Re: [PATCH v6 02/10] mm/memory_hotplug: add mhp_online_type_to_str() and export string helpers

[Dave Jiang]

On 6/30/26 2:18 PM, Gregory Price wrote:
> Add mhp_online_type_to_str() as the inverse of mhp_online_type_from_str(),
> and export both so a driver can render and parse the memory online type
> through its own sysfs interface.
> 
> Signed-off-by: Gregory Price <gou...@gourry.net>
> ---
>  drivers/base/memory.c          | 9 +++++++++
>  include/linux/memory_hotplug.h | 1 +
>  2 files changed, 10 insertions(+)
> 
> diff --git a/drivers/base/memory.c b/drivers/base/memory.c
> index b318344426fa..3a2f69d3af7b 100644
> --- a/drivers/base/memory.c
> +++ b/drivers/base/memory.c
> @@ -46,6 +46,15 @@ int mhp_online_type_from_str(const char *str)
>       }
>       return -EINVAL;
>  }
> +EXPORT_SYMBOL_GPL(mhp_online_type_from_str);
> +
> +const char *mhp_online_type_to_str(int online_type)
> +{
> +     if (online_type < 0 || online_type >= 
> (int)ARRAY_SIZE(online_type_to_str))
> +             return NULL;
> +     return online_type_to_str[online_type];
> +}
> +EXPORT_SYMBOL_GPL(mhp_online_type_to_str);
>  
>  #define to_memory_block(dev) container_of(dev, struct memory_block, dev)
>  
> diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
> index 7c9d66729c60..5d4b628c4a1f 100644
> --- a/include/linux/memory_hotplug.h
> +++ b/include/linux/memory_hotplug.h
> @@ -127,6 +127,7 @@ extern int arch_add_memory(int nid, u64 start, u64 size,
>  extern u64 max_mem_size;
>  
>  extern int mhp_online_type_from_str(const char *str);
> +const char *mhp_online_type_to_str(int online_type);

Does this need to also be 'extern'?

DJ

>  
>  /* If movable_node boot option specified */
>  extern bool movable_node_enabled;