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=-2.3 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham 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 8F026C43441 for ; Thu, 29 Nov 2018 03:11:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 515F9206B2 for ; Thu, 29 Nov 2018 03:11:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="M9JucVAL" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 515F9206B2 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727474AbeK2OPY (ORCPT ); Thu, 29 Nov 2018 09:15:24 -0500 Received: from mail-pg1-f193.google.com ([209.85.215.193]:36883 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727022AbeK2OPY (ORCPT ); Thu, 29 Nov 2018 09:15:24 -0500 Received: by mail-pg1-f193.google.com with SMTP id 80so253296pge.4 for ; Wed, 28 Nov 2018 19:11:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=J+YsAacigZRSuSF1fzrWioRQGakHZlB28wt6JpZmGgE=; b=M9JucVALYGmONvtgBTRWy1az0iOLff6IXUQ8MMzH7DPQPaRU73g25IiVO631VnNCid GXlUT4DEgheHYLUf/wKnM93YkFaVFimHBl8Dy0Z7WG/AFldypw9JQvLdMKg5ZeYgLa9Q B9oKYS5Xj/MN1k9x3MT24IZal4TRq4BEy9LviCic2blOOyYf3q1OuwMXlopLCTdSMrYC vzxBPmkpkCHKO2AJc9+aRFmHgvRn+tdMpyDd1NJDvZPsQNLK2V1UzKpfbdhp9Rk3KwFD Uuo0OXA9WNcGmfhpMQ5Yz3UwxXc2NW3HkHy5mKWgdWOMx781nU7CV5hSE3xOZpZ/EI30 f5gA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=J+YsAacigZRSuSF1fzrWioRQGakHZlB28wt6JpZmGgE=; b=RxrlhyIKWnPwTxPK6ru+Oi+5mjNpzwEpXDitNSIDtASKsGN8W3MY1bs7AZIZEHskl5 +m27O0bpywBPfX/n9OEMpnej8UhcYhSuhlFoWr9TBGHr+1oE6kchDbC8BQAVM4//v1Fw hQCdH7nGHY2CilNlhqxwychPHMoqTYzgcW7PBcPAXdImV832htl92QZY4iaLkGkcbklf EfTP8JEX58xSueNQcd15Q06X04V2qB7vPoeGP2+S3W3NofK1DmU7mf4t/v4Dm0GFkALn JlfjOfSEuBzJgs/wRvWtz8asDBO6MldTU9PbsOUwM9OWakthNAlEl/CmglzgmCyQT7mL tKlg== X-Gm-Message-State: AA+aEWYVRpOzJ+QAars13qcNcaHDORlazXpDc/sI4Jye0349wJit/SGb hXGYIrtbOu7oYikXUt7KYdQ= X-Google-Smtp-Source: AFSGD/WXrp5TEyOsSvgWW17pD2+tNoh7wBBquEoaQmi+5RNvgsI+z68lEkiDKJCdd6o7wboadzLOwg== X-Received: by 2002:a62:c185:: with SMTP id i127mr8802046pfg.43.1543461093601; Wed, 28 Nov 2018 19:11:33 -0800 (PST) Received: from localhost ([175.223.15.27]) by smtp.gmail.com with ESMTPSA id f13sm468065pfa.132.2018.11.28.19.11.31 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 28 Nov 2018 19:11:32 -0800 (PST) Date: Thu, 29 Nov 2018 12:11:29 +0900 From: Sergey Senozhatsky To: Dave Rodgman Cc: "linux-kernel@vger.kernel.org" , nd , "herbert@gondor.apana.org.au" , "davem@davemloft.net" , Matt Sealey , "nitingupta910@gmail.com" , "rpurdie@openedhand.com" , "markus@oberhumer.com" , "minchan@kernel.org" , "sonnyrao@google.com" , "gregkh@linuxfoundation.org" , "akpm@linux-foundation.org" , Sergey Senozhatsky Subject: Re: [PATCH 6/7] lib/lzo: implement run-length encoding Message-ID: <20181129031129.GG6379@jagdpanzerIV> References: <20181127161913.23863-1-dave.rodgman@arm.com> <20181127161913.23863-7-dave.rodgman@arm.com> <20181129030840.GF6379@jagdpanzerIV> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181129030840.GF6379@jagdpanzerIV> User-Agent: Mutt/1.11.0 (2018-11-25) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On (11/29/18 12:08), Sergey Senozhatsky wrote: > On (11/27/18 16:19), Dave Rodgman wrote: > > > > This modifies the bitstream in a way which is backwards compatible > > (i.e., we can decompress old bitstreams, but old versions of lzo > > cannot decompress new bitstreams). > > > > Hmmm... Whoa. Help me understand this: > > So a btrfs filesystem, compressed with the new lzo, say I run 4.21, > won't be readable at all once I reboot under 4.19? > > What about compressed net traffic between servers running different > kernel version (one with new lzo, the other one with old lzo)? > XFRM can be compressed with lzo, can't it? Ah, false alarm. Sorry for the noise! You create a new lzo version in the next patch. -ss