mlock: revert mainline handling of mlock error return

This change is intended to make mlock() error returns correct.
make_page_present() is a lower level function used by more than mlock().
Subsequent patch[es] will add this error return fixup in an mlock specific
path.

Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/memory.c b/mm/memory.c
index 450127f..b8487f8 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2819,19 +2819,9 @@ int make_pages_present(unsigned long addr, unsigned long end)
        len = DIV_ROUND_UP(end, PAGE_SIZE) - addr/PAGE_SIZE;
        ret = get_user_pages(current, current->mm, addr,
                        len, write, 0, NULL, NULL);
-       if (ret < 0) {
-               /*
-                  SUS require strange return value to mlock
-                   - invalid addr generate to ENOMEM.
-                   - out of memory should generate EAGAIN.
-               */
-               if (ret == -EFAULT)
-                       ret = -ENOMEM;
-               else if (ret == -ENOMEM)
-                       ret = -EAGAIN;
+       if (ret < 0)
                return ret;
-       }
-       return ret == len ? 0 : -ENOMEM;
+       return ret == len ? 0 : -1;
 }
 
 #if !defined(__HAVE_ARCH_GATE_AREA)