From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Nick Piggin <npiggin@suse.de>
Cc: linuxppc-dev@ozlabs.org, paulus@samba.org
Subject: Re: [patch 2/2] powerpc: optimise smp_wmb
Date: Wed, 21 May 2008 12:02:15 -0400 [thread overview]
Message-ID: <1211385735.8297.204.camel@pasglop> (raw)
In-Reply-To: <20080521154701.GH8897@wotan.suse.de>
On Wed, 2008-05-21 at 17:47 +0200, Nick Piggin wrote:
>
> OK, but I just don't understand what the problem is... your synch.h
> has
>
> #ifdef __powerpc64__
> #define __SUBARCH_HAS_LWSYNC
> #endif
>
> #ifdef __SUBARCH_HAS_LWSYNC
> # define LWSYNC lwsync
> #else
> # define LWSYNC sync
> #endif
>
This is mostly useless then since lwsync is just a sync to a processor
that doesn't know it (it's a sync with a reservd bit set) :-) Or it's
just to make gas happy if you specify a processor type that doesn't have
lwsync ?
Paul, do we have a case of a 32 bits CPU that chokes on the added bit ?
Ben.
next prev parent reply other threads:[~2008-05-21 16:02 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-21 14:10 [patch 1/2] powerpc: rmb fix Nick Piggin
2008-05-21 14:12 ` [patch 2/2] powerpc: optimise smp_wmb Nick Piggin
2008-05-21 15:26 ` Benjamin Herrenschmidt
2008-05-21 15:34 ` Nick Piggin
2008-05-21 15:43 ` Benjamin Herrenschmidt
2008-05-21 15:47 ` Nick Piggin
2008-05-21 16:02 ` Benjamin Herrenschmidt [this message]
2008-05-21 20:51 ` Segher Boessenkool
2008-05-21 16:01 ` Nick Piggin
2008-05-21 20:12 ` Segher Boessenkool
2008-05-21 20:44 ` Benjamin Herrenschmidt
2008-05-21 22:07 ` Segher Boessenkool
2008-05-22 0:30 ` Nick Piggin
2008-05-21 20:16 ` Segher Boessenkool
2008-05-21 15:27 ` [patch 1/2] powerpc: rmb fix Benjamin Herrenschmidt
2008-05-21 15:32 ` Nick Piggin
2008-05-21 15:43 ` Benjamin Herrenschmidt
2008-05-23 2:14 ` Paul Mackerras
2008-05-23 4:40 ` Nick Piggin
2008-05-23 4:53 ` Paul Mackerras
2008-05-23 5:48 ` Nick Piggin
2008-05-23 6:40 ` Paul Mackerras
2008-05-26 1:38 ` Nick Piggin
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