From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:62606 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728187AbgBNW1r (ORCPT ); Fri, 14 Feb 2020 17:27:47 -0500 From: Christian Borntraeger Subject: [PATCH v2 40/42] example for future extension: mm:gup/writeback: add callbacks for inaccessible pages: source indication Date: Fri, 14 Feb 2020 17:26:56 -0500 Message-Id: <20200214222658.12946-41-borntraeger@de.ibm.com> In-Reply-To: <20200214222658.12946-1-borntraeger@de.ibm.com> References: <20200214222658.12946-1-borntraeger@de.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-s390-owner@vger.kernel.org List-ID: To: Christian Borntraeger , Janosch Frank , Andrew Morton Cc: KVM , Cornelia Huck , David Hildenbrand , Thomas Huth , Ulrich Weigand , Claudio Imbrenda , linux-s390 , Michael Mueller , Vasily Gorbik , Andrea Arcangeli , linux-mm@kvack.org, Will Deacon , Sean Christopherson From: Claudio Imbrenda We might want to do different things depending on where we are coming from. Cc: Will Deacon Cc: Sean Christopherson Signed-off-by: Claudio Imbrenda [borntraeger@de.ibm.com: patch description] Signed-off-by: Christian Borntraeger --- include/linux/gfp.h | 8 +++++++- mm/gup.c | 4 ++-- mm/page-writeback.c | 2 +- 3 files changed, 10 insertions(+), 4 deletions(-) diff --git a/include/linux/gfp.h b/include/linux/gfp.h index be2754841369..a15fcb361e7c 100644 --- a/include/linux/gfp.h +++ b/include/linux/gfp.h @@ -485,8 +485,14 @@ static inline void arch_free_page(struct page *page, int order) { } #ifndef HAVE_ARCH_ALLOC_PAGE static inline void arch_alloc_page(struct page *page, int order) { } #endif +enum access_type { + MAKE_ACCESSIBLE_GENERIC, + MAKE_ACCESSIBLE_GET, + MAKE_ACCESSIBLE_GET_FAST, + MAKE_ACCESSIBLE_WRITEBACK +}; #ifndef HAVE_ARCH_MAKE_PAGE_ACCESSIBLE -static inline int arch_make_page_accessible(struct page *page) +static inline int arch_make_page_accessible(struct page *page, int where) { return 0; } diff --git a/mm/gup.c b/mm/gup.c index 354bcfbd844b..ce962c155724 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -274,7 +274,7 @@ static struct page *follow_page_pte(struct vm_area_struct *vma, page = ERR_PTR(-ENOMEM); goto out; } - ret = arch_make_page_accessible(page); + ret = arch_make_page_accessible(page, MAKE_ACCESSIBLE_GET); if (ret) { put_page(page); page = ERR_PTR(ret); @@ -1923,7 +1923,7 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end, VM_BUG_ON_PAGE(compound_head(page) != head, page); - ret = arch_make_page_accessible(page); + ret = arch_make_page_accessible(page, MAKE_ACCESSIBLE_GET_FAST); if (ret) { put_page(head); goto pte_unmap; diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 558d7063c117..f85148e59800 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -2811,7 +2811,7 @@ int __test_set_page_writeback(struct page *page, bool keep_write) * If writeback has been triggered on a page that cannot be made * accessible, it is too late. */ - WARN_ON(arch_make_page_accessible(page)); + WARN_ON(arch_make_page_accessible(page, MAKE_ACCESSIBLE_WRITEBACK)); return ret; } -- 2.25.0