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Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1joAP1-0002a5-3g; Wed, 24 Jun 2020 18:45:43 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1joAOw-0002YR-Dx for linux-arm-kernel@lists.infradead.org; Wed, 24 Jun 2020 18:45:39 +0000 Received: from X1 (nat-ab2241.sltdut.senawave.net [162.218.216.4]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DD3422081A; Wed, 24 Jun 2020 18:45:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593024337; bh=E6OIJZbTsXd21Iy1/vA8hcrT6xT8e3j93Tf+tQvTOd0=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=aJJ1kYS2JPdRjBiUDYlM1E78ZAi58Fy8LC3g2QYZh12Sn2tApP6Kwm7cI4tu/pu61 Sl/mqCEM0Tu/Q/bGjgux7NDEVs/kzhMSJy7EVQJr1PBu/ghV1L777kBPawqt+VfAf4 CGOgekjAlBc2SccextFmczx29bANPvB4Figc71Zc= Date: Wed, 24 Jun 2020 11:45:34 -0700 From: Andrew Morton To: Catalin Marinas Subject: Re: [PATCH v5 21/25] mm: Add arch hooks for saving/restoring tags Message-Id: <20200624114534.9520ba5ed235bc32bf1af3a2@linux-foundation.org> In-Reply-To: <20200624175244.25837-22-catalin.marinas@arm.com> References: <20200624175244.25837-1-catalin.marinas@arm.com> <20200624175244.25837-22-catalin.marinas@arm.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.32; x86_64-pc-linux-gnu) Mime-Version: 1.0 X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, Szabolcs Nagy , Andrey Konovalov , Kevin Brodsky , Steven Price , Peter Collingbourne , linux-mm@kvack.org, Vincenzo Frascino , Will Deacon , Dave P Martin , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, 24 Jun 2020 18:52:40 +0100 Catalin Marinas wrote: > From: Steven Price > > Arm's Memory Tagging Extension (MTE) adds some metadata (tags) to > every physical page, when swapping pages out to disk it is necessary to > save these tags, and later restore them when reading the pages back. > > Add some hooks along with dummy implementations to enable the > arch code to handle this. > > Three new hooks are added to the swap code: > * arch_prepare_to_swap() and > * arch_swap_invalidate_page() / arch_swap_invalidate_area(). > One new hook is added to shmem: > * arch_swap_restore_tags() > > ... > > --- a/include/linux/pgtable.h > +++ b/include/linux/pgtable.h > @@ -631,6 +631,29 @@ static inline int arch_unmap_one(struct mm_struct *mm, > } > #endif > > +#ifndef __HAVE_ARCH_PREPARE_TO_SWAP > +static inline int arch_prepare_to_swap(struct page *page) > +{ > + return 0; > +} > +#endif > + > +#ifndef __HAVE_ARCH_SWAP_INVALIDATE > +static inline void arch_swap_invalidate_page(int type, pgoff_t offset) > +{ > +} > + > +static inline void arch_swap_invalidate_area(int type) > +{ > +} > +#endif > + > +#ifndef __HAVE_ARCH_SWAP_RESTORE_TAGS > +static inline void arch_swap_restore_tags(swp_entry_t entry, struct page *page) > +{ > +} > +#endif Presumably these three __HAVE_ARCH_ macros are to be defined in asm/pgtable.h? Acked-by: Andrew Morton _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel