From 8b150478aeb1a8edb9015c2f7ac4da637ff65c45 Mon Sep 17 00:00:00 2001 From: Roland Dreier <rolandd@cisco.com> Date: Fri, 28 Oct 2005 17:46:18 -0700 Subject: [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> --- drivers/video/fbmem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/video') diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c index 70be7009f8af..ca02aa2bfcec 100644 --- a/drivers/video/fbmem.c +++ b/drivers/video/fbmem.c @@ -918,7 +918,7 @@ fb_mmap(struct file *file, struct vm_area_struct * vma) } #endif #elif defined(__powerpc__) - vma->vm_page_prot = phys_mem_access_prot(file, off, + vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT, vma->vm_end - vma->vm_start, vma->vm_page_prot); #elif defined(__alpha__) -- cgit v1.2.3