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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-04-06 02:19:17 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-05-15 19:27:56 +0200 |
| commit | f7194ac32ca241d28765a98e42a7fe13debc85a7 (patch) | |
| tree | 788cdde1d2f7abe01e14b37004e89734cc642835 /kernel/rcu/srcutiny.c | |
| parent | rcu: Declare rcu_eqs_special_set() in public header (diff) | |
| download | linux-f7194ac32ca241d28765a98e42a7fe13debc85a7.tar.xz linux-f7194ac32ca241d28765a98e42a7fe13debc85a7.zip | |
srcu: Add cleanup_srcu_struct_quiesced()
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>
Diffstat (limited to 'kernel/rcu/srcutiny.c')
| -rw-r--r-- | kernel/rcu/srcutiny.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/kernel/rcu/srcutiny.c b/kernel/rcu/srcutiny.c index 76ac5f50b2c7..622792abe41a 100644 --- a/kernel/rcu/srcutiny.c +++ b/kernel/rcu/srcutiny.c @@ -86,16 +86,19 @@ EXPORT_SYMBOL_GPL(init_srcu_struct); * Must invoke this after you are finished using a given srcu_struct that * was initialized via init_srcu_struct(), else you leak memory. */ -void cleanup_srcu_struct(struct srcu_struct *sp) +void _cleanup_srcu_struct(struct srcu_struct *sp, bool quiesced) { WARN_ON(sp->srcu_lock_nesting[0] || sp->srcu_lock_nesting[1]); - flush_work(&sp->srcu_work); + if (quiesced) + WARN_ON(work_pending(&sp->srcu_work)); + else + flush_work(&sp->srcu_work); WARN_ON(sp->srcu_gp_running); WARN_ON(sp->srcu_gp_waiting); WARN_ON(sp->srcu_cb_head); WARN_ON(&sp->srcu_cb_head != sp->srcu_cb_tail); } -EXPORT_SYMBOL_GPL(cleanup_srcu_struct); +EXPORT_SYMBOL_GPL(_cleanup_srcu_struct); /* * Removes the count for the old reader from the appropriate element of |