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authorBjorn Helgaas <bjorn.helgaas@hp.com>2006-01-08 01:04:10 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-08 20:14:02 -0800
commit44ac8413901167589226abf824d994aa57e4fd28 (patch)
treee84b213b960a5b309e426860701e60d98fbb05a5 /drivers/char/mem.c
parenta1365647022eb05a5993f270a78e9bef3bf554eb (diff)
[PATCH] /dev/mem __HAVE_PHYS_MEM_ACCESS_PROT tidy-up
Tidy up __HAVE_PHYS_MEM_ACCESS_PROT usage to make mmap_mem() easier to read. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/char/mem.c')
-rw-r--r--drivers/char/mem.c23
1 files changed, 14 insertions, 9 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index a85f3a36144..ce3ff864119 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -228,20 +228,25 @@ static ssize_t write_mem(struct file * file, const char __user * buf,
return written;
}
+#ifndef __HAVE_PHYS_MEM_ACCESS_PROT
+static pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
+ unsigned long size, pgprot_t vma_prot)
+{
+#ifdef pgprot_noncached
+ unsigned long offset = pfn << PAGE_SHIFT;
+
+ if (uncached_access(file, offset))
+ return pgprot_noncached(vma_prot);
+#endif
+ return vma_prot;
+}
+#endif
+
static int mmap_mem(struct file * file, struct vm_area_struct * vma)
{
-#if defined(__HAVE_PHYS_MEM_ACCESS_PROT)
vma->vm_page_prot = phys_mem_access_prot(file, vma->vm_pgoff,
vma->vm_end - vma->vm_start,
vma->vm_page_prot);
-#elif defined(pgprot_noncached)
- unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
- int uncached;
-
- uncached = uncached_access(file, offset);
- if (uncached)
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-#endif
/* Remap-pfn-range will mark the range VM_IO and VM_RESERVED */
if (remap_pfn_range(vma,