linux-kernel - Re: [PATCH v20 1/7] xbitmap: Introduce xbitmap

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Message-ID: <CAOFm3uHJF1X93iALES6njXrkpsk5bSsuXqcKQMWP4HGT0S8qeg@mail.gmail.com>
Date:   Tue, 19 Dec 2017 16:58:10 +0100
From:   Philippe Ombredanne <pombredanne@...b.com>
To:     mawilcox@...rosoft.com
Cc:     virtio-dev@...ts.oasis-open.org,
        LKML <linux-kernel@...r.kernel.org>, qemu-devel@...gnu.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-mm@...ck.org, mst@...hat.com, mhocko@...nel.org,
        Andrew Morton <akpm@...ux-foundation.org>, david@...hat.com,
        penguin-kernel@...ove.sakura.ne.jp, cornelia.huck@...ibm.com,
        mgorman@...hsingularity.net, aarcange@...hat.com,
        amit.shah@...hat.com, Paolo Bonzini <pbonzini@...hat.com>,
        willy@...radead.org, liliang.opensource@...il.com,
        yang.zhang.wz@...il.com, quan.xu0@...il.com, nilal@...hat.com,
        riel@...hat.com
Subject: Re: [PATCH v20 1/7] xbitmap: Introduce xbitmap

Matthew,

On Tue, Dec 19, 2017 at 1:17 PM, Wei Wang <wei.w.wang@...el.com> wrote:
> From: Matthew Wilcox <mawilcox@...rosoft.com>
>
> The eXtensible Bitmap is a sparse bitmap representation which is
> efficient for set bits which tend to cluster.  It supports up to
> 'unsigned long' worth of bits, and this commit adds the bare bones --
> xb_set_bit(), xb_clear_bit() and xb_test_bit().

<snip>

> --- /dev/null
> +++ b/include/linux/xbitmap.h
> @@ -0,0 +1,49 @@
> +/*
> + * eXtensible Bitmaps
> + * Copyright (c) 2017 Microsoft Corporation <mawilcox@...rosoft.com>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of the
> + * License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * eXtensible Bitmaps provide an unlimited-size sparse bitmap facility.
> + * All bits are initially zero.
> + */

Would you mind using the new SPDX tags documented in Thomas patch set
[1] rather than this fine but longer legalese?

And if you could spread the word to others in your team this would be very nice.

Thank you!

[1] https://lkml.org/lkml/2017/12/4/934

-- 
Cordially
Philippe Ombredanne