rcu: Fix RCU CPU stall detection in tiny implementation

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The tiny RCU CPU stall detection depends on *rcp->curtail not being
NULL. It is however a tail pointer and thus NULL by definition. Instead we
should check rcp->rcucblist for the presence of pending callbacks which
need to be processed. With this fix INFO about the stall is printed and
jiffies_stall (jiffies at next stall) correctly updated.

Note that the check for pending callback is necessary to avoid spurious
warnings if there are no pendings callbacks.

Signed-off-by: Miroslav Benes <mbenes@suse.cz>
[ paulmck: Fused identical "if" statements, ported to -rcu. ]
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

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Miroslav Benes 2014-12-22 11:10:12 -08:00 • committed by Paul E. McKenney

parent fb81a44b88

commit ec1fe396ff

1 changed files with 3 additions and 4 deletions

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kernel/rcu/tiny_plugin.h

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