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3eeec38584
After a lengthy discussion [1] it turned out that RCU does not need a full rcu_irq_enter/exit() when RCU is already watching. All it needs if NOHZ_FULL is active is to check whether the tick needs to be restarted. This allows to avoid a separate variant for the pagefault handler which cannot invoke rcu_irq_enter() on a kernel pagefault which might sleep. The cond_rcu argument is only temporary and will be removed once the existing users of idtentry_enter/exit() have been cleaned up. After that the code can be significantly simplified. [ mingo: Simplified the control flow ] Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: "Paul E. McKenney" <paulmck@kernel.org> Acked-by: Andy Lutomirski <luto@kernel.org> Link: [1] https://lkml.kernel.org/r/20200515235125.628629605@linutronix.de Link: https://lore.kernel.org/r/20200521202117.181397835@linutronix.de |
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