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Re: [PATCH v4 09/12] xen/spinlock: add missing rspin_is_locked() and rspin_barrier()
- To: Juergen Gross <jgross@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 29 Feb 2024 15:14:26 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Paul Durrant <paul@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 29 Feb 2024 14:14:35 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 12.12.2023 10:47, Juergen Gross wrote:
> --- a/xen/common/spinlock.c
> +++ b/xen/common/spinlock.c
> @@ -458,6 +458,23 @@ void _spin_barrier(spinlock_t *lock)
> spin_barrier_common(&lock->tickets, &lock->debug, LOCK_PROFILE_PAR);
> }
>
> +int rspin_is_locked(const rspinlock_t *lock)
> +{
> + /*
> + * Recursive locks may be locked by another CPU, yet we return
> + * "false" here, making this function suitable only for use in
> + * ASSERT()s and alike.
> + */
> + return lock->recurse_cpu == SPINLOCK_NO_CPU
> + ? spin_is_locked_common(&lock->tickets)
> + : lock->recurse_cpu == smp_processor_id();
> +}
> +
> +void rspin_barrier(rspinlock_t *lock)
> +{
> + spin_barrier_common(&lock->tickets, &lock->debug, LOCK_PROFILE_PAR);
> +}
Ah, here we go. Looks all okay to me, but needs re-ordering such that the
earlier patch won't transiently introduce a regression.
Jan
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