On 12/28/2021 4:49 PM, Jakub Kicinski wrote:

sock.h is pretty heavily used (5k objects rebuilt on x86 after
it's touched). We can drop the include of filter.h from it and
add a forward declaration of struct sk_filter instead.
This decreases the number of rebuilt objects when bpf.h
is touched from ~5k to ~1k.

There's a lot of missing includes this was masking. Primarily
in networking tho, this time.

Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Acked-by: Florian Fainelli <f.fainelli@gmail.com>

It would be nice if we used the number of files rebuilt because of a 
header file change as another metric that the kernel is evaluated with 
from release to release (or even on a commit by commit basis). Food for 
thought.
-- 
Florian