Re: CVS commit: src/sys/net

[Joerg Sonnenberger <joerg%bec.de@localhost>]

On Fri, Sep 22, 2017 at 05:05:32AM +0000, Ryota Ozaki wrote:
> Module Name:	src
> Committed By:	ozaki-r
> Date:		Fri Sep 22 05:05:32 UTC 2017
> 
> Modified Files:
> 	src/sys/net: route.c
> 
> Log Message:
> Remove the global lock for rtcache
> 
> Thanks to removal of LIST_ENTRY of struct route, rtcaches are accessed only by
> their users. And in existing usages a rtcache is guranteed to be not accessed
> simultaneously. So the rtcache framework doesn't need any exclusion controls
> in itself.

I'm a bit suspicous about this since the generation counter is not
atomic. So what guarantees that route manipulations of different
subsystems don't race?

Joerg