On Fri, Oct 09, 2015 at 08:45:42PM +0200, Arnd Bergmann wrote: > A recent change to the dst_output handling caused a new warning > when the call to NF_HOOK() is the only used of a local variable > passed as 'dev', and CONFIG_NETFILTER is disabled: > > net/ipv6/ip6_output.c: In function 'ip6_output': > net/ipv6/ip6_output.c:135:21: warning: unused variable 'dev' > [-Wunused-variable] > > The reason for this is that the NF_HOOK macro in this case does > not reference the variable at all, and the call to dev_net(dev) > got removed from the ip6_output function. To avoid that warning now > and in the future, this changes the macro into an equivalent > inline function, which tells the compiler that the variable is > passed correctly but still unused. > > The dn_forward function apparently had the same problem in > the past and added a local workaround that no longer works > with the inline function. In order to avoid a regression, we > have to also remove the #ifdef from decnet in the same patch.
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