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

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Message-ID: <4F32A8F1.1080001@zytor.com>
Date:	Wed, 08 Feb 2012 08:55:13 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Martin Schwidefsky <schwidefsky@...ibm.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 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().

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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