NOMMU: Fix SYSV IPC SHM

Fix the SYSV IPC SHM to work with the changes applied by the new fault handler
patches when CONFIG_MMU=n.

Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 8 insertions, 1 deletions

diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c
index cad2b7ace630..237fe8b8e819 100644
--- a/fs/ramfs/file-nommu.c
+++ b/fs/ramfs/file-nommu.c
@@ -295,5 +295,10 @@ unsigned long ramfs_nommu_get_unmapped_area(struct file *file,
  */
 int ramfs_nommu_mmap(struct file *file, struct vm_area_struct *vma)
 {
-        return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
+        if (!(vma->vm_flags & VM_SHARED))
+                return -ENOSYS;
+
+        file_accessed(file);
+        vma->vm_ops = &generic_file_vm_ops;
+        return 0;
 }
diff --git a/ipc/shm.c b/ipc/shm.c
index d0259e3ad1c0..d88ac5a07ec7 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -268,7 +268,9 @@ static int shm_mmap(struct file * file, struct vm_area_struct * vma)
         if (ret != 0)
                 return ret;
         sfd->vm_ops = vma->vm_ops;
+#ifdef CONFIG_MMU
         BUG_ON(!sfd->vm_ops->fault);
+#endif
         vma->vm_ops = &shm_vm_ops;
         shm_open(vma);