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authorJames Bottomley <James.Bottomley@SteelEye.com>2006-03-26 04:36:57 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-26 11:56:53 -0500
commit03beb07664d768db97bf454ae5c9581cd4737bb4 (patch)
treeb906c4db3a70627a58363193f3f843e7e2132ca1 /mm
parent64a07bd82ed526d813b64b0957543eef55bdf9c0 (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 'mm')
-rw-r--r--mm/memory.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c
index e347e106ca3a..67686048f094 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1071,6 +1071,8 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
1071 } 1071 }
1072 if (pages) { 1072 if (pages) {
1073 pages[i] = page; 1073 pages[i] = page;
1074
1075 flush_anon_page(page, start);
1074 flush_dcache_page(page); 1076 flush_dcache_page(page);
1075 } 1077 }
1076 if (vmas) 1078 if (vmas)