mm: don't rely on flags coincidence

Indeed FOLL_WRITE matches FAULT_FLAG_WRITE, matches GUP_FLAGS_WRITE,
and it's tempting to devise a set of Grand Unified Paging flags;
but not today.  So until then, let's rely upon the compiler to spot
the coincidence, "rather than have that subtle dependency and a
comment for it" - as you remarked in another context yesterday.

Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Acked-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/memory.c b/mm/memory.c
index 98bcb90..50da951 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1311,8 +1311,10 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
                        while (!(page = follow_page(vma, start, foll_flags))) {
                                int ret;
 
-                               /* FOLL_WRITE matches FAULT_FLAG_WRITE! */
-                               ret = handle_mm_fault(mm, vma, start, foll_flags & FOLL_WRITE);
+                               ret = handle_mm_fault(mm, vma, start,
+                                       (foll_flags & FOLL_WRITE) ?
+                                       FAULT_FLAG_WRITE : 0);
+
                                if (ret & VM_FAULT_ERROR) {
                                        if (ret & VM_FAULT_OOM)
                                                return i ? i : -ENOMEM;