linux-kernel - Re: [PATCH 2/2] drivers/base/node: merge unregister_one_node() and unregister

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Message-ID: <ec2a78ce-2f2d-4453-b1dd-8c8ddc0e29d0@linux.ibm.com>
Date: Thu, 25 Sep 2025 10:33:22 +0530
From: Donet Tom <donettom@...ux.ibm.com>
To: Christophe Leroy <christophe.leroy@...roup.eu>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Oscar Salvador <osalvador@...e.de>
Cc: Ritesh Harjani <ritesh.list@...il.com>,
        Aboorva Devarajan <aboorvad@...ux.ibm.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org, Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Danilo Krummrich <dakr@...nel.org>, Mike Rapoport <rppt@...nel.org>,
        Dave Jiang <dave.jiang@...el.com>
Subject: Re: [PATCH 2/2] drivers/base/node: merge unregister_one_node() and
 unregister_node() to a single function.


On 9/25/25 12:49 AM, Christophe Leroy wrote:
>
>
> Le 24/09/2025 à 20:40, Donet Tom a écrit :
>> unregister_one_node() and unregister_node() are small functions.
>> This patch merges them into a single function named unregister_node()
>> to improve code readability.
>
> Same comment than patch 1. It is not only because they are small that 
> you merge them, it is primarily because unregister_node() only has one 
> caller.


Will update it in the next version.


>
>>
>> No functional changes are introduced.
>>
>> Signed-off-by: Donet Tom <donettom@...ux.ibm.com>
>> ---
>>   drivers/base/node.c  | 37 +++++++++++++++++--------------------
>>   include/linux/node.h |  6 ++----
>>   mm/memory_hotplug.c  |  4 ++--
>>   3 files changed, 21 insertions(+), 26 deletions(-)
>>
>> diff --git a/drivers/base/node.c b/drivers/base/node.c
>> index eab620e29c78..d460c1675c77 100644
>> --- a/drivers/base/node.c
>> +++ b/drivers/base/node.c
>> @@ -638,23 +638,6 @@ static void node_device_release(struct device *dev)
>>       kfree(to_node(dev));
>>   }
>>   -/**
>> - * unregister_node - unregister a node device
>> - * @node: node going away
>> - *
>> - * Unregisters a node device @node.  All the devices on the node 
>> must be
>> - * unregistered before calling this function.
>> - */
>> -void unregister_node(struct node *node)
>> -{
>> -    hugetlb_unregister_node(node);
>> -    compaction_unregister_node(node);
>> -    reclaim_unregister_node(node);
>> -    node_remove_accesses(node);
>> -    node_remove_caches(node);
>> -    device_unregister(&node->dev);
>> -}
>> -
>>   struct node *node_devices[MAX_NUMNODES];
>>     /*
>> @@ -887,12 +870,26 @@ int register_node(int nid)
>>       return error;
>>   }
>>   -void unregister_one_node(int nid)
>> +/**
>> + * unregister_node - unregister a node device
>> + * @nid: nid of the node going away
>> + *
>> + * Unregisters the node device at node id  @nid.  All the devices on 
>> the
>> + * node must be unregistered before calling this function.
>> + */
>> +void unregister_node(int nid)
>>   {
>> -    if (!node_devices[nid])
>> +    struct node *node = node_devices[nid];
>> +
>> +    if (!node)
>>           return;
>>   -    unregister_node(node_devices[nid]);
>> +    hugetlb_unregister_node(node);
>> +    compaction_unregister_node(node);
>> +    reclaim_unregister_node(node);
>> +    node_remove_accesses(node);
>> +    node_remove_caches(node);
>> +    device_unregister(&node->dev);
>>       node_devices[nid] = NULL;
>>   }
>>   diff --git a/include/linux/node.h b/include/linux/node.h
>> index 4dcf876cd0b4..d721127964b3 100644
>> --- a/include/linux/node.h
>> +++ b/include/linux/node.h
>> @@ -124,8 +124,6 @@ static inline void 
>> register_memory_blocks_under_nodes(void)
>>   }
>>   #endif
>>   -extern void unregister_node(struct node *node);
>> -
>>   struct node_notify {
>>       int nid;
>>   };
>> @@ -169,7 +167,7 @@ static inline int 
>> hotplug_node_notifier(notifier_fn_t fn, int pri)
>>   extern void node_dev_init(void);
>>   /* Core of the node registration - only memory hotplug should use 
>> this */
>>   extern int register_node(int nid);
>> -extern void unregister_one_node(int nid);
>> +extern void unregister_node(int nid);
>
> No 'extern' on function prototypes.


Sure.

Thank you very much


>
>>   extern int register_cpu_under_node(unsigned int cpu, unsigned int 
>> nid);
>>   extern int unregister_cpu_under_node(unsigned int cpu, unsigned int 
>> nid);
>>   extern void unregister_memory_block_under_nodes(struct memory_block 
>> *mem_blk);
>> @@ -185,7 +183,7 @@ static inline int register_node(int nid)
>>   {
>>       return 0;
>>   }
>> -static inline int unregister_one_node(int nid)
>> +static inline int unregister_node(int nid)
>>   {
>>       return 0;
>>   }
>> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
>> index 6c050d867031..94a8f6e8811a 100644
>> --- a/mm/memory_hotplug.c
>> +++ b/mm/memory_hotplug.c
>> @@ -1596,7 +1596,7 @@ int add_memory_resource(int nid, struct 
>> resource *res, mhp_t mhp_flags)
>>   error:
>>       if (new_node) {
>>           node_set_offline(nid);
>> -        unregister_one_node(nid);
>> +        unregister_node(nid);
>>       }
>>   error_memblock_remove:
>>       if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK))
>> @@ -2201,7 +2201,7 @@ void try_offline_node(int nid)
>>        * node now.
>>        */
>>       node_set_offline(nid);
>> -    unregister_one_node(nid);
>> +    unregister_node(nid);
>>   }
>>   EXPORT_SYMBOL(try_offline_node);
>
>