linux-kernel - thp: gup_fast s390/sparc tail refcounting [was Re: [PATCH] thp: tail page refcounting fix #6]

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Date:	Mon, 17 Oct 2011 16:41:54 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Michel Lespinasse <walken@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <jweiner@...hat.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Shaohua Li <shaohua.li@...el.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: thp: gup_fast s390/sparc tail refcounting [was Re: [PATCH] thp: tail page refcounting fix #6]

Hello everyone,

These last three patches are incremental with the ones sent yesterday
(that in turn are incremental with the hugepage mapcount tail
refcounting race fix in -mm).

These should complete the gup_fast arch updates to support the
tail page mapcount refcounting.

sh is the only other one supporting gup_fast and hugetlbfs, but it
looked ok already so it requires no changes (it uses get_page). The
arch requiring updates can easily be found by searching:

	find arch/ -name hugetlbpage.c -or -name gup.c

I'm still uncertain why all these page_cache_get/add_speculative in
various gup.c and the pte change checks are needed there but I didn't
alter those, so if it worked before it'll still work the same.
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