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| author | Thomas Gleixner <tglx@linutronix.de> | 2016-03-03 10:52:10 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-03-03 10:52:10 +0100 |
| commit | 71f87b2fc64c2e9b6d53cb817f28711b959d3dfe (patch) | |
| tree | 1be0de7afced46cfca629dcbfc1807280c50bb13 /lib/genalloc.c | |
| parent | 27d50c7eeb0f03c3d3ca72aac4d2dd487ca1f3f0 (diff) | |
| download | op-kernel-dev-71f87b2fc64c2e9b6d53cb817f28711b959d3dfe.zip op-kernel-dev-71f87b2fc64c2e9b6d53cb817f28711b959d3dfe.tar.gz | |
cpu/hotplug: Plug death reporting race
Paul noticed that the conversion of the death reporting introduced a race
where the outgoing cpu might be delayed after waking the controll processor,
so it might not be able to call rcu_report_dead() before being physically
removed, leading to RCU stalls.
We cant call complete after rcu_report_dead(), so instead of going back to
busy polling, simply issue a function call to do the completion.
Fixes: 27d50c7eeb0f "rcu: Make CPU_DYING_IDLE an explicit call"
Reported-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20160302201127.GA23440@linux.vnet.ibm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Diffstat (limited to 'lib/genalloc.c')
0 files changed, 0 insertions, 0 deletions
