Subject: Re: linux-next: upstream tree build warnings

From: David Miller <[email-masked]>
Date: Thu, 23 Apr 2009 00:24:03 -0700 (PDT)

From: Stephen Rothwell <[email-masked]>
Date: Thu, 23 Apr 2009 16:38:47 +1000

> Today's linux-next build (powerpc allyesconfig gcc4.4.0) produced these
> warnings:
> 
> drivers/net/virtio_net.c: In function 'virnet_vlan_rx_add_vid':
> include/linux/scatterlist.h:57: warning: 'sg' is used uninitialized in this function
> drivers/net/virtio_net.c:746: note: 'sg' was declared here
> drivers/net/virtio_net.c: In function 'virnet_vlan_rx_kill_vid':
> include/linux/scatterlist.h:57: warning: 'sg' is used uninitialized in this function
> drivers/net/virtio_net.c:758: note: 'sg' was declared here
> 
> in each case, sg is uninitialised when its address is passed to
> sg_set_buf() which passes it to gs_set_page() which passes it to
> sg_assign_page() which dereferences it (to use ->page_link).

I wonder if this is a side effect of changes that went in via Rusty's
tree?  I don't remember touching this driver in a while.