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srcu: Add cleanup_srcu_struct_quiesced()

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The current cleanup_srcu_struct() flushes work, which prevents it
from being invoked from some workqueue contexts, as well as from
atomic (non-blocking) contexts.  This patch therefore introduced a
cleanup_srcu_struct_quiesced(), which can be invoked only after all
activity on the specified srcu_struct has completed.  This restriction
allows cleanup_srcu_struct_quiesced() to be invoked from workqueue
contexts as well as from atomic contexts.

Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Nitzan Carmi <nitzanc@mellanox.com>
Tested-by: Nicholas Piggin <npiggin@gmail.com>
This commit is contained in:
Paul E. McKenney
2018-04-05 17:19:17 -07:00
parent 17672480fb
commit f7194ac32c
4 changed files with 64 additions and 18 deletions
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7
kernel/rcu/rcutorture.c
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@@ -593,7 +593,12 @@ static void srcu_torture_init(void)
static void srcu_torture_cleanup(void)
{
cleanup_srcu_struct(&srcu_ctld);
static DEFINE_TORTURE_RANDOM(rand);
if (torture_random(&rand) & 0x800)
cleanup_srcu_struct(&srcu_ctld);
else
cleanup_srcu_struct_quiesced(&srcu_ctld);
srcu_ctlp = &srcu_ctl; /* In case of a later rcutorture run. */
}