Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2992658AbbEPCLJ (ORCPT ); Fri, 15 May 2015 22:11:09 -0400 Received: from eddie.linux-mips.org ([148.251.95.138]:41762 "EHLO cvs.linux-mips.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2992583AbbEPCLG (ORCPT ); Fri, 15 May 2015 22:11:06 -0400 Date: Sat, 16 May 2015 03:11:01 +0100 (BST) From: "Maciej W. Rozycki" To: Leonid Yegoshin cc: David Daney , "aleksey.makarov@auriga.com" , James Hogan , Paul Burton , "david.daney@cavium.com" , "peterz@infradead.org" , "linux-mips@linux-mips.org" , "linux-kernel@vger.kernel.org" , "ralf@linux-mips.org" , "davidlohr@hp.com" , "kirill@shutemov.name" , "akpm@linux-foundation.org" , "mingo@kernel.org" Subject: Re: [PATCH v2] MIPS64: Support of at least 48 bits of SEGBITS In-Reply-To: <55564319.7020502@imgtec.com> Message-ID: References: <20150515013351.7450.12130.stgit@ubuntu-yegoshin> <55561EB6.4020009@gmail.com> <55564319.7020502@imgtec.com> User-Agent: Alpine 2.11 (LFD 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 918 Lines: 22 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 right above the change you made there. Maciej -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/