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rcu: use coroutine TLS macros

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RCU may be used from coroutines. Standard __thread variables cannot be
used by coroutines. Use the coroutine TLS macros instead.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20220222140150.27240-4-stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi
2022-02-22 14:01:49 +00:00
committed by Kevin Wolf
parent 47b7446456
commit 17c78154b0
4 changed files with 16 additions and 15 deletions
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10
util/rcu.c
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@@ -65,7 +65,7 @@ static inline int rcu_gp_ongoing(unsigned long *ctr)
/* Written to only by each individual reader. Read by both the reader and the
* writers.
*/
__thread struct rcu_reader_data rcu_reader;
QEMU_DEFINE_CO_TLS(struct rcu_reader_data, rcu_reader)
/* Protected by rcu_registry_lock. */
typedef QLIST_HEAD(, rcu_reader_data) ThreadList;
@@ -355,23 +355,23 @@ void drain_call_rcu(void)
void rcu_register_thread(void)
{
assert(rcu_reader.ctr == 0);
assert(get_ptr_rcu_reader()->ctr == 0);
qemu_mutex_lock(&rcu_registry_lock);
QLIST_INSERT_HEAD(&registry, &rcu_reader, node);
QLIST_INSERT_HEAD(&registry, get_ptr_rcu_reader(), node);
qemu_mutex_unlock(&rcu_registry_lock);
}
void rcu_unregister_thread(void)
{
qemu_mutex_lock(&rcu_registry_lock);
QLIST_REMOVE(&rcu_reader, node);
QLIST_REMOVE(get_ptr_rcu_reader(), node);
qemu_mutex_unlock(&rcu_registry_lock);
}
void rcu_add_force_rcu_notifier(Notifier *n)
{
qemu_mutex_lock(&rcu_registry_lock);
notifier_list_add(&rcu_reader.force_rcu, n);
notifier_list_add(&get_ptr_rcu_reader()->force_rcu, n);
qemu_mutex_unlock(&rcu_registry_lock);
}