From: Ingo Molnar <mingo@elte.hu>
To: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Olaf Hering <olh@suse.de>, Hannes Reinecke <hare@suse.de>,
linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>
Subject: Re: calibrate_migration_costs takes ages on s390
Date: Tue, 14 Feb 2006 13:37:27 +0100 [thread overview]
Message-ID: <20060214123727.GA5451@elte.hu> (raw)
In-Reply-To: <20060214123521.GB3138@elte.hu>
* Ingo Molnar <mingo@elte.hu> wrote:
> * Heiko Carstens <heiko.carstens@de.ibm.com> wrote:
>
> > --- a/arch/s390/lib/delay.c
> > +++ b/arch/s390/lib/delay.c
> > @@ -30,7 +30,7 @@ void __delay(unsigned long loops)
> > */
> > __asm__ __volatile__(
> > "0: brct %0,0b"
> > - : /* no outputs */ : "r" (loops/2) );
> > + : /* no outputs */ : "r" ((loops/2) + 1));
> > }
>
> ahh ... that explains the delays indeed!
just to make sure, i've checked all the other __delay() implementations
in the kernel, and none seems to have such problems.
Ingo
next prev parent reply other threads:[~2006-02-14 12:39 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-13 10:26 calibrate_migration_costs takes ages on s390 Heiko Carstens
2006-02-13 10:34 ` David S. Miller
2006-02-13 10:54 ` Ingo Molnar
2006-02-13 20:57 ` David S. Miller
2006-02-13 10:46 ` Ingo Molnar
2006-02-13 16:13 ` Heiko Carstens
2006-02-13 23:42 ` Olaf Hering
2006-02-14 0:08 ` Olaf Hering
2006-02-14 8:09 ` Heiko Carstens
2006-02-14 10:56 ` Heiko Carstens
2006-02-14 12:35 ` Ingo Molnar
2006-02-14 12:37 ` Ingo Molnar [this message]
2006-02-16 6:27 ` Heiko Carstens
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