mm: FOLL flags for GUP flags

__get_user_pages() has been taking its own GUP flags, then processing
them into FOLL flags for follow_page().  Though oddly named, the FOLL
flags are more widely used, so pass them to __get_user_pages() now.
Sorry, VM flags, VM_FAULT flags and FAULT_FLAGs are still distinct.

(The patch to __get_user_pages() looks peculiar, with both gup_flags
and foll_flags: the gup_flags remain constant; but as before there's
an exceptional case, out of scope of the patch, in which foll_flags
per page have FOLL_WRITE masked off.)

Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: Rik van Riel <riel@redhat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 8 deletions

diff --git a/mm/nommu.c b/mm/nommu.c
index 386443e9d2c6..2d02ca17ce18 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -168,20 +168,20 @@ unsigned int kobjsize(const void *objp)
 }
 
 int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
-                     unsigned long start, int nr_pages, int flags,
+                     unsigned long start, int nr_pages, int foll_flags,
                      struct page **pages, struct vm_area_struct **vmas)
 {
         struct vm_area_struct *vma;
         unsigned long vm_flags;
         int i;
-        int write = !!(flags & GUP_FLAGS_WRITE);
-        int force = !!(flags & GUP_FLAGS_FORCE);
 
         /* calculate required read or write permissions.
-         * - if 'force' is set, we only require the "MAY" flags.
+         * If FOLL_FORCE is set, we only require the "MAY" flags.
          */
-        vm_flags  = write ? (VM_WRITE | VM_MAYWRITE) : (VM_READ | VM_MAYREAD);
-        vm_flags &= force ? (VM_MAYREAD | VM_MAYWRITE) : (VM_READ | VM_WRITE);
+        vm_flags  = (foll_flags & FOLL_WRITE) ?
+                        (VM_WRITE | VM_MAYWRITE) : (VM_READ | VM_MAYREAD);
+        vm_flags &= (foll_flags & FOLL_FORCE) ?
+                        (VM_MAYREAD | VM_MAYWRITE) : (VM_READ | VM_WRITE);
 
         for (i = 0; i < nr_pages; i++) {
                 vma = find_vma(mm, start);
@@ -223,9 +223,9 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
         int flags = 0;
 
         if (write)
-                flags |= GUP_FLAGS_WRITE;
+                flags |= FOLL_WRITE;
         if (force)
-                flags |= GUP_FLAGS_FORCE;
+                flags |= FOLL_FORCE;
 
         return __get_user_pages(tsk, mm, start, nr_pages, flags, pages, vmas);
 }