linux-kernel - Re: [PATCH next 1/5] locking/osq_lock: Move the definition of optimistic_spin_node into osf

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Date: Fri, 29 Dec 2023 20:59:36 -0500
From: Waiman Long <longman@...hat.com>
To: David Laight <David.Laight@...LAB.COM>,
 "'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
 "'peterz@...radead.org'" <peterz@...radead.org>
Cc: "'mingo@...hat.com'" <mingo@...hat.com>,
 "'will@...nel.org'" <will@...nel.org>,
 "'boqun.feng@...il.com'" <boqun.feng@...il.com>,
 'Linus Torvalds' <torvalds@...ux-foundation.org>,
 "'xinhui.pan@...ux.vnet.ibm.com'" <xinhui.pan@...ux.vnet.ibm.com>,
 "'virtualization@...ts.linux-foundation.org'"
 <virtualization@...ts.linux-foundation.org>,
 'Zeng Heng' <zengheng4@...wei.com>
Subject: Re: [PATCH next 1/5] locking/osq_lock: Move the definition of
 optimistic_spin_node into osf_lock.c

On 12/29/23 15:53, David Laight wrote:
> struct optimistic_spin_node is private to the implementation.
> Move it into the C file to ensure nothing is accessing it.
>
> Signed-off-by: David Laight <david.laight@...lab.com>
> ---
>   include/linux/osq_lock.h  | 5 -----
>   kernel/locking/osq_lock.c | 7 +++++++
>   2 files changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/include/linux/osq_lock.h b/include/linux/osq_lock.h
> index 5581dbd3bd34..ea8fb31379e3 100644
> --- a/include/linux/osq_lock.h
> +++ b/include/linux/osq_lock.h
> @@ -6,11 +6,6 @@
>    * An MCS like lock especially tailored for optimistic spinning for sleeping
>    * lock implementations (mutex, rwsem, etc).
>    */
> -struct optimistic_spin_node {
> -	struct optimistic_spin_node *next, *prev;
> -	int locked; /* 1 if lock acquired */
> -	int cpu; /* encoded CPU # + 1 value */
> -};
>   
>   struct optimistic_spin_queue {
>   	/*
> diff --git a/kernel/locking/osq_lock.c b/kernel/locking/osq_lock.c
> index d5610ad52b92..d414eef4bec6 100644
> --- a/kernel/locking/osq_lock.c
> +++ b/kernel/locking/osq_lock.c
> @@ -11,6 +11,13 @@
>    * called from interrupt context and we have preemption disabled while
>    * spinning.
>    */
> +
> +struct optimistic_spin_node {
> +	struct optimistic_spin_node *next, *prev;
> +	int locked; /* 1 if lock acquired */
> +	int cpu; /* encoded CPU # + 1 value */
> +};
> +
>   static DEFINE_PER_CPU_SHARED_ALIGNED(struct optimistic_spin_node, osq_node);
>   
>   /*

Please correct the patch title "osf_lock.c" => "osq_lock.c".

After the fix, you can add

Acked-by: Waiman Long <longman@...hat.com>