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

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Date:   Mon, 27 Feb 2023 21:52:40 -0500
From:   Waiman Long <longman@...hat.com>
To:     Haifeng Xu <haifeng.xu@...pee.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 2/27/23 21:40, Haifeng Xu wrote:
>
> 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.
>
mm/page_alloc.c has 2 references to __cpuset_node_allowed() in their 
comments. These references should also be updated as well. That is why I 
said a bit more code needs to be touched.

Cheers,
Longman