netdev - Re: [PATCH v2 1/4] net: Find the nesting level of a given device by type.

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Date:	Fri, 16 May 2014 10:32:48 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Vlad Yasevich <vyasevic@...hat.com>
Cc:	netdev@...r.kernel.org, dingtianhong@...wei.com, kaber@...sh.net,
	vfalico@...il.com, jiri@...nulli.us
Subject: Re: [PATCH v2 1/4] net: Find the nesting level of a given device by
 type.

On Fri, 2014-05-16 at 13:18 -0400, Vlad Yasevich wrote:
> Multiple devices in the kernel can be stacked/nested and they
> need to know their nesting level for the purposes of lockdep.
> This patch provides a generic function that determines a nesting
> level of a particular device by its type (ex: vlan, macvlan, etc).
> We only care about nesting of the same type of devices.
> 
> For example:
>   eth0 <- vlan0.10 <- macvlan0 <- vlan1.20
> 
> The nesting level of vlan1.20 would be 1, since there is another vlan
> in the stack under it.
> 
> Signed-off-by: Vlad Yasevich <vyasevic@...hat.com>
> ---
>  include/linux/netdevice.h | 10 ++++++++++
>  net/core/dev.c            | 48 +++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 58 insertions(+)

Nice, but if LOCKDEP is not used, do we really want to have
dev_get_nest_level() being something else than a constant ?





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