It is enough to have three values of rcu_gp.ctr, 00 for INACTIVE, 01 or 11 for ACTIVE. So it is possible to replace add operation with xor operation when changing rcu_gp.ctr value.
Signed-off-by: yaowenbin <[email protected]> --- src/urcu-qsbr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/urcu-qsbr.c b/src/urcu-qsbr.c index 3709412..46135f9 100644 --- a/src/urcu-qsbr.c +++ b/src/urcu-qsbr.c @@ -391,7 +391,7 @@ void urcu_qsbr_synchronize_rcu(void) goto out; /* Increment current G.P. */ - CMM_STORE_SHARED(urcu_qsbr_gp.ctr, urcu_qsbr_gp.ctr + URCU_QSBR_GP_CTR); + CMM_STORE_SHARED(urcu_qsbr_gp.ctr, urcu_qsbr_gp.ctr ^ URCU_QSBR_GP_CTR); /* * Must commit urcu_qsbr_gp.ctr update to memory before waiting for -- 2.27.0 _______________________________________________ lttng-dev mailing list [email protected] https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
