Re: [PATCH] dev->priv to netdev_priv(dev), drivers/net/tokenring/

[Jeff Garzik <jeff@garzik.org>]

Yoann Padioleau wrote:
> Replacing accesses to dev->priv to netdev_priv(dev). The replacment
> is safe when netdev_priv is used to access a private structure that is
> right next to the net_device structure in memory. 
> Cf http://groups.google.com/group/comp.os.linux.development.system/browse_thread/thread/de19321bcd94dbb8/0d74a4adcd6177bd
> This is the case when the net_device structure was allocated with
> a call to alloc_netdev or one of its derivative.
>
> Here is an excerpt of the semantic patch that performs the transformation
>
> @ rule1 @
> type T;
> struct net_device *dev;
> @@
>
>  dev = 
> (
>         alloc_netdev
> | 
>         alloc_etherdev
> |
>         alloc_trdev
> )
>    (sizeof(T), ...)
>
> @ rule1bis @
> struct net_device *dev;
> expression E;
> @@
>  dev->priv = E
>
> @ rule2 depends on rule1 && !rule1bis  @
> struct net_device *dev;
> type rule1.T;
> @@
>
> - (T*) dev->priv
> + netdev_priv(dev)
>
>
> PS: I have performed the same transformation on the whole kernel
> and it affects around 70 files, most of them in drivers/net/.
> Should I split my patch for each subnet directories ? (wireless/, wan/, etc)

applied.  splitting up by sub-directory would be helpful.


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