diff options
author | James Bottomley <James.Bottomley@SteelEye.com> | 2006-03-26 04:36:57 -0500 |
---|---|---|
committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-26 11:56:53 -0500 |
commit | 03beb07664d768db97bf454ae5c9581cd4737bb4 (patch) | |
tree | b906c4db3a70627a58363193f3f843e7e2132ca1 /include/linux/highmem.h | |
parent | 64a07bd82ed526d813b64b0957543eef55bdf9c0 (diff) |
[PATCH] Add API for flushing Anon pages
Currently, get_user_pages() returns fully coherent pages to the kernel for
anything other than anonymous pages. This is a problem for things like
fuse and the SCSI generic ioctl SG_IO which can potentially wish to do DMA
to anonymous pages passed in by users.
The fix is to add a new memory management API: flush_anon_page() which
is used in get_user_pages() to make anonymous pages coherent.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/highmem.h')
-rw-r--r-- | include/linux/highmem.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/highmem.h b/include/linux/highmem.h index 6bece9280eb..7bd2593dbef 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h | |||
@@ -7,6 +7,12 @@ | |||
7 | 7 | ||
8 | #include <asm/cacheflush.h> | 8 | #include <asm/cacheflush.h> |
9 | 9 | ||
10 | #ifndef ARCH_HAS_FLUSH_ANON_PAGE | ||
11 | static inline void flush_anon_page(struct page *page, unsigned long vmaddr) | ||
12 | { | ||
13 | } | ||
14 | #endif | ||
15 | |||
10 | #ifdef CONFIG_HIGHMEM | 16 | #ifdef CONFIG_HIGHMEM |
11 | 17 | ||
12 | #include <asm/highmem.h> | 18 | #include <asm/highmem.h> |