diff mbox series

[01/10] rcu: Use rcu_segcblist_segempty() instead of open coding it

Message ID 20230908203603.5865-2-frederic@kernel.org (mailing list archive)
State Accepted
Commit 7df2a2a024145d0dcc1e51dc378c527000b35b07
Headers show
Series rcu cleanups | expand

Commit Message

Frederic Weisbecker Sept. 8, 2023, 8:35 p.m. UTC 
This makes the code more readable.

Reviewed-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
---
 kernel/rcu/rcu_segcblist.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Paul E. McKenney Oct. 2, 2023, 3:38 p.m. UTC | #1 
On Fri, Sep 08, 2023 at 10:35:54PM +0200, Frederic Weisbecker wrote:
> This makes the code more readable.
> 
> Reviewed-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
> Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
> Signed-off-by: Frederic Weisbecker <frederic@kernel.org>

Reviewed-by: Paul E. McKenney <paulmck@kernel.org>

> ---
>  kernel/rcu/rcu_segcblist.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/rcu/rcu_segcblist.c b/kernel/rcu/rcu_segcblist.c
> index f71fac422c8f..1693ea22ef1b 100644
> --- a/kernel/rcu/rcu_segcblist.c
> +++ b/kernel/rcu/rcu_segcblist.c
> @@ -368,7 +368,7 @@ bool rcu_segcblist_entrain(struct rcu_segcblist *rsclp,
>  	smp_mb(); /* Ensure counts are updated before callback is entrained. */
>  	rhp->next = NULL;
>  	for (i = RCU_NEXT_TAIL; i > RCU_DONE_TAIL; i--)
> -		if (rsclp->tails[i] != rsclp->tails[i - 1])
> +		if (!rcu_segcblist_segempty(rsclp, i))
>  			break;
>  	rcu_segcblist_inc_seglen(rsclp, i);
>  	WRITE_ONCE(*rsclp->tails[i], rhp);
> @@ -551,7 +551,7 @@ bool rcu_segcblist_accelerate(struct rcu_segcblist *rsclp, unsigned long seq)
>  	 * as their ->gp_seq[] grace-period completion sequence number.
>  	 */
>  	for (i = RCU_NEXT_READY_TAIL; i > RCU_DONE_TAIL; i--)
> -		if (rsclp->tails[i] != rsclp->tails[i - 1] &&
> +		if (!rcu_segcblist_segempty(rsclp, i) &&
>  		    ULONG_CMP_LT(rsclp->gp_seq[i], seq))
>  			break;
>  
> -- 
> 2.41.0
>
diff mbox series

Patch

diff --git a/kernel/rcu/rcu_segcblist.c b/kernel/rcu/rcu_segcblist.c
index f71fac422c8f..1693ea22ef1b 100644
--- a/kernel/rcu/rcu_segcblist.c
+++ b/kernel/rcu/rcu_segcblist.c
@@ -368,7 +368,7 @@  bool rcu_segcblist_entrain(struct rcu_segcblist *rsclp,
 	smp_mb(); /* Ensure counts are updated before callback is entrained. */
 	rhp->next = NULL;
 	for (i = RCU_NEXT_TAIL; i > RCU_DONE_TAIL; i--)
-		if (rsclp->tails[i] != rsclp->tails[i - 1])
+		if (!rcu_segcblist_segempty(rsclp, i))
 			break;
 	rcu_segcblist_inc_seglen(rsclp, i);
 	WRITE_ONCE(*rsclp->tails[i], rhp);
@@ -551,7 +551,7 @@  bool rcu_segcblist_accelerate(struct rcu_segcblist *rsclp, unsigned long seq)
 	 * as their ->gp_seq[] grace-period completion sequence number.
 	 */
 	for (i = RCU_NEXT_READY_TAIL; i > RCU_DONE_TAIL; i--)
-		if (rsclp->tails[i] != rsclp->tails[i - 1] &&
+		if (!rcu_segcblist_segempty(rsclp, i) &&
 		    ULONG_CMP_LT(rsclp->gp_seq[i], seq))
 			break;