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

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Message-ID: <2e71c2bf-9ee3-4ada-e9d9-acb6e422e9af@redhat.com>
Date:   Sat, 18 Mar 2023 17:30:46 -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 3/17/23 21:35, Waiman Long wrote:
> 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.
>
It turns out that cpuset_node_allowed() isn't used anywhere except in 
cpuset.h. So it should be OK to remove the alternate 
cpuset_node_allowed() function.

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