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| author | Jared Hulbert <jaredeh@gmail.com> | 2008-04-28 02:13:02 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-28 08:58:23 -0700 |
| commit | 30afcb4bd2762fa4b87b17ada9500aa46dc10b1b (patch) | |
| tree | 0920f491a37683a8784c146270b98f82a7e0aa2c /drivers/block | |
| parent | 423bad600443c590f34ed7ce357591f76f48f137 (diff) | |
| download | linux-30afcb4bd2762fa4b87b17ada9500aa46dc10b1b.tar.gz linux-30afcb4bd2762fa4b87b17ada9500aa46dc10b1b.tar.bz2 linux-30afcb4bd2762fa4b87b17ada9500aa46dc10b1b.zip | |
return pfn from direct_access, for XIP
Alter the block device ->direct_access() API to work with the new
get_xip_mem() API (that requires both kaddr and pfn are returned).
Some architectures will not do the right thing in their virt_to_page() for use
by XIP (to translate from the kernel virtual address returned by
direct_access(), to a user mappable pfn in XIP's page fault handler.
However, we can't switch it to just return the pfn and not the kaddr, because
we have no good way to get a kva from a pfn, and XIP requires the kva for its
read(2) and write(2) handlers. So we have to return both.
Signed-off-by: Jared Hulbert <jaredeh@gmail.com>
Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Carsten Otte <cotte@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: linux-mm@kvack.org
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/brd.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/block/brd.c b/drivers/block/brd.c index 7bd76639544c..e8e38faeafd8 100644 --- a/drivers/block/brd.c +++ b/drivers/block/brd.c @@ -319,7 +319,7 @@ out: #ifdef CONFIG_BLK_DEV_XIP static int brd_direct_access (struct block_device *bdev, sector_t sector, - unsigned long *data) + void **kaddr, unsigned long *pfn) { struct brd_device *brd = bdev->bd_disk->private_data; struct page *page; @@ -333,7 +333,8 @@ static int brd_direct_access (struct block_device *bdev, sector_t sector, page = brd_insert_page(brd, sector); if (!page) return -ENOMEM; - *data = (unsigned long)page_address(page); + *kaddr = page_address(page); + *pfn = page_to_pfn(page); return 0; } |