From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Howells <dhowells@redhat.com>
Subject: Re: [PATCH] bitmap_equal memcmp optimization for s390
Date: Thu, 09 Jun 2016 15:26:47 +0100
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To: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: dhowells@redhat.com, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, Benjamin Herrenschmidt <benh@kernel.crashing.org>, "David S. Miller" <davem@davemloft.net>

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__.

David