netdev - Re: [PATCH net-next 3/9] ipv4: remove static flush

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Date:	Mon, 07 Jul 2008 01:43:06 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Denis V. Lunev" <den@...nvz.org>
Cc:	davem@...emloft.net, containers@...ts.osdl.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next 3/9] ipv4: remove static flush_delay variable

"Denis V. Lunev" <den@...nvz.org> writes:

> flush delay is used as an external storage for net.ipv4.route.flush sysctl
> entry. It is write-only.
>
> The ctl_table->data for this entry is used once. Fix this case to point
> to the stack to remove global variable. Do this to avoid additional
> variable on struct net in the next patch.
>
> Possible race (as it was before) accessing this local variable is removed
> using flush_mutex.

FYI.  You can avoid the locking entirely by defining a local struct ctl_table variable
on the stack.

Eric
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