netdev - Re: [RFC] memory barrier cleanups

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Message-Id: <20061206.164729.41652274.davem@davemloft.net>
Date:	Wed, 06 Dec 2006 16:47:29 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	ralf@...ux-mips.org
Cc:	netdev@...r.kernel.org
Subject: Re: [RFC] memory barrier cleanups

From: Ralf Baechle <ralf@...ux-mips.org>
Date: Wed, 6 Dec 2006 21:49:46 +0000

> I believe all the below memory barriers only matter on SMP so therefore
> the smp_* variant of the barrier should be used.
> 
> I'm wondering if the barrier in net/ipv4/inet_timewait_sock.c should be
> dropped entirely.  schedule_work's implementation currently implies a
> memory barrier and I think sane semantics of schedule_work() should imply
> a memory barrier, as needed so the caller shouldn't have to worry.
> It's not quite obvious why the barrier in net/packet/af_packet.c is
> needed; maybe it should be implied through flush_dcache_page?
> 

I'll check out that timewait sock case later, but AF_PACKET mmap() is
totally broken on D-cache aliasing architectures.  Many years ago
I tried to fix this up with Alexey but those talks went nowhere :)

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