linux-kernel - Re: [PATCH] mm/hugetlb: reduce arch dependent code about huge_pmd

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Message-Id: <20150423151118.40c41fb1810f2aaa877163ae@linux-foundation.org>
Date:	Thu, 23 Apr 2015 15:11:18 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Zhang Zhen <zhenzhang.zhang@...wei.com>
Cc:	Linux MM <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	<linux@....linux.org.uk>, <catalin.marinas@....com>,
	<tony.luck@...el.com>, <james.hogan@...tec.com>,
	<ralf@...ux-mips.org>, <benh@...nel.crashing.org>,
	<schwidefsky@...ibm.com>, <cmetcalf@...hip.com>,
	David Rientjes <rientjes@...gle.com>,
	<James.Yang@...escale.com>, <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH] mm/hugetlb: reduce arch dependent code about
 huge_pmd_unshare

On Tue, 14 Apr 2015 15:35:04 +0800 Zhang Zhen <zhenzhang.zhang@...wei.com> wrote:

> Currently we have many duplicates in definitions of huge_pmd_unshare.
> In all architectures this function just returns 0 when
> CONFIG_ARCH_WANT_HUGE_PMD_SHARE is N.
> 
> This patch put the default implementation in mm/hugetlb.c and lets
> these architecture use the common code.

Memory fails me.  Why do some architectures (arm, arm64, x86_64) want
huge_pmd_[un]share() while other architectures (ia64, tile, mips,
powerpc, metag, sh, s390) do not?

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