[RFC PATCH 3/8] mm: memblock: Add a means to add to memblock.reserved

[Yuquan Wang]

On Wed, May 29, 2024 at 06:12:31PM +0100, Jonathan Cameron wrote:
> For CXL CFMWS regions, need to add memblocks that may not be
> in the system memory map so that their nid can be queried later.
> Add a function to make this easy to do.
> 
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron at huawei.com>
> ---
>  include/linux/memblock.h |  2 ++
>  mm/memblock.c            | 11 +++++++++++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/include/linux/memblock.h b/include/linux/memblock.h
> index c7d518a54359..9ac1ed8c3293 100644
> --- a/include/linux/memblock.h
> +++ b/include/linux/memblock.h
> @@ -113,6 +113,8 @@ static inline void memblock_discard(void) {}
>  void memblock_allow_resize(void);
>  int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid,
>  		      enum memblock_flags flags);
> +int memblock_add_reserved_node(phys_addr_t base, phys_addr_t size, int nid,
> +		      enum memblock_flags flags);
>  int memblock_add(phys_addr_t base, phys_addr_t size);
>  int memblock_remove(phys_addr_t base, phys_addr_t size);
>  int memblock_phys_free(phys_addr_t base, phys_addr_t size);
> diff --git a/mm/memblock.c b/mm/memblock.c
> index 5498d5ea70b4..8d02f75ec186 100644
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -714,6 +714,17 @@ int __init_memblock memblock_add_node(phys_addr_t base, phys_addr_t size,
>  	return memblock_add_range(&memblock.memory, base, size, nid, flags);
>  }
>  
> +int __init_memblock memblock_add_reserved_node(phys_addr_t base, phys_addr_t size,
> +				      int nid, enum memblock_flags flags)
> +{
> +	phys_addr_t end = base + size - 1;
> +
> +	memblock_dbg("%s: [%pa-%pa] nid=%d flags=%x %pS\n", __func__,
> +		     &base, &end, nid, flags, (void *)_RET_IP_);
> +
> +	return memblock_add_range(&memblock.reserved, base, size, nid, flags);
> +}
> +
>  /**
>   * memblock_add - add new memblock region
>   * @base: base address of the new region
> -- 
> 2.39.2
>

Tested-off-by: Yuquan Wang <wangyuquan1236 at phytium.com.cn>