Subject: Re: [Fwd: Re: connector is missing in 2.6.12-rc2-mm1]
From: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Reply-To: johnpol@2ka.mipt.ru
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: akpm@osdl.org, guillaume.thouvenin@bull.net, greg@kroah.com,
       linux-kernel@vger.kernel.org, "David S. Miller" <davem@davemloft.net>
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Organization: MIPT
Date: Fri, 08 Apr 2005 09:19:39 +0400
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On Fri, 2005-04-08 at 15:08 +1000, Herbert Xu wrote:
> On Fri, Apr 08, 2005 at 09:11:56AM +0400, Evgeniy Polyakov wrote:
> >
> > > Yes but what will go wrong on uni-processor MIPS when you don't do th=
e
> > > sync in atomic_sub_return?
> >=20
> > Sync synchornizes cached mamory access,
> > without it new value may be stored only into cache,
> > but not into memory.
>=20
> I know, the same thing holds for most architectures, including i386.
> However, this is not an issue for uni-processor kernels anywhere else,
> so what's so special about MIPS?

Does i386 or ppc has cached and uncached memory?
No, i386, ppc and others do not require sync on uncached memory access,
and only instruction not data cache sync on SMP.

> Cheers,
--=20
        Evgeniy Polyakov

Crash is better than data corruption -- Arthur Grabowski

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