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authorJared Hulbert <jaredeh@gmail.com>2008-04-28 02:13:02 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 08:58:23 -0700
commit30afcb4bd2762fa4b87b17ada9500aa46dc10b1b (patch)
tree0920f491a37683a8784c146270b98f82a7e0aa2c /arch/powerpc/sysdev
parent423bad600443c590f34ed7ce357591f76f48f137 (diff)
downloadop-kernel-dev-30afcb4bd2762fa4b87b17ada9500aa46dc10b1b.zip
op-kernel-dev-30afcb4bd2762fa4b87b17ada9500aa46dc10b1b.tar.gz
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 'arch/powerpc/sysdev')
-rw-r--r--arch/powerpc/sysdev/axonram.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/powerpc/sysdev/axonram.c b/arch/powerpc/sysdev/axonram.c
index d359d6e..7f59188 100644
--- a/arch/powerpc/sysdev/axonram.c
+++ b/arch/powerpc/sysdev/axonram.c
@@ -143,7 +143,7 @@ axon_ram_make_request(struct request_queue *queue, struct bio *bio)
*/
static int
axon_ram_direct_access(struct block_device *device, sector_t sector,
- unsigned long *data)
+ void **kaddr, unsigned long *pfn)
{
struct axon_ram_bank *bank = device->bd_disk->private_data;
loff_t offset;
@@ -154,7 +154,8 @@ axon_ram_direct_access(struct block_device *device, sector_t sector,
return -ERANGE;
}
- *data = bank->ph_addr + offset;
+ *kaddr = (void *)(bank->ph_addr + offset);
+ *pfn = virt_to_phys(kaddr) >> PAGE_SHIFT;
return 0;
}
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