linux-kernel - Re: [PATCH v17 2/6] radix tree test suite: add tests for xbitmap

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Date:   Mon, 6 Nov 2017 09:00:00 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Wei Wang <wei.w.wang@...el.com>
Cc:     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,
        penguin-kernel@...ove.SAKURA.ne.jp, 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
Subject: Re: [PATCH v17 2/6] radix tree test suite: add tests for xbitmap

On Fri, Nov 03, 2017 at 04:13:02PM +0800, Wei Wang wrote:
> From: Matthew Wilcox <mawilcox@...rosoft.com>
> 
> Add the following tests for xbitmap:
> 1) single bit test: single bit set/clear/find;
> 2) bit range test: set/clear a range of bits and find a 0 or 1 bit in
> the range.
> 
> Signed-off-by: Wei Wang <wei.w.wang@...el.com>
> Cc: Matthew Wilcox <mawilcox@...rosoft.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Michael S. Tsirkin <mst@...hat.com>
> ---
>  tools/include/linux/bitmap.h            |  34 ++++
>  tools/include/linux/kernel.h            |   2 +
>  tools/testing/radix-tree/Makefile       |   7 +-
>  tools/testing/radix-tree/linux/kernel.h |   2 -
>  tools/testing/radix-tree/main.c         |   5 +
>  tools/testing/radix-tree/test.h         |   1 +
>  tools/testing/radix-tree/xbitmap.c      | 278 ++++++++++++++++++++++++++++++++

Umm.  No.  You've duplicated xbitmap.c into the test framework, so now it can
slowly get out of sync with the one in lib/.  That's not OK.

Put it back the way it was, with the patch I gave you as patch 1/n
(relocating xbitmap.c from tools/testing/radix-tree to lib/).
Then add your enhancements as patch 2/n.  All you should need to
change in your 1/n from
http://git.infradead.org/users/willy/linux-dax.git/commit/727e401bee5ad7d37e0077291d90cc17475c6392
is a bit of Makefile tooling.  Leave the test suite embedded in the file;
that way people might remember to update the test suite when adding
new functionality.