linux-kernel - Re: [PATCH] Rewrite the MAJOR() macro as a call to imajor().

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Message-ID: <Pine.LNX.4.64.0705040410390.20834@localhost.localdomain>
Date:	Fri, 4 May 2007 04:14:26 -0400 (EDT)
From:	"Robert P. J. Day" <rpjday@...dspring.com>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Rewrite the MAJOR() macro as a call to imajor().

On Fri, 4 May 2007, Jan Engelhardt wrote:

>
> On May 3 2007 23:18, Andrew Morton wrote:
> >>  	struct inode *i = file->f_mapping->host;
> >>
> >> -	return i && S_ISBLK(i->i_mode) && MAJOR(i->i_rdev) == LOOP_MAJOR;
> >> +	return i && S_ISBLK(i->i_mode) && imajor(i) == LOOP_MAJOR;
> >>  }
> >
> >there's no runtime change, and I count a couple hundred MAJORs in the tree.
>
> Why do we even have imajor() if all it does is calling the MAJOR()
> macro?

  i'm guessing it's to hide the underlying implementation of
extracting the major/minor numbers from an inode, in case that
implementation ever changes, which strikes me as perfectly reasonable.
and i don't think you'd have any luck arguing that it should be
removed at this point:

$ grep -Erw "(imajor|iminor)" * | wc -l
350

  all i was doing was standardizing the small handful of holdouts.

rday
-- 
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Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

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