linux-kernel - Re: [PATCH] cpuset: Clean up cpuset_node

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Date:   Fri, 17 Mar 2023 21:35:39 -0400
From:   Waiman Long <longman@...hat.com>
To:     Haifeng Xu <haifeng.xu@...pee.com>
Cc:     lizefan.x@...edance.com, tj@...nel.org, hannes@...xchg.org,
        akpm@...ux-foundation.org, cgroups@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpuset: Clean up cpuset_node_allowed

On 2/28/23 03:35, Haifeng Xu wrote:
> Commit 002f290627c2 ("cpuset: use static key better and convert to new API")
> has used __cpuset_node_allowed() instead of cpuset_node_allowed() to check
> whether we can allocate on a memory node. Now this function isn't used by
> anyone, so we can do the follow things to clean up it.
>
> 1. remove unused codes
> 2. rename __cpuset_node_allowed() to cpuset_node_allowed()
> 3. update comments in mm/page_alloc.c
>
> Suggested-by: Waiman Long <longman@...hat.com>
> Signed-off-by: Haifeng Xu <haifeng.xu@...pee.com>
> ---
>   include/linux/cpuset.h | 16 ++--------------
>   kernel/cgroup/cpuset.c |  4 ++--
>   mm/page_alloc.c        |  4 ++--
>   3 files changed, 6 insertions(+), 18 deletions(-)
>
> diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h
> index d58e0476ee8e..980b76a1237e 100644
> --- a/include/linux/cpuset.h
> +++ b/include/linux/cpuset.h
> @@ -80,18 +80,11 @@ extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
>   void cpuset_init_current_mems_allowed(void);
>   int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask);
>   
> -extern bool __cpuset_node_allowed(int node, gfp_t gfp_mask);
> -
> -static inline bool cpuset_node_allowed(int node, gfp_t gfp_mask)
> -{
> -	if (cpusets_enabled())
> -		return __cpuset_node_allowed(node, gfp_mask);
> -	return true;
> -}
> +extern bool cpuset_node_allowed(int node, gfp_t gfp_mask);
>   
>   static inline bool __cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)
>   {
> -	return __cpuset_node_allowed(zone_to_nid(z), gfp_mask);
> +	return cpuset_node_allowed(zone_to_nid(z), gfp_mask);
>   }
>   
>   static inline bool cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)
> @@ -223,11 +216,6 @@ static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
>   	return 1;
>   }
>   
> -static inline bool cpuset_node_allowed(int node, gfp_t gfp_mask)
> -{
> -	return true;
> -}
> -

Sorry for the late reply as I apparently drop the ball.

You need to keep the above cpuset_node_allowed() inline function or you 
will get compilation error when compiling with a config without 
CONFIG_CPUSETS. Other than that, the other changes look good.

Cheers,
Longman