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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>
This commit is contained in:
Hugh Dickins 2009-06-23 13:52:49 +01:00 committed by Linus Torvalds
parent 788c7df451
commit d26ed650d9
1 changed files with 4 additions and 2 deletions
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6
mm/memory.c
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@ -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;