forked from Minki/linux
0598a4d442
rcu_core() tries to ensure that its self-invocation in case of callbacks overload only happen in softirq/rcuc mode. Indeed it doesn't make sense to trigger local RCU core from nocb_cb kthread since it can execute on a CPU different from the target rdp. Also in case of overload, the nocb_cb kthread simply iterates a new loop of callbacks processing. However the "offloaded" check that aims at preventing misplaced rcu_core() invocations is wrong. First of all that state is volatile and second: softirq/rcuc can execute while the target rdp is offloaded. As a result rcu_core() can be invoked on the wrong CPU while in the process of (de-)offloading. Fix that with moving the rcu_core() self-invocation to rcu_core() itself, irrespective of the rdp offloaded state. Tested-by: Valentin Schneider <valentin.schneider@arm.com> Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Cc: Valentin Schneider <valentin.schneider@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Joel Fernandes <joel@joelfernandes.org> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Neeraj Upadhyay <neeraju@codeaurora.org> Cc: Uladzislau Rezki <urezki@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> |
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| .. | ||
| Kconfig | ||
| Kconfig.debug | ||
| Makefile | ||
| rcu_segcblist.c | ||
| rcu_segcblist.h | ||
| rcu.h | ||
| rcuscale.c | ||
| rcutorture.c | ||
| refscale.c | ||
| srcutiny.c | ||
| srcutree.c | ||
| sync.c | ||
| tasks.h | ||
| tiny.c | ||
| tree_exp.h | ||
| tree_nocb.h | ||
| tree_plugin.h | ||
| tree_stall.h | ||
| tree.c | ||
| tree.h | ||
| update.c | ||