On 14.01.2016 23:20, Eric Dumazet wrote:
On Thu, 2016-01-14 at 23:02 +0100, Hannes Frederic Sowa wrote:
We are just adding a second recursion limit solely to openvswitch which
has the same problem:
https://patchwork.ozlabs.org/patch/566769/
This time also we depend on rcu_read_lock marking the section being
nonpreemptible. Nice would be a more generic solution here which doesn't
need to always add something to *current.
Note that rcu_read_lock() does not imply that preemption is disabled.
Exactly, it is conditional on CONFIG_PREEMPT_CPU/CONFIG_PREMPT_COUNT but
haven't thought about exactly that in this moment.
I will resend this patch with better protection.
Thanks Eric!
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