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From:   Peter Xu <peterx@redhat.com>
To:     linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc:     Peter Xu <peterx@redhat.com>, Martin Cracauer <cracauer@cons.org>,
        Mike Rapoport <rppt@linux.vnet.ibm.com>,
        Hugh Dickins <hughd@google.com>,
        Jerome Glisse <jglisse@redhat.com>,
        "Kirill A . Shutemov" <kirill@shutemov.name>,
        Matthew Wilcox <willy@infradead.org>,
        Pavel Emelyanov <xemul@virtuozzo.com>,
        Brian Geffon <bgeffon@google.com>,
        Maya Gokhale <gokhale2@llnl.gov>,
        Denis Plotnikov <dplotnikov@virtuozzo.com>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        "Dr . David Alan Gilbert" <dgilbert@redhat.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Marty McFadden <mcfadden8@llnl.gov>,
        David Hildenbrand <david@redhat.com>,
        Bobby Powers <bobbypowers@gmail.com>,
        Mel Gorman <mgorman@suse.de>
Subject: [PATCH RESEND v6 06/16] arm64/mm: Use helper fault_signal_pending()
Date:   Thu, 20 Feb 2020 10:59:27 -0500
Message-Id: <20200220155927.9264-1-peterx@redhat.com>
In-Reply-To: <20200220155353.8676-1-peterx@redhat.com>
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Let the arm64 fault handling to use the new fault_signal_pending()
helper, by moving the signal handling out of the retry logic.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 arch/arm64/mm/fault.c | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 85566d32958f..6f4b69d712b1 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -513,19 +513,14 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
 	fault = __do_page_fault(mm, addr, mm_flags, vm_flags);
 	major |= fault & VM_FAULT_MAJOR;
 
-	if (fault & VM_FAULT_RETRY) {
-		/*
-		 * If we need to retry but a fatal signal is pending,
-		 * handle the signal first. We do not need to release
-		 * the mmap_sem because it would already be released
-		 * in __lock_page_or_retry in mm/filemap.c.
-		 */
-		if (fatal_signal_pending(current)) {
-			if (!user_mode(regs))
-				goto no_context;
-			return 0;
-		}
+	/* Quick path to respond to signals */
+	if (fault_signal_pending(fault, regs)) {
+		if (!user_mode(regs))
+			goto no_context;
+		return 0;
+	}
 
+	if (fault & VM_FAULT_RETRY) {
 		/*
 		 * Clear FAULT_FLAG_ALLOW_RETRY to avoid any risk of
 		 * starvation.
-- 
2.24.1