linux-kernel - COMPACTION and TRANSPARENT

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Date:	Sat, 22 Jan 2011 15:48:03 +0100
From:	Luca Tettamanti <kronos.it@...il.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: COMPACTION and TRANSPARENT_HUGEPAGE config warning

Hello Andrea,
this commit:

commit 5d6892407cab23d4bf2f6de065ca351a53849323
Author: Andrea Arcangeli <aarcange@...hat.com>
Date:   Thu Jan 13 15:47:07 2011 -0800

    thp: select CONFIG_COMPACTION if TRANSPARENT_HUGEPAGE enabled

causes this warning during the configuration process:

warning: (TRANSPARENT_HUGEPAGE) selects COMPACTION which has unmet
direct dependencies (EXPERIMENTAL && HUGETLB_PAGE && MMU)

This happens because 'select' does not enable the dependencies of its
target, so when I selected THP it also enabled COMPATION but I don't
have HUGETLBFS (=HUGETLB_PAGE) enabled.
Making THP select HUGETLB_PAGE fixes the warning but I'm not 100% sure
that's correct (does it work without HUGETLBFS?).

Luca
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