Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751748AbdILPkD (ORCPT ); Tue, 12 Sep 2017 11:40:03 -0400 Received: from mga02.intel.com ([134.134.136.20]:55809 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751638AbdILPjy (ORCPT ); Tue, 12 Sep 2017 11:39:54 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.42,383,1500966000"; d="scan'208";a="1194271525" From: "Kirill A. Shutemov" To: Andrew Morton , Vlastimil Babka , Vineet Gupta , Russell King , Will Deacon , Catalin Marinas , Ralf Baechle , "David S. Miller" , "Aneesh Kumar K . V" , Martin Schwidefsky , Heiko Carstens , Andrea Arcangeli Cc: linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A . Shutemov" Subject: [PATCHv3 04/11] arm64: Provide pmdp_establish() helper Date: Tue, 12 Sep 2017 18:39:34 +0300 Message-Id: <20170912153941.47012-5-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20170912153941.47012-1-kirill.shutemov@linux.intel.com> References: <20170912153941.47012-1-kirill.shutemov@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1066 Lines: 32 From: Catalin Marinas We need an atomic way to setup pmd page table entry, avoiding races with CPU setting dirty/accessed bits. This is required to implement pmdp_invalidate() that doesn't lose these bits. Signed-off-by: Catalin Marinas Signed-off-by: Kirill A. Shutemov --- arch/arm64/include/asm/pgtable.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index bc4e92337d16..09bb86533d32 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -663,6 +663,13 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm, { ptep_set_wrprotect(mm, address, (pte_t *)pmdp); } + +#define pmdp_establish pmdp_establish +static inline pmd_t pmdp_establish(struct vm_area_struct *vma, + unsigned long address, pmd_t *pmdp, pmd_t pmd) +{ + return __pmd(xchg_relaxed(&pmd_val(*pmdp), pmd_val(pmd))); +} #endif extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; -- 2.14.1