linux-kernel - Re: [PATCH v4 0/9] Update to zstd-1.4.6

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Date:   Fri, 2 Oct 2020 07:54:54 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Nick Terrell <terrelln@...com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Nick Terrell <nickrterrell@...il.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        Btrfs BTRFS <linux-btrfs@...r.kernel.org>,
        "squashfs-devel@...ts.sourceforge.net" 
        <squashfs-devel@...ts.sourceforge.net>,
        "linux-f2fs-devel@...ts.sourceforge.net" 
        <linux-f2fs-devel@...ts.sourceforge.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>, Chris Mason <clm@...com>,
        Petr Malat <oss@...at.biz>, Johannes Weiner <jweiner@...com>,
        Niket Agarwal <niketa@...com>, Yann Collet <cyan@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v4 0/9] Update to zstd-1.4.6

On Wed, Sep 30, 2020 at 08:05:45PM +0000, Nick Terrell wrote:
> 
> 
> > On Sep 29, 2020, at 11:53 PM, Christoph Hellwig <hch@...radead.org> wrote:
> > 
> > As you keep resend this I keep retelling you that should not do it.
> > Please provide a proper Linux API, and switch to that.  Versioned APIs
> > have absolutely no business in the Linux kernel.
> 
> The API is not versioned. We provide a stable ABI for a large section of our API,
> and the parts that aren???t ABI stable don???t change in semantics, and undergo long
> deprecation periods before being removed.
> 
> The change of callers is a one-time change to transition from the existing API
> in the kernel, which was never upstream's API, to upstream's API.

Again, please transition it to a sane kernel API.  We don't have an
"upstream" in this case.