mm, gup: return EINTR when gup is interrupted by fatal signals

EINTR is the usual error code which other killable interfaces return.
This is the case for the other fatal_signal_pending break out from the
same function.  Make the code consistent.

ERESTARTSYS is also quite confusing because the signal is fatal and so
no restart will happen before returning to the userspace.

Signed-off-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Hillf Danton <hdanton@sina.com>
Link: http://lkml.kernel.org/r/20200409071133.31734-1-mhocko@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/gup.c b/mm/gup.c
index 6076df8e04a4e74dbb1405aa0e28ec9c72b59c4b..50681f0286ded05c26c0dc98660e4df5cd1ebecc 100644 (file)
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1088,7 +1088,7 @@ retry:
                 * potentially allocating memory.
                 */
                if (fatal_signal_pending(current)) {
-                       ret = -ERESTARTSYS;
+                       ret = -EINTR;
                        goto out;
                }
                cond_resched();