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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5E536C433FE for ; Thu, 11 Nov 2021 18:53:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 47926610F8 for ; Thu, 11 Nov 2021 18:53:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234188AbhKKS4B (ORCPT ); Thu, 11 Nov 2021 13:56:01 -0500 Received: from jabberwock.ucw.cz ([46.255.230.98]:33612 "EHLO jabberwock.ucw.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233787AbhKKS4A (ORCPT ); Thu, 11 Nov 2021 13:56:00 -0500 Received: by jabberwock.ucw.cz (Postfix, from userid 1017) id A902F1C0BAC; Thu, 11 Nov 2021 19:53:09 +0100 (CET) Date: Thu, 11 Nov 2021 19:53:08 +0100 From: Pavel Machek To: Zubin Mithra Cc: Greg Kroah-Hartman , linux-kernel@vger.kernel.org, stable@vger.kernel.org, Christoph Hellwig , Omar Sandoval , Ming Lei , Jens Axboe Subject: Re: [PATCH 4.19 01/16] block: introduce multi-page bvec helpers Message-ID: <20211111185308.GA7933@duo.ucw.cz> References: <20211110182001.994215976@linuxfoundation.org> <20211110182002.041203616@linuxfoundation.org> <20211111164754.GA29545@duo.ucw.cz> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="5mCyUwZo2JvN/JJP" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --5mCyUwZo2JvN/JJP Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi! > > > This patch introduces helpers of 'mp_bvec_iter_*' for multi-page bvec > > > support. > > >=20 > > > The introduced helpers treate one bvec as real multi-page segment, > > > which may include more than one pages. > > >=20 > > > The existed helpers of bvec_iter_* are interfaces for supporting curr= ent > > > bvec iterator which is thought as single-page by drivers, fs, dm and > > > etc. These introduced helpers will build single-page bvec in flight, = so > > > this way won't break current bio/bvec users, which needn't any > > > change. > >=20 > > I don't understand why we have this in 4.19-stable. I don't see > > followup patches needing it, and it does not claim to fix a bug. >=20 >=20 > There is some more context on this at: > https://lore.kernel.org/linux-block/YXweJ00CVsDLCI7b@google.com/T/#u > and > https://lore.kernel.org/stable/YYVZBuDaWBKT3vOS@google.com/T/#u Thank you! Pavel =09 --=20 http://www.livejournal.com/~pavelmachek --5mCyUwZo2JvN/JJP Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iF0EABECAB0WIQRPfPO7r0eAhk010v0w5/Bqldv68gUCYY1mlAAKCRAw5/Bqldv6 8vvMAKCMbppninrtAgZkbe2MuItOvGszxQCfVj3ShnFC6ZuRevOSGhJ7A+iu/ek= =j/nP -----END PGP SIGNATURE----- --5mCyUwZo2JvN/JJP--