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 X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 46940C433E7 for ; Tue, 13 Oct 2020 20:32:46 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7182620714 for ; Tue, 13 Oct 2020 20:32:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7182620714 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=zeniv.linux.org.uk Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A4E026E941; Tue, 13 Oct 2020 20:32:44 +0000 (UTC) X-Greylist: delayed 1797 seconds by postgrey-1.36 at gabe; Tue, 13 Oct 2020 20:32:43 UTC Received: from ZenIV.linux.org.uk (zeniv.linux.org.uk [IPv6:2002:c35c:fd02::1]) by gabe.freedesktop.org (Postfix) with ESMTPS id 691D06E941; Tue, 13 Oct 2020 20:32:43 +0000 (UTC) Received: from viro by ZenIV.linux.org.uk with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kSQUX-00H96b-NT; Tue, 13 Oct 2020 20:01:49 +0000 Date: Tue, 13 Oct 2020 21:01:49 +0100 From: Al Viro To: Matthew Wilcox Message-ID: <20201013200149.GI3576660@ZenIV.linux.org.uk> References: <20201009195033.3208459-1-ira.weiny@intel.com> <20201009195033.3208459-34-ira.weiny@intel.com> <20201013193643.GK20115@casper.infradead.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20201013193643.GK20115@casper.infradead.org> Subject: Re: [Intel-gfx] [PATCH RFC PKS/PMEM 33/58] fs/cramfs: Utilize new kmap_thread() X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-aio@kvack.org, linux-efi , KVM list , Linux Doc Mailing List , Peter Zijlstra , linux-mmc@vger.kernel.org, Dave Hansen , Maling list - DRI developers , Linux MM , target-devel@vger.kernel.org, linux-mtd@lists.infradead.org, linux-kselftest@vger.kernel.org, samba-technical@lists.samba.org, "Weiny, Ira" , Dan Williams , drbd-dev@lists.linbit.com, devel@driverdev.osuosl.org, linux-cifs@vger.kernel.org, linux-nilfs@vger.kernel.org, linux-scsi , linux-nvdimm , linux-rdma , X86 ML , ceph-devel@vger.kernel.org, amd-gfx list , io-uring@vger.kernel.org, cluster-devel@redhat.com, Ingo Molnar , intel-wired-lan@lists.osuosl.org, xen-devel , linux-ext4 , Fenghua Yu , linux-afs@lists.infradead.org, linux-um@lists.infradead.org, intel-gfx@lists.freedesktop.org, ecryptfs@vger.kernel.org, linux-erofs@lists.ozlabs.org, reiserfs-devel@vger.kernel.org, linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, Borislav Petkov , Andy Lutomirski , Thomas Gleixner , Andrew Morton , linux-cachefs@redhat.com, linux-nfs@vger.kernel.org, Nicolas Pitre , linux-ntfs-dev@lists.sourceforge.net, Netdev , Kexec Mailing List , Linux Kernel Mailing List , linux-f2fs-devel@lists.sourceforge.net, linux-fsdevel , bpf@vger.kernel.org, linuxppc-dev , linux-btrfs Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Tue, Oct 13, 2020 at 08:36:43PM +0100, Matthew Wilcox wrote: > static inline void copy_to_highpage(struct page *to, void *vfrom, unsigned int size) > { > char *vto = kmap_atomic(to); > > memcpy(vto, vfrom, size); > kunmap_atomic(vto); > } > > in linux/highmem.h ? You mean, like static void memcpy_from_page(char *to, struct page *page, size_t offset, size_t len) { char *from = kmap_atomic(page); memcpy(to, from + offset, len); kunmap_atomic(from); } static void memcpy_to_page(struct page *page, size_t offset, const char *from, size_t len) { char *to = kmap_atomic(page); memcpy(to + offset, from, len); kunmap_atomic(to); } static void memzero_page(struct page *page, size_t offset, size_t len) { char *addr = kmap_atomic(page); memset(addr + offset, 0, len); kunmap_atomic(addr); } in lib/iov_iter.c? FWIW, I don't like that "highpage" in the name and highmem.h as location - these make perfect sense regardless of highmem; they are normal memory operations with page + offset used instead of a pointer... _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx