On 2019/3/1 16:43, Sergei Shtylyov wrote:
Hello!
On 01.03.2019 8:56, Su Yanjun wrote:
From: Su Yanjun <suyj.fnst@xxxxxxxxxxxxxx>
Because nf_conntrack_helper_unregister maybe used in an unloadable
module,
it uses 'synchronize_rcu' which may cause kernel panic.
According to the artical:
Article?
I got it.
RCU and Unloadable Modules
https://lwn.net/Articles/217484/
When we have a heavy rcu callback load, then some of the callbacks
might be
deferred in order to allow other processing to proceed.
sychnorize_rcu does
not wait rcu callback complete and module may be unloaded before
callback
done.
This patch uses rcu_barrier instead of synchronize_rcu will prevent this
^ that/which
missed?
Yes.
situation.
Signed-off-by: Su Yanjun <suyj.fnst@xxxxxxxxxxxxxx>
[...]
MBR, Sergei
Thanks.
Su
