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

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Date:   Tue, 28 Feb 2023 11:13:33 +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 2023/2/28 10:52, Waiman Long wrote:
> 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
> 

Ok. I mean maybe we could keep cpuset_node_allowed() and use it in __cpuset_zone_allowed(). So we don't need rename __cpuset_node_allowed() or update releated comments.

Thanks.