Re: [PATCH] bitmap_equal memcmp optimization for s390

[Martin Schwidefsky]

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

> Martin Schwidefsky <schwidefsky@xxxxxxxxxx> 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.