From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:23800 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727175AbgB1Pnd (ORCPT ); Fri, 28 Feb 2020 10:43:33 -0500 Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 01SFYmLW061588 for ; Fri, 28 Feb 2020 10:43:32 -0500 Received: from e06smtp05.uk.ibm.com (e06smtp05.uk.ibm.com [195.75.94.101]) by mx0b-001b2d01.pphosted.com with ESMTP id 2yepwjb2g6-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 28 Feb 2020 10:43:32 -0500 Received: from localhost by e06smtp05.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 28 Feb 2020 15:43:30 -0000 From: Claudio Imbrenda Subject: [RFC v1 1/2] fixup for 9947ea2c1e608e32669d5caeb67b3e3fba3309e8 "mm/gup: track FOLL_PIN pages" Date: Fri, 28 Feb 2020 16:43:20 +0100 In-Reply-To: <20200228154322.329228-1-imbrenda@linux.ibm.com> References: <20200228154322.329228-1-imbrenda@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Message-Id: <20200228154322.329228-2-imbrenda@linux.ibm.com> Sender: linux-s390-owner@vger.kernel.org List-ID: To: linux-next@vger.kernel.org, akpm@linux-foundation.org Cc: borntraeger@de.ibm.com, david@redhat.com, aarcange@redhat.com, linux-mm@kvack.org, frankja@linux.ibm.com, sfr@canb.auug.org.au, jhubbard@nvidia.com, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org in case pin fails, we need to unpin, just a put_page will not be enough Signed-off-by: Claudio Imbrenda --- mm/gup.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/mm/gup.c b/mm/gup.c index f589299b0d4a..0b9a806898f3 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -2134,7 +2134,10 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end, goto pte_unmap; if (unlikely(pte_val(pte) != pte_val(*ptep))) { - put_page(head); + if (flags & FOLL_GET) + put_page(head); + else if (flags & FOLL_PIN) + unpin_user_page(head); goto pte_unmap; } -- 2.24.1