Re: [PATCH] bitmap_equal memcmp optimization for s390

From	Martin Schwidefsky <schwidefsky@de.ibm.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] bitmap_equal memcmp optimization for s390
Date	2016-06-09 16:50 +0200
Message-ID	<rI9rs-7FY-31@gated-at.bofh.it> (permalink)
References	<rI985-7ym-19@gated-at.bofh.it> <rI985-7ym-17@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu, 09 Jun 2016 15:26:47 +0100
David Howells <dhowells@redhat.com> wrote:

> Martin Schwidefsky <schwidefsky@de.ibm.com> wrote:
> 
> > I hesitate to put another CONFIG_S390 into common code, alternatively
> > __HAVE_ARCH_MEMCMP could be used. There are 7 architectures with the
> > define: arc, arm64, blackfin, frv, powerpc, s390 and sparc.
> > Of those I guess only powerpc, s390 and sparc will have configs with
> > (NR_CPUS > BITS_PER_LONG). For (NR_CPUS <= BITS_PER_LONG) the xor
> > optimization is used.
> 
> FRV doesn't have __HAVE_ARCH_MEMCMP for __KERNEL__.

Yes indeed. How strange to define __HAVE_ARCH_xxx for user space only.

-- 
blue skies,
   Martin.

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

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Re: [PATCH] bitmap_equal memcmp optimization for s390 David Howells <dhowells@redhat.com> - 2016-06-09 16:30 +0200
  Re: [PATCH] bitmap_equal memcmp optimization for s390 Martin Schwidefsky <schwidefsky@de.ibm.com> - 2016-06-09 16:50 +0200

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