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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>
This commit is contained in:
Peter Xu 2020-04-01 21:08:14 -07:00 committed by Linus Torvalds
parent 39678191cd
commit 24a62cf41f
1 changed files with 14 additions and 22 deletions
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36
arch/arc/mm/fault.c
View File

@ -133,29 +133,21 @@ void do_page_fault(unsigned long address, struct pt_regs *regs)
fault = handle_mm_fault(vma, address, flags);
/*
* Fault retry nuances
*/
if (unlikely(fault & VM_FAULT_RETRY)) {
/* Quick path to respond to signals */
if (fault_signal_pending(fault, regs)) {
if (!user_mode(regs))
goto no_context;
return;
}
/*
* 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;
}
/*
* Fault retry nuances, mmap_sem already relinquished by core mm
*/
if (unlikely((fault & VM_FAULT_RETRY) &&
(flags & FAULT_FLAG_ALLOW_RETRY))) {
flags &= ~FAULT_FLAG_ALLOW_RETRY;
flags |= FAULT_FLAG_TRIED;
goto retry;
}
bad_area: