From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id CD2DCC433F5 for ; Fri, 18 Mar 2022 11:33:16 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 23C1B8D0002; Fri, 18 Mar 2022 07:33:16 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 1C5218D0001; Fri, 18 Mar 2022 07:33:16 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 03DF08D0002; Fri, 18 Mar 2022 07:33:15 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (relay.hostedemail.com [64.99.140.25]) by kanga.kvack.org (Postfix) with ESMTP id E22A68D0001 for ; Fri, 18 Mar 2022 07:33:15 -0400 (EDT) Received: from smtpin13.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id AC62F24FE1 for ; Fri, 18 Mar 2022 11:33:15 +0000 (UTC) X-FDA: 79257295950.13.178E101 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by imf27.hostedemail.com (Postfix) with ESMTP id F3CB640023 for ; Fri, 18 Mar 2022 11:33:14 +0000 (UTC) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 6049EB8219E; Fri, 18 Mar 2022 11:33:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 81840C340E8; Fri, 18 Mar 2022 11:33:04 +0000 (UTC) Date: Fri, 18 Mar 2022 11:33:00 +0000 From: Catalin Marinas To: David Hildenbrand Cc: linux-kernel@vger.kernel.org, Andrew Morton , Hugh Dickins , Linus Torvalds , David Rientjes , Shakeel Butt , John Hubbard , Jason Gunthorpe , Mike Kravetz , Mike Rapoport , Yang Shi , "Kirill A . Shutemov" , Matthew Wilcox , Vlastimil Babka , Jann Horn , Michal Hocko , Nadav Amit , Rik van Riel , Roman Gushchin , Andrea Arcangeli , Peter Xu , Donald Dutile , Christoph Hellwig , Oleg Nesterov , Jan Kara , Liang Zhang , Pedro Gomes , Oded Gabbay , Will Deacon , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , linux-mm@kvack.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org Subject: Re: [PATCH v1 4/7] arm64/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Message-ID: References: <20220315141837.137118-1-david@redhat.com> <20220315141837.137118-5-david@redhat.com> <8989a07b-3a5b-0c81-983f-b35403d19579@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8989a07b-3a5b-0c81-983f-b35403d19579@redhat.com> X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: F3CB640023 Authentication-Results: imf27.hostedemail.com; dkim=none; spf=pass (imf27.hostedemail.com: domain of cmarinas@kernel.org designates 145.40.68.75 as permitted sender) smtp.mailfrom=cmarinas@kernel.org; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=arm.com (policy=none) X-Rspam-User: X-Stat-Signature: i6tpo3b34ne7tyqtqzt91ouopyg1wbf8 X-HE-Tag: 1647603194-960851 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Mar 18, 2022 at 10:59:10AM +0100, David Hildenbrand wrote: > diff --git a/arch/arm64/include/asm/pgtable-prot.h b/arch/arm64/include/asm/pgtable-prot.h > index b1e1b74d993c..fd6ddf14c190 100644 > --- a/arch/arm64/include/asm/pgtable-prot.h > +++ b/arch/arm64/include/asm/pgtable-prot.h > @@ -14,6 +14,7 @@ > * Software defined PTE bits definition. > */ > #define PTE_WRITE (PTE_DBM) /* same as DBM (51) */ > +#define PTE_SWP_EXCLUSIVE (PTE_TABLE_BIT) /* only for swp ptes */ > #define PTE_DIRTY (_AT(pteval_t, 1) << 55) > #define PTE_SPECIAL (_AT(pteval_t, 1) << 56) > #define PTE_DEVMAP (_AT(pteval_t, 1) << 57) > diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h > index 94e147e5456c..c78994073cd0 100644 > --- a/arch/arm64/include/asm/pgtable.h > +++ b/arch/arm64/include/asm/pgtable.h > @@ -402,6 +402,22 @@ static inline pgprot_t mk_pmd_sect_prot(pgprot_t prot) > return __pgprot((pgprot_val(prot) & ~PMD_TABLE_BIT) | PMD_TYPE_SECT); > } > > +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE > +static inline pte_t pte_swp_mkexclusive(pte_t pte) > +{ > + return set_pte_bit(pte, __pgprot(PTE_SWP_EXCLUSIVE)); > +} > + > +static inline int pte_swp_exclusive(pte_t pte) > +{ > + return pte_val(pte) & PTE_SWP_EXCLUSIVE; > +} > + > +static inline pte_t pte_swp_clear_exclusive(pte_t pte) > +{ > + return clear_pte_bit(pte, __pgprot(PTE_SWP_EXCLUSIVE)); > +} > + > #ifdef CONFIG_NUMA_BALANCING > /* > * See the comment in include/linux/pgtable.h > @@ -908,7 +924,8 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma, > > /* > * Encode and decode a swap entry: > - * bits 0-1: present (must be zero) > + * bits 0: present (must be zero) > + * bits 1: remember PG_anon_exclusive It looks fine to me. Reviewed-by: Catalin Marinas