fix broken aliasing checks for MAP_FIXED on sparc32, mips, arm and sh

We want addr - (pgoff << PAGE_SHIFT) consistently coloured...

Acked-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c
index 2b7996401b0f..f5abc51c5a07 100644
--- a/arch/arm/mm/mmap.c
+++ b/arch/arm/mm/mmap.c
@@ -54,7 +54,8 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
          * We enforce the MAP_FIXED case.
          */
         if (flags & MAP_FIXED) {
-                if (aliasing && flags & MAP_SHARED && addr & (SHMLBA - 1))
+                if (aliasing && flags & MAP_SHARED &&
+                    (addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))
                         return -EINVAL;
                 return addr;
         }