Commit 44ac8413 authored by Bjorn Helgaas's avatar Bjorn Helgaas Committed by Linus Torvalds
Browse files

[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: default avatarBjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent a1365647

drivers/char/mem.c

+14 −9
Original line number Diff line number Diff line
@@ -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,