From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Dominik Dingel Subject: [PATCH 0/2] Allow gmap fault to retry Date: Thu, 19 Nov 2015 00:49:56 +0100 Message-Id: <1447890598-56860-1-git-send-email-dingel@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-Archive: List-Post: To: linux-s390@vger.kernel.org, linux-mm@kvack.org Cc: Andrew Morton , "Kirill A. Shutemov" , Andrea Arcangeli , David Rientjes , Eric B Munson , Naoya Horiguchi , Mel Gorman , Martin Schwidefsky , Heiko Carstens , Dominik Dingel , Christian Borntraeger , Paolo Bonzini , "Jason J. Herne" , linux-kernel@vger.kernel.org List-ID: Hello, during Jasons work with postcopy migration support for s390 a problem regarding gmap faults was discovered. The gmap code will call fixup_userfault which will end up always in handle_mm_fault. Till now we never cared about retries, but as the userfaultfd code kind of relies on it, this needed some fix. This patchset includes the retry logic fory gmap fault scenarios, as well as passing back VM_FAULT_RETRY from fixup_userfault. Thanks, Dominik Dominik Dingel (2): mm: fixup_userfault returns VM_FAULT_RETRY if asked s390/mm: allow gmap code to retry on faulting in guest memory arch/s390/mm/pgtable.c | 28 ++++++++++++++++++++++++---- mm/gup.c | 2 ++ 2 files changed, 26 insertions(+), 4 deletions(-) -- 2.3.9 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org