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rcu/context-tracking: Move deferred nocb resched to context tracking

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To prepare for migrating the RCU eqs accounting code to context tracking,
split the last-resort deferred nocb resched from rcu_user_enter() and
move it into a separate call from context tracking.

Acked-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Neeraj Upadhyay <quic_neeraju@quicinc.com>
Cc: Uladzislau Rezki <uladzislau.rezki@sony.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Nicolas Saenz Julienne <nsaenz@kernel.org>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Cc: Yu Liao <liaoyu15@huawei.com>
Cc: Phil Auld <pauld@redhat.com>
Cc: Paul Gortmaker<paul.gortmaker@windriver.com>
Cc: Alex Belits <abelits@marvell.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Nicolas Saenz Julienne <nsaenzju@redhat.com>
Tested-by: Nicolas Saenz Julienne <nsaenzju@redhat.com>
This commit is contained in:
Frederic Weisbecker 2022-06-08 16:40:32 +02:00 • committed by Paul E. McKenney
parent 95e04f48ec
commit 564506495c
3 changed files with 16 additions and 13 deletions
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8
kernel/context_tracking.c
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@ -177,6 +177,8 @@ static __always_inline void context_tracking_recursion_exit(void)
*/
void noinstr __ct_user_enter(enum ctx_state state)
{
lockdep_assert_irqs_disabled();
/* Kernel threads aren't supposed to go to userspace */
WARN_ON_ONCE(!current->mm);
@ -198,6 +200,12 @@ void noinstr __ct_user_enter(enum ctx_state state)
vtime_user_enter(current);
instrumentation_end();
}
/*
* Other than generic entry implementation, we may be past the last
* rescheduling opportunity in the entry code. Trigger a self IPI
* that will fire and reschedule once we resume in user/guest mode.
*/
rcu_irq_work_resched();
rcu_user_enter();
}
/*