netdev - Re: [RFC v2] net: Introduce recvmmsg socket syscall

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Date:	Thu, 11 Jun 2009 02:41:00 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	acme@...hat.com
Cc:	netdev@...r.kernel.org, vanhoof@...hat.com, williams@...hat.com,
	caitlin.bestler@...il.com, paul.moore@...com, steve@...gwyn.com,
	remi.denis-courmont@...ia.com, nhorman@...driver.com,
	niv@...ibm.com
Subject: Re: [RFC v2] net: Introduce recvmmsg socket syscall

From: Arnaldo Carvalho de Melo <acme@...hat.com>
Date: Thu, 11 Jun 2009 00:40:22 -0300

> +	struct compat_timespec *timeout_compat =
> +		(struct compat_timespec *)timeout;

In order for this to build on non-compat platforms, or when
CONFIG_COMPAT is disabled, you'll need to avoid trying to
reference compat_timespec.

We get away with compat_msghdr because we define it as a NOP
in net/compat.h when necessary.

Doing the same, and cleanly, with this non-networking compat knob is
unlikely to be straightforward.
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