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From: Peter Xu <peterx@redhat.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: David Hildenbrand <david@redhat.com>,
	Hugh Dickins <hughd@google.com>, Maya Gokhale <gokhale2@llnl.gov>,
	Jerome Glisse <jglisse@redhat.com>,
	Pavel Emelyanov <xemul@virtuozzo.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	peterx@redhat.com, Martin Cracauer <cracauer@cons.org>,
	Matthew Wilcox <willy@infradead.org>, Shaohua Li <shli@fb.com>,
	Marty McFadden <mcfadden8@llnl.gov>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Denis Plotnikov <dplotnikov@virtuozzo.com>,
	Mike Rapoport <rppt@linux.vnet.ibm.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Mel Gorman <mgorman@suse.de>,
	"Kirill A . Shutemov" <kirill@shutemov.name>,
	"Dr . David Alan Gilbert" <dgilbert@redhat.com>
Subject: [PATCH v5 07/16] powerpc/mm: Use helper fault_signal_pending()
Date: Thu, 26 Sep 2019 17:38:55 +0800	[thread overview]
Message-ID: <20190926093904.5090-8-peterx@redhat.com> (raw)
In-Reply-To: <20190926093904.5090-1-peterx@redhat.com>

Let powerpc code to use the new helper, by moving the signal handling
earlier before the retry logic.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 arch/powerpc/mm/fault.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 8432c281de92..7dabd1243f1b 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -583,6 +583,9 @@ static int __do_page_fault(struct pt_regs *regs, unsigned long address,
 
 	major |= fault & VM_FAULT_MAJOR;
 
+	if (fault_signal_pending(fault, regs))
+		return user_mode(regs) ? 0 : SIGBUS;
+
 	/*
 	 * Handle the retry right now, the mmap_sem has been released in that
 	 * case.
@@ -596,15 +599,8 @@ static int __do_page_fault(struct pt_regs *regs, unsigned long address,
 			 */
 			flags &= ~FAULT_FLAG_ALLOW_RETRY;
 			flags |= FAULT_FLAG_TRIED;
-			if (!fatal_signal_pending(current))
-				goto retry;
+			goto retry;
 		}
-
-		/*
-		 * User mode? Just return to handle the fatal exception otherwise
-		 * return to bad_page_fault
-		 */
-		return is_user ? 0 : SIGBUS;
 	}
 
 	up_read(&current->mm->mmap_sem);
-- 
2.21.0


  parent reply	other threads:[~2019-09-26  9:40 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-26  9:38 [PATCH v5 00/16] mm: Page fault enhancements Peter Xu
2019-09-26  9:38 ` [PATCH v5 01/16] mm/gup: Rename "nonblocking" to "locked" where proper Peter Xu
2019-09-26  9:38 ` [PATCH v5 02/16] mm/gup: Fix __get_user_pages() on fault retry of hugetlb Peter Xu
2019-09-26  9:38 ` [PATCH v5 03/16] mm: Introduce fault_signal_pending() Peter Xu
2019-09-26  9:38 ` [PATCH v5 04/16] x86/mm: Use helper fault_signal_pending() Peter Xu
2019-09-26  9:38 ` [PATCH v5 05/16] arc/mm: " Peter Xu
2019-09-26  9:38 ` [PATCH v5 06/16] arm64/mm: " Peter Xu
2019-09-26  9:38 ` Peter Xu [this message]
2019-09-26  9:38 ` [PATCH v5 08/16] sh/mm: " Peter Xu
2019-09-26  9:38 ` [PATCH v5 09/16] mm: Return faster for non-fatal signals in user mode faults Peter Xu
2019-09-26  9:38 ` [PATCH v5 10/16] userfaultfd: Don't retake mmap_sem to emulate NOPAGE Peter Xu
2019-09-26  9:38 ` [PATCH v5 11/16] mm: Introduce FAULT_FLAG_DEFAULT Peter Xu
2019-09-26  9:39 ` [PATCH v5 12/16] mm: Introduce FAULT_FLAG_INTERRUPTIBLE Peter Xu
2019-09-26  9:39 ` [PATCH v5 13/16] mm: Allow VM_FAULT_RETRY for multiple times Peter Xu
2019-09-26  9:39 ` [PATCH v5 14/16] mm/gup: " Peter Xu
2019-09-26  9:39 ` [PATCH v5 15/16] mm/gup: Allow to react to fatal signals Peter Xu
2019-09-26  9:39 ` [PATCH v5 16/16] mm/userfaultfd: Honor FAULT_FLAG_KILLABLE in fault path Peter Xu
2019-09-29  9:16   ` Peter Xu
2019-10-14  8:40 ` [PATCH v5 00/16] mm: Page fault enhancements Peter Xu

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