]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
[PATCH] ppc: make phys_mem_access_prot() work with pfns instead of addresses
authorRoland Dreier <rolandd@cisco.com>
Sat, 29 Oct 2005 00:46:18 +0000 (17:46 -0700)
committerPaul Mackerras <paulus@samba.org>
Sat, 29 Oct 2005 04:25:49 +0000 (14:25 +1000)
commit8b150478aeb1a8edb9015c2f7ac4da637ff65c45
tree621b038b9c041fe82b708c6c5cbee655be2a519a
parentd49b340124a34fcb8bceda472558ccef7232c16f
[PATCH] ppc: make phys_mem_access_prot() work with pfns instead of addresses

Change the phys_mem_access_prot() function to take a pfn instead of an
address.  This allows mmap64() to work on /dev/mem for addresses above 4G
on 32-bit architectures.  We start with a pfn in mmap_mem(), so there's no
need to convert to an address; in fact, it's actively bad, since the
conversion can overflow when the address is above 4G.

Similarly fix the ppc32 page_is_ram() function to avoid a conversion to an
address by directly comparing to max_pfn.  Working with max_pfn instead of
high_memory fixes page_is_ram() to give the right answer for highmem pages.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
Cc: Anton Blanchard <anton@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
12 files changed:
arch/powerpc/mm/mem.c
arch/ppc/kernel/pci.c
arch/ppc/mm/init.c
arch/ppc64/kernel/pci.c
drivers/char/mem.c
drivers/video/fbmem.c
include/asm-powerpc/machdep.h
include/asm-ppc/machdep.h
include/asm-ppc/pci.h
include/asm-ppc/pgtable.h
include/asm-ppc64/pci.h
include/asm-ppc64/pgtable.h