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=-6.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT 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 6C0E8C433DF for ; Fri, 16 Oct 2020 04:53:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2971E20897 for ; Fri, 16 Oct 2020 04:53:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726710AbgJPExL (ORCPT ); Fri, 16 Oct 2020 00:53:11 -0400 Received: from smtp.infotech.no ([82.134.31.41]:44927 "EHLO smtp.infotech.no" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726305AbgJPExI (ORCPT ); Fri, 16 Oct 2020 00:53:08 -0400 Received: from localhost (localhost [127.0.0.1]) by smtp.infotech.no (Postfix) with ESMTP id 1413D20423B; Fri, 16 Oct 2020 06:53:07 +0200 (CEST) X-Virus-Scanned: by amavisd-new-2.6.6 (20110518) (Debian) at infotech.no Received: from smtp.infotech.no ([127.0.0.1]) by localhost (smtp.infotech.no [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BGf+GG0cu-O0; Fri, 16 Oct 2020 06:53:01 +0200 (CEST) Received: from xtwo70.bingwo.ca (host-104-157-204-209.dyn.295.ca [104.157.204.209]) by smtp.infotech.no (Postfix) with ESMTPA id 07D41204191; Fri, 16 Oct 2020 06:52:59 +0200 (CEST) From: Douglas Gilbert To: linux-scsi@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Cc: martin.petersen@oracle.com, axboe@kernel.dk, bvanassche@acm.org Subject: [PATCH 0/4] scatterlist: add new capabilities Date: Fri, 16 Oct 2020 00:52:54 -0400 Message-Id: <20201016045258.16246-1-dgilbert@interlog.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Scatter-gather lists (sgl_s) are frequently used as data carriers in the block layer. For example the SCSI and NVMe subsystems interchange data with the block layer using sgl_s. The sgl API is declared in The author has extended these transient sgl use cases to a store (i.e. ramdisk) in the scsi_debug driver. Other new potential uses of sgl_s could be for caches. When this extra step is taken, the need to copy between sgl_s becomes apparent. The patchset adds sgl_copy_sgl() and a few other sgl operations. The existing sgl_alloc_order() function can be seen as a replacement for vmalloc() for large, long-term allocations. For what seems like no good reason, sgl_alloc_order() currently restricts its total allocation to less than or equal to 4 GiB. vmalloc() has no such restriction. This patchset is against lk 5.9.0 Douglas Gilbert (4): sgl_alloc_order: remove 4 GiB limit, sgl_free() warning scatterlist: add sgl_copy_sgl() function scatterlist: add sgl_compare_sgl() function scatterlist: add sgl_memset() include/linux/scatterlist.h | 12 +++ lib/scatterlist.c | 204 +++++++++++++++++++++++++++++++++++- 2 files changed, 213 insertions(+), 3 deletions(-) -- 2.25.1