linux-kernel - Re: [PATCH] bitmap_equal memcmp optimization for s390

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Message-ID: <28415.1465482407@warthog.procyon.org.uk>
Date:	Thu, 09 Jun 2016 15:26:47 +0100
From:	David Howells <dhowells@...hat.com>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:	dhowells@...hat.com, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] bitmap_equal memcmp optimization for s390

Martin Schwidefsky <schwidefsky@...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