linux-kernel - Re: [PATCH] cpuset: Remove unused cpuset_node

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Date:   Tue, 28 Feb 2023 10:40:36 +0800
From:   Haifeng Xu <haifeng.xu@...pee.com>
To:     Waiman Long <longman@...hat.com>
Cc:     lizefan.x@...edance.com, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpuset: Remove unused cpuset_node_allowed



On 2023/2/27 22:56, Waiman Long wrote:
> On 2/27/23 03:07, 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 remove it safely.
>>
>> Signed-off-by: Haifeng Xu <haifeng.xu@...pee.com>
>> ---
>>   include/linux/cpuset.h | 12 ------------
>>   1 file changed, 12 deletions(-)
>>
>> diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h
>> index d58e0476ee8e..7fad5afe3bba 100644
>> --- a/include/linux/cpuset.h
>> +++ b/include/linux/cpuset.h
>> @@ -82,13 +82,6 @@ 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;
>> -}
>> -
>>   static inline bool __cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)
>>   {
>>       return __cpuset_node_allowed(zone_to_nid(z), 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;
>> -}
>> -
>>   static inline bool __cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)
>>   {
>>       return true;
> 
> The kernel convention is to add a "__" prefix to a function name if there is higher level helper without the "__" prefix that uses it. Since cpuset_node_allowed() is no longer used. We should just rename __cpuset_node_allowed() to cpuset_node_allowed() and get rid of the unused helper. A bit more code changes are needed for this, though.
> 
> Cheers,
> Longman
> 

Maybe we can still use cpuset_node_allowed in __cpuset_zone_allowed? If so, less code need to be changed.

Thanks.