From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl0-f69.google.com (mail-pl0-f69.google.com [209.85.160.69]) by kanga.kvack.org (Postfix) with ESMTP id 042386B0268 for ; Wed, 13 Dec 2017 05:58:40 -0500 (EST) Received: by mail-pl0-f69.google.com with SMTP id 7so910306plb.19 for ; Wed, 13 Dec 2017 02:58:39 -0800 (PST) Received: from mga02.intel.com (mga02.intel.com. [134.134.136.20]) by mx.google.com with ESMTPS id c128si1235821pfg.138.2017.12.13.02.58.38 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 13 Dec 2017 02:58:39 -0800 (PST) From: "Kirill A. Shutemov" Subject: [PATCHv4 04/12] arm64: Provide pmdp_establish() helper Date: Wed, 13 Dec 2017 13:57:48 +0300 Message-Id: <20171213105756.69879-5-kirill.shutemov@linux.intel.com> In-Reply-To: <20171213105756.69879-1-kirill.shutemov@linux.intel.com> References: <20171213105756.69879-1-kirill.shutemov@linux.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: Vlastimil Babka , Andrea Arcangeli , Michal Hocko , linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Catalin Marinas , "Kirill A . Shutemov" 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 149d05fb9421..116d610a2620 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -676,6 +676,13 @@ 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]; -- 2.15.0 -- 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