arc/mm: use helper fault_signal_pending()

Let ARC to use the new helper fault_signal_pending() by moving the signal
check out of the retry logic as standalone.  This should also helps to
simplify the code a bit.

Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Brian Geffon <bgeffon@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Bobby Powers <bobbypowers@gmail.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Denis Plotnikov <dplotnikov@virtuozzo.com>
Cc: "Dr . David Alan Gilbert" <dgilbert@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: "Kirill A . Shutemov" <kirill@shutemov.name>
Cc: Martin Cracauer <cracauer@cons.org>
Cc: Marty McFadden <mcfadden8@llnl.gov>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Maya Gokhale <gokhale2@llnl.gov>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Link: http://lkml.kernel.org/r/20200220155843.9172-1-peterx@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/arc/mm/fault.c b/arch/arc/mm/fault.c
index fb86bc3e9b3566338e6c9311b772e8c8cb4ec027..6eb821a59b493defb7cce604a8380395281ca99b 100644 (file)
--- a/arch/arc/mm/fault.c
+++ b/arch/arc/mm/fault.c
@@ -133,29 +133,21 @@ retry:
 
        fault = handle_mm_fault(vma, address, flags);
 
+       /* Quick path to respond to signals */
+       if (fault_signal_pending(fault, regs)) {
+               if (!user_mode(regs))
+                       goto no_context;
+               return;
+       }
+
        /*
-        * Fault retry nuances
+        * Fault retry nuances, mmap_sem already relinquished by core mm
         */
-       if (unlikely(fault & VM_FAULT_RETRY)) {
-
-               /*
-                * If fault needs to be retried, handle any pending signals
-                * first (by returning to user mode).
-                * mmap_sem already relinquished by core mm for RETRY case
-                */
-               if (fatal_signal_pending(current)) {
-                       if (!user_mode(regs))
-                               goto no_context;
-                       return;
-               }
-               /*
-                * retry state machine
-                */
-               if (flags & FAULT_FLAG_ALLOW_RETRY) {
-                       flags &= ~FAULT_FLAG_ALLOW_RETRY;
-                       flags |= FAULT_FLAG_TRIED;
-                       goto retry;
-               }
+       if (unlikely((fault & VM_FAULT_RETRY) &&
+                    (flags & FAULT_FLAG_ALLOW_RETRY))) {
+               flags &= ~FAULT_FLAG_ALLOW_RETRY;
+               flags |= FAULT_FLAG_TRIED;
+               goto retry;
        }
 
 bad_area: