT_MAJOR	2
 
+#define virt_to_pageoff(p)	((unsigned long)(p) & ~PAGE_MASK)
+
 extern void show_free_areas(void);
 
 struct page *shmem_nopage(struct vm_area_struct * vma,


-- 
Hideaki YOSHIFUJI @ USAGI Project <yoshfuji@linux-ipv6.org>
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