linux-kernel - Re: [PATCH v18 05/10] xbitmap: add more operations

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Message-ID: <20171201141307.GA4722@bombadil.infradead.org>
Date:   Fri, 1 Dec 2017 06:13:07 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:     wei.w.wang@...el.com, virtio-dev@...ts.oasis-open.org,
        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,
        akpm@...ux-foundation.org, mawilcox@...rosoft.com,
        david@...hat.com, cornelia.huck@...ibm.com,
        mgorman@...hsingularity.net, aarcange@...hat.com,
        amit.shah@...hat.com, pbonzini@...hat.com,
        liliang.opensource@...il.com, yang.zhang.wz@...il.com,
        quan.xu@...yun.com, nilal@...hat.com, riel@...hat.com
Subject: Re: [PATCH v18 05/10] xbitmap: add more operations

On Fri, Dec 01, 2017 at 10:02:01PM +0900, Tetsuo Handa wrote:
> If start == end is legal,
> 
>    for (; start < end; start = (start | (IDA_BITMAP_BITS - 1)) + 1) {
> 
> makes this loop do nothing because 10 < 10 is false.

... and this is why we add tests to the test-suite!