mm: uncached vma support with writenotify

Modify the generic mmap() code to keep the cache attribute in
vma->vm_page_prot regardless if writenotify is enabled or not.  Without
this patch the cache configuration selected by f_op->mmap() is overwritten
if writenotify is enabled, making it impossible to keep the vma uncached.

Needed by drivers such as drivers/video/sh_mobile_lcdcfb.c which uses
deferred io together with uncached memory.

Signed-off-by: Magnus Damm <damm@opensource.se>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Jaya Kumar <jayakumar.lkml@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/mmap.c b/mm/mmap.c
index 02c09f33df8bd6b16bade4e123f84d0aa206f2db..d9c77b2dbe9d6489cdf5e40e5f5ae0dfc2be2a5a 100644 (file)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1198,8 +1198,20 @@ munmap_back:
                        goto free_vma;
        }
 
-       if (vma_wants_writenotify(vma))
+       if (vma_wants_writenotify(vma)) {
+               pgprot_t pprot = vma->vm_page_prot;
+
+               /* Can vma->vm_page_prot have changed??
+                *
+                * Answer: Yes, drivers may have changed it in their
+                *         f_op->mmap method.
+                *
+                * Ensures that vmas marked as uncached stay that way.
+                */
                vma->vm_page_prot = vm_get_page_prot(vm_flags & ~VM_SHARED);
+               if (pgprot_val(pprot) == pgprot_val(pgprot_noncached(pprot)))
+                       vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+       }
 
        vma_link(mm, vma, prev, rb_link, rb_parent);
        file = vma->vm_file;