rcu: Make __call_rcu() handle invocation from idle

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Although __call_rcu() is handled correctly when called from a momentary
non-idle period, if it is called on a CPU that RCU believes to be idle
on RCU_FAST_NO_HZ kernels, the callback might be indefinitely postponed.
This commit therefore ensures that RCU is aware of the new callback and
has a chance to force the CPU out of dyntick-idle mode when a new callback
is posted.

Reported-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

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Paul E. McKenney 2012-05-22 22:10:24 -07:00 • committed by Paul E. McKenney

parent 28f5c693d0

commit 62fde6edf1

2 changed files with 13 additions and 15 deletions

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13

include/linux/rcupdate.h

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15

kernel/rcutree.c

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