linux-kernel - Re: [PATCH] Revert "mm: rename _count, field of the struct page, to

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Message-ID: <20160616093235.GA14640@infradead.org>
Date:	Thu, 16 Jun 2016 02:32:35 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:	linux-mm@...ck.org, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Vlastimil Babka <vbabka@...e.cz>,
	Hugh Dickins <hughd@...gle.com>, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH] Revert "mm: rename _count, field of the struct page, to
 _refcount"

On Thu, Jun 16, 2016 at 11:22:46AM +0200, Vitaly Kuznetsov wrote:
> _count -> _refcount rename in commit 0139aa7b7fa12 ("mm: rename _count,
> field of the struct page, to _refcount") broke kdump. makedumpfile(8) does
> stuff like READ_MEMBER_OFFSET("page._count", page._count) and fails. While
> it is definitely possible to fix this particular tool I'm not sure about
> other tools which might be doing the same.
> 
> I suggest we remember the "we don't break userspace" rule and revert for
> 4.7 while it's not too late.

Err, sorry - this is not "userspace".  It's crazy crap digging into
kernel internal structure.

The rename was absolutely useful, so fix up your stinking pike in kdump.