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

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Date:	Thu, 23 Apr 2015 15:41:57 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	Zhang Zhen <zhenzhang.zhang@...wei.com>,
	Linux MM <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"catalin.marinas@....com" <catalin.marinas@....com>,
	"james.hogan@...tec.com" <james.hogan@...tec.com>,
	"ralf@...ux-mips.org" <ralf@...ux-mips.org>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
	"schwidefsky@...ibm.com" <schwidefsky@...ibm.com>,
	"cmetcalf@...hip.com" <cmetcalf@...hip.com>,
	"David Rientjes" <rientjes@...gle.com>,
	"James.Yang@...escale.com" <James.Yang@...escale.com>,
	"aneesh.kumar@...ux.vnet.ibm.com" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH] mm/hugetlb: reduce arch dependent code about
 huge_pmd_unshare

On Thu, 23 Apr 2015 22:26:18 +0000 "Luck, Tony" <tony.luck@...el.com> wrote:

> > 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?
> 
> Potentially laziness/ignorance-of-feature?  It looks like this feature started on x86_64 and then spread
> to arm*.

Yes.  In 3212b535f200c85b5a6 Steve Capper (ARM person) hoisted the code
out of x86 into generic, then made arm use it.

We're not (I'm not) very good about letting arch people know about such
things.  I wonder how to fix that; does linux-arch work?

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