From: Bjorn Helgaas <bjorn.helgaas@hp.com>
Date: Sun, 8 Jan 2006 09:04:10 +0000 (-0800)
Subject: [PATCH] /dev/mem __HAVE_PHYS_MEM_ACCESS_PROT tidy-up
X-Git-Tag: v2.6.16-rc1~727
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=44ac8413901167589226abf824d994aa57e4fd28;p=linux-2.6

[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>
---

diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index a85f3a3614..ce3ff86411 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,