linux-kernel - Re: [PATCH v2] MIPS64: Support of at least 48 bits of SEGBITS

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Date:	Sat, 16 May 2015 03:11:01 +0100 (BST)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Leonid Yegoshin <Leonid.Yegoshin@...tec.com>
cc:	David Daney <ddaney.cavm@...il.com>,
	"aleksey.makarov@...iga.com" <aleksey.makarov@...iga.com>,
	James Hogan <James.Hogan@...tec.com>,
	Paul Burton <Paul.Burton@...tec.com>,
	"david.daney@...ium.com" <david.daney@...ium.com>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ralf@...ux-mips.org" <ralf@...ux-mips.org>,
	"davidlohr@...com" <davidlohr@...com>,
	"kirill@...temov.name" <kirill@...temov.name>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mingo@...nel.org" <mingo@...nel.org>
Subject: Re: [PATCH v2] MIPS64: Support of at least 48 bits of SEGBITS

On Fri, 15 May 2015, Leonid Yegoshin wrote:

> > Many processors support larger VA space than is utilized by the kernel.
> >    A choice was made to reduce the size of the VA space in order to
> > reduce TLB handling overhead.
> >
> > If the true reason for the patch is to enable larger VA space, say that.
> >    But is it really required by those processors you mention?  I doubt it.
> 
> Well, I was not aware about many processors capability, I can't find this kind
> of note anywhere.

 The R10000 and friends all have a 44-bit virtual address space, so this 
is no news to Linux.  This is noted in <asm/processor.h> right above the 
change you made there.

  Maciej
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