From 44ac8413901167589226abf824d994aa57e4fd28 Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Sun, 8 Jan 2006 01:04:10 -0800 Subject: [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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/char/mem.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-) (limited to 'drivers/char/mem.c') diff --git a/drivers/char/mem.c b/drivers/char/mem.c index a85f3a361442..ce3ff8641191 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, -- cgit v1.2.3