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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2011-08-21 03:29:32 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2011-09-29 06:38:48 +0200 |
| commit | e90c53d3e238dd0b7b02964370e8fece1778df96 (patch) | |
| tree | 23e5b8623c2c37bd8a4656c66266209872f80701 /kernel/sys.c | |
| parent | rcu: Wire up RCU_BOOST_PRIO for rcutree (diff) | |
| download | linux-e90c53d3e238dd0b7b02964370e8fece1778df96.tar.xz linux-e90c53d3e238dd0b7b02964370e8fece1778df96.zip | |
rcu: Remove rcu_needs_cpu_flush() to avoid false quiescent states
The purpose of rcu_needs_cpu_flush() was to iterate on pushing the
current grace period in order to help the current CPU enter dyntick-idle
mode. However, this can result in failures if the CPU starts entering
dyntick-idle mode, but then backs out. In this case, the call to
rcu_pending() from rcu_needs_cpu_flush() might end up announcing a
non-existing quiescent state.
This commit therefore removes rcu_needs_cpu_flush() in favor of letting
the dyntick-idle machinery at the end of the softirq handler push the
loop along via its call to rcu_pending().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/sys.c')
0 files changed, 0 insertions, 0 deletions