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70ae7b0ce0
An early check on synchronize_rcu[_expedited]() tries to determine if the current CPU is in UP mode on an SMP no-preempt kernel, in which case there is no need to start a grace period since the current assumed quiescent state is all we need. However the preemption mode doesn't take into account the boot selected preemption mode under CONFIG_PREEMPT_DYNAMIC=y, missing a possible early return if the running flavour is "none" or "voluntary". Use the shiny new preempt mode accessors to fix this. However, avoid invoking them during early boot because doing so triggers a WARN_ON_ONCE(). [ paulmck: Update for mainlined API. ] Reported-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Cc: Uladzislau Rezki <uladzislau.rezki@sony.com> Cc: Joel Fernandes <joel@joelfernandes.org> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Neeraj Upadhyay <quic_neeraju@quicinc.com> Cc: Valentin Schneider <valentin.schneider@arm.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> |
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| .. | ||
| Kconfig | ||
| Kconfig.debug | ||
| Makefile | ||
| rcu.h | ||
| rcu_segcblist.c | ||
| rcu_segcblist.h | ||
| rcuscale.c | ||
| rcutorture.c | ||
| refscale.c | ||
| srcutiny.c | ||
| srcutree.c | ||
| sync.c | ||
| tasks.h | ||
| tiny.c | ||
| tree.c | ||
| tree.h | ||
| tree_exp.h | ||
| tree_nocb.h | ||
| tree_plugin.h | ||
| tree_stall.h | ||
| update.c | ||