On Thu, Jun 06, 2019 at 09:42:33PM +0800, Herbert Xu wrote:
> On Thu, Jun 06, 2019 at 06:19:33AM -0700, Paul E. McKenney wrote:
> > Commit bb73c52bad36 ("rcu: Don't disable preemption for Tiny and Tree
> > RCU readers") removed the barrier() calls from rcu_read_lock() and
> > rcu_write_lock() in CO
On Thu, Jun 06, 2019 at 06:19:33AM -0700, Paul E. McKenney wrote:
> Commit bb73c52bad36 ("rcu: Don't disable preemption for Tiny and Tree
> RCU readers") removed the barrier() calls from rcu_read_lock() and
> rcu_write_lock() in CONFIG_PREEMPT=n&&CONFIG_PREEMPT_COUNT=n kernels.
> Within RCU, this c
Commit bb73c52bad36 ("rcu: Don't disable preemption for Tiny and Tree
RCU readers") removed the barrier() calls from rcu_read_lock() and
rcu_write_lock() in CONFIG_PREEMPT=n&&CONFIG_PREEMPT_COUNT=n kernels.
Within RCU, this commit was OK, but it failed to account for things like
get_user() that can
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