提交 44ac8413 编写于 作者: B Bjorn Helgaas 提交者: Linus Torvalds

[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: NBjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
上级 a1365647
......@@ -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,
......
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