linux-kernel - Re: [PATCH -mm] mm: Unify pte_to_pgoff and pgoff_to

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Message-Id: <20130814003336.0fb2a275.akpm@linux-foundation.org>
Date:	Wed, 14 Aug 2013 00:33:36 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Cyrill Gorcunov <gorcunov@...il.com>,
	Andy Lutomirski <luto@...capital.net>,
	Pavel Emelyanov <xemul@...allels.com>,
	Matt Mackall <mpm@...enic.com>,
	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Peter Zijlstra <peterz@...radead.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH -mm] mm: Unify pte_to_pgoff and pgoff_to_pte helpers

On Wed, 14 Aug 2013 00:31:12 -0700 "H. Peter Anvin" <hpa@...or.com> wrote:

> On 08/14/2013 12:24 AM, Cyrill Gorcunov wrote:
> > On Wed, Aug 14, 2013 at 12:22:37AM -0700, H. Peter Anvin wrote:
> >> On 08/14/2013 12:00 AM, Cyrill Gorcunov wrote:
> >>> +#define pte_bfop(v,r,m,l)	((((v) >> (r)) & (m)) << (l))
> >>
> >> "bfop"?
> > 
> > B_it_F_ield_OP_eration, Peter I don't mind to use any other
> > name, this was just short enough to type.
> > 
> 
> I think it would be useful to have a comment what it means and what
> v,r,m,l represent.

Can it be written in C with types and proper variable names and such
radical stuff?

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