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 <[email protected]> Cc: Nick Piggin <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
RyanHsu · Jul 31, 2007 · 2e92a3b · 2e92a3b
1 parent 6a30235
commit 2e92a3b
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Showing 2 changed files with 8 additions and 1 deletion.
diff --git 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
@@ -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);