X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fchar%2Fmem.c;h=850a78c9c4bc9c639dd5b2c5816a4c89e7568eb1;hb=e0be4d32bdae5cebc4e6d9dc65886e279aa69d08;hp=42187381506b7d0ff45dcdcc4df5dc2be7a2867f;hpb=aef7b83c92dd0b7e994805440655d1d64147287b;p=linux-2.6

diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 4218738150..850a78c9c4 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -261,7 +261,11 @@ static int mmap_mem(struct file * file, struct vm_area_struct * vma)
 
 static int mmap_kmem(struct file * file, struct vm_area_struct * vma)
 {
-        unsigned long long val;
+	unsigned long pfn;
+
+	/* Turn a kernel-virtual address into a physical page frame */
+	pfn = __pa((u64)vma->vm_pgoff << PAGE_SHIFT) >> PAGE_SHIFT;
+
 	/*
 	 * RED-PEN: on some architectures there is more mapped memory
 	 * than available in mem_map which pfn_valid checks
@@ -269,10 +273,10 @@ static int mmap_kmem(struct file * file, struct vm_area_struct * vma)
 	 *
 	 * RED-PEN: vmalloc is not supported right now.
 	 */
-	if (!pfn_valid(vma->vm_pgoff))
+	if (!pfn_valid(pfn))
 		return -EIO;
-	val = (u64)vma->vm_pgoff << PAGE_SHIFT;
-	vma->vm_pgoff = __pa(val) >> PAGE_SHIFT;
+
+	vma->vm_pgoff = pfn;
 	return mmap_mem(file, vma);
 }