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

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Message-ID: <20130814082000.GN2869@moon>
Date:	Wed, 14 Aug 2013 12:20:00 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"H. Peter Anvin" <hpa@...or.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, Aug 14, 2013 at 01:08:56AM -0700, Andrew Morton wrote:
> > 
> > > Can it be written in C with types and proper variable names and such
> > > radical stuff?
> > 
> > Could you elaborate? You mean inline helper or macro with type checks?
> 
> /*
>  * description goes here
>  */
> static inline pteval_t pte_bfop(pteval_t val, int rightshift, ...)
> {
> 	...
> }
> 
> So much better!  We really should only implement code in a macro if it
> *has* to be done as a macro and I don't think that's the case here?

Well, I'll have to check if it really doesn't generate additional
instructions in generated code, since it's hotpath. I'll ping back
once things are done.
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