Message ID | 20200220155927.9264-1-peterx@redhat.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
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Thu, 20 Feb 2020 07:59:30 -0800 (PST) Received: from xz-x1.redhat.com ([104.156.64.75]) by smtp.gmail.com with ESMTPSA id f2sm1705818qkm.81.2020.02.20.07.59.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Feb 2020 07:59:29 -0800 (PST) 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> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200220155353.8676-1-peterx@redhat.com> References: MIME-Version: 1.0 X-MC-Unique: dFgRnTj_O1qQHe58Jvrq8A-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: <linux-mm.kvack.org> |
Series |
mm: Page fault enhancements
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expand
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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.
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(-)