linux-kernel - Re: [PATCH 16/21] s390: Use generic posix

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Date:	Wed, 8 Feb 2012 19:01:17 +0100
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>, linux390@...ibm.com
Subject: Re: [PATCH 16/21] s390: Use generic posix_types.h

On Wed, 08 Feb 2012 08:55:13 -0800
"H. Peter Anvin" <hpa@...or.com> wrote:

> On 02/08/2012 01:04 AM, Martin Schwidefsky wrote:
> > On Tue,  7 Feb 2012 21:09:00 -0800
> > "H. Peter Anvin" <hpa@...or.com> wrote:
> > 
> >> From: "H. Peter Anvin" <hpa@...or.com>
> >>
> >> Change the s390 architecture to use <asm-generic/posix_types.h>.
> >>
> >> Signed-off-by: H. Peter Anvin <hpa@...or.com>
> >> Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
> >> Cc: Heiko Carstens <heiko.carstens@...ibm.com>
> >> Cc: <linux390@...ibm.com>
> >> ---
> >>  arch/s390/include/asm/posix_types.h |   70 +++++------------------------------
> >>  1 files changed, 10 insertions(+), 60 deletions(-)
> > 
> > I carefully checked the conversion and came to the conclusion that the new type
> > definitions are equivalent to the old ones. The code compiles fine with the
> > patches applied and the kernel boots.
> > What I don't like is the conversion of __FD_ZERO. The new definition creates
> > this code sequence:
> > 
> 
> It shouldn't matter:
> 
> a. __FD_ZERO seems to actually be unused in the current kernel.
> b. The last patch in the series deletes the generic __FD_ZERO and
>    replaces it with memset().  If there are any magic optimizations an
>    architecture wants to do, they belong in memset().

Ah, cool. In this case:
Acked-by: Martin Schwidefsky <schwidefsky@...ibm.com>

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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