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

[Robert P. J. Day]

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

http://fsdev.net/wiki/index.php?title=Main_Page
========================================================================
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/