netdev - Re: [PATCH] af_packet: flush complete kernel cache in packet

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Date:	Fri, 02 Sep 2011 14:46:17 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Phil Sutter <phil.sutter@...rinet.com>
Cc:	linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] af_packet: flush complete kernel cache in packet_sendmsg

On Fri, 2011-09-02 at 13:08 +0200, Phil Sutter wrote:
> This flushes the cache before and after accessing the mmapped packet
> buffer. It seems like the call to flush_dcache_page from inside
> __packet_get_status is not enough on Kirkwood (or ARM in general).
> ---
> I know this is far from an optimal solution, but it's in fact the only working
> one I found.
[...]

This is ridiculous.  If flush_dcache_page() isn't doing everything it
should, you need to fix that.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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