[PATCH] fix bogon in /dev/mem mmap'ing on nommu

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

While digging through my MAP_FIXED changes, I found that rather obvious
bug in /dev/mem mmap implementation for nommu archs. get_unmapped_area()
is expected to return an address, not a pfn.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---

I suppose that can go in anytime, and probably in stable too, Dave ?

Index: linux-cell/drivers/char/mem.c
===================================================================
--- linux-cell.orig/drivers/char/mem.c	2007-02-12 10:36:14.000000000 +1100
+++ linux-cell/drivers/char/mem.c	2007-04-12 11:38:44.000000000 +1000
@@ -248,7 +248,7 @@ static unsigned long get_unmapped_area_m
 {
 	if (!valid_mmap_phys_addr_range(pgoff, len))
 		return (unsigned long) -EINVAL;
-	return pgoff;
+	return pgoff << PAGE_SHIFT;
 }
 
 /* can't do an in-place private mapping if there's no MMU */