On Wed, 2015-09-02 at 14:52 -0700, Martin KaFai Lau wrote:
> On Wed, Sep 02, 2015 at 02:30:45PM -0700, Eric Dumazet wrote:
> > Object cannot be freed until all cpus have exited their RCU sections.
> You meant the dst_destroy() here will wait for all cpus exited their RCU
> sections?
>
> static inline void dst_free(struct dst_entry *dst)
> {
> if (dst->obsolete > 0)
> return;
> if (!atomic_read(&dst->__refcnt)) {
> dst = dst_destroy(dst);
> if (!dst)
> return;
> }
> __dst_free(dst);
> }
dst_free() is called after RCU grace period, in the case you are
interested in.
Look at dst_rcu_free() and rt_free()
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