linux-kernel - Re: [PATCH v2] posix_types.h: make __NFDBITS compatible with glibc definition

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Date:	Tue, 24 Jul 2012 13:26:39 -0600
From:	Jeff Law <law@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Josh Boyer <jwboyer@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] posix_types.h: make __NFDBITS compatible with glibc
 definition

On 07/24/12 13:24, Linus Torvalds wrote:
> On Tue, Jul 24, 2012 at 12:15 PM, Jeff Law <law@...hat.com> wrote:
>>
>> Please refer to the original discussion where they did evaluate the cost of
>> this change and tested that the final change made no difference to the
>> generated code.
>
> Umm. That bugzilla entry seems to be talking about a *sane* change, namely
>
> -  ({ unsigned long int __d = (d);					    \
> +  ({ unsigned long int __d = (unsigned long int) (d);			    \
>
> in __FD_ELT(), which is totally different from the one Josh talks about.
Right.  Josh's change is necessary to prevent warnings from folks 
(incorrectly) using posix_types.h instead of select.h after the change 
in that BZ was made.  That's why I originally stated that, arguably, 
posix_types.h really should go away or just use the definitions provided 
by glibc.


Jeff
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