linux-kernel - Re: [PATCH v18 01/10] idr: add #include <linux/bug.h>

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Date:   Wed, 29 Nov 2017 16:58:17 -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, nilal@...hat.com, riel@...hat.com,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Subject: Re: [PATCH v18 01/10] idr: add #include <linux/bug.h>

On Wed, Nov 29, 2017 at 09:55:17PM +0800, Wei Wang wrote:
> The <linux/bug.h> was removed from radix-tree.h by the following commit:
> f5bba9d11a256ad2a1c2f8e7fc6aabe6416b7890.
> 
> Since that commit, tools/testing/radix-tree/ couldn't pass compilation
> due to: tools/testing/radix-tree/idr.c:17: undefined reference to
> WARN_ON_ONCE. This patch adds the bug.h header to idr.h to solve the
> issue.

Thanks; I sent this same patch out yesterday.

Unfortunately, you didn't cc the author of this breakage, Masahiro Yamada.
I want to highlight that these kinds of header cleanups are risky,
and very low reward.  I really don't want to see patches going all over
the tree randomly touching header files.  If we've got a real problem
to solve, then sure.  But I want to see a strong justification for any
more header file cleanups.