From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail137.messagelabs.com (mail137.messagelabs.com [216.82.249.19]) by kanga.kvack.org (Postfix) with ESMTP id B7D6F6B002D for ; Fri, 11 Nov 2011 03:38:25 -0500 (EST) Received: by vws16 with SMTP id 16so4342729vws.14 for ; Fri, 11 Nov 2011 00:38:23 -0800 (PST) MIME-Version: 1.0 In-Reply-To: <1320985863.21206.40.camel@pasglop> References: <20110412151116.B50D.A69D9226@jp.fujitsu.com> <4EBC085D.3060107@jp.fujitsu.com> <1320959579.21206.24.camel@pasglop> <1320985863.21206.40.camel@pasglop> Date: Fri, 11 Nov 2011 16:38:22 +0800 Message-ID: Subject: Re: mm: convert vma->vm_flags to 64bit From: Nai Xia Content-Type: text/plain; charset=ISO-8859-1 Sender: owner-linux-mm@kvack.org List-ID: To: Benjamin Herrenschmidt Cc: Hugh Dickins , KOSAKI Motohiro , Linus Torvalds , linux-kernel@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, dave@linux.vnet.ibm.com, kamezawa.hiroyu@jp.fujitsu.com, lethal@linux-sh.org, linux@arm.linux.org.uk On Fri, Nov 11, 2011 at 12:31 PM, Benjamin Herrenschmidt wrote: > On Thu, 2011-11-10 at 18:09 -0800, Hugh Dickins wrote: >> It was in this mail below, when Andrew sent Linus the patch, and Linus >> opposed my "argument" in support: that wasn't on lkml or linux-mm, >> but I don't see that its privacy needs protecting. >> >> KOSAKI-san then sent instead a patch to correct some ints to longs, >> which Linus did put in: but changing them to a new "vm_flags_t". >> >> He was, I think, hoping that one of us would change all the other uses >> of unsigned long vm_flags to vm_flags_t; but in fact none of us has >> stepped up yet - yeah, we're still sulking that we didn't get our >> shiny new 64-bit vm_flags ;) >> >> I think Linus is not opposed to PowerPC and others defining a 64-bit >> vm_flags_t if you need it, but wants not to bloat the x86_32 vma. >> >> I'm still wary of the contortions we go to in constraining flags, >> and feel that the 32-bit case holds back the 64-bit, which would >> not itself be bloated at all. >> >> The subject is likely to come up again, more pressingly, with page >> flags. > > Right, tho the good first step is to convert everything to vm_flags_t so > we can easily switch if we want to, even on a per-arch basis... > > Oh well, now all we need is a volunteer :-) Maybe a "Kernel Common Resource Authority" is needed for all similar requests, just like IANA for IP addresses... :) Thanks, Nai > > Cheers, > Ben. > > > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org