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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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7
include/qemu/rcu.h
View file

@ -29,6 +29,7 @@
#include "qemu/atomic.h"
#include "qemu/notify.h"
#include "qemu/sys_membarrier.h"
#include "qemu/coroutine-tls.h"
#ifdef __cplusplus
extern "C" {
@ -76,11 +77,11 @@ struct rcu_reader_data {
NotifierList force_rcu;
};
extern __thread struct rcu_reader_data rcu_reader;
QEMU_DECLARE_CO_TLS(struct rcu_reader_data, rcu_reader)
static inline void rcu_read_lock(void)
{
struct rcu_reader_data *p_rcu_reader = &rcu_reader;
struct rcu_reader_data *p_rcu_reader = get_ptr_rcu_reader();
unsigned ctr;
if (p_rcu_reader->depth++ > 0) {
@ -96,7 +97,7 @@ static inline void rcu_read_lock(void)
static inline void rcu_read_unlock(void)
{
struct rcu_reader_data *p_rcu_reader = &rcu_reader;
struct rcu_reader_data *p_rcu_reader = get_ptr_rcu_reader();
assert(p_rcu_reader->depth != 0);
if (--p_rcu_reader->depth > 0) {