[PATCH 4/8] memblock: introduce memblock_add_phys() and memblock_is_physmem()

[Matt Fleming]

(Moar reviewers)

On Mon, 22 Dec, at 07:08:38PM, Ard Biesheuvel wrote:
> This introduces the following functions:
> - memblock_add_phys(), that registers regions in the 'physmem' memblock map if
>   CONFIG_HAVE_MEMBLOCK_PHYS_MAP is set; otherwise, it is a nop
> - memblock_is_physmem(), returns whether a physical address is classified as
>   physical memory.
> 
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>
> ---
>  include/linux/memblock.h | 10 ++++++++++
>  mm/memblock.c            | 15 +++++++++++++++
>  2 files changed, 25 insertions(+)
> 
> diff --git a/include/linux/memblock.h b/include/linux/memblock.h
> index e8cc45307f8f..d32fe838c6ca 100644
> --- a/include/linux/memblock.h
> +++ b/include/linux/memblock.h
> @@ -365,6 +365,16 @@ static inline unsigned long memblock_region_reserved_end_pfn(const struct memblo
>  #define __initdata_memblock
>  #endif
>  
> +#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
> +int memblock_add_phys(phys_addr_t base, phys_addr_t size);
> +int memblock_is_physmem(phys_addr_t addr);
> +#else
> +static inline int memblock_add_phys(phys_addr_t base, phys_addr_t size)
> +{
> +	return 0;
> +}
> +#endif /* CONFIG_HAVE_MEMBLOCK_PHYS_MAP */
> +
>  #else
>  static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
>  {
> diff --git a/mm/memblock.c b/mm/memblock.c
> index c27353beb260..107aa5ee2d7b 100644
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -586,6 +586,14 @@ int __init_memblock memblock_add(phys_addr_t base, phys_addr_t size)
>  				   MAX_NUMNODES, 0);
>  }
>  
> +#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
> +int __init_memblock memblock_add_phys(phys_addr_t base, phys_addr_t size)
> +{
> +	return memblock_add_range(&memblock.physmem, base, size,
> +				  MAX_NUMNODES, 0);
> +}
> +#endif
> +
>  /**
>   * memblock_isolate_range - isolate given range into disjoint memblocks
>   * @type: memblock type to isolate range for
> @@ -1398,6 +1406,13 @@ int __init_memblock memblock_is_memory(phys_addr_t addr)
>  	return memblock_search(&memblock.memory, addr) != -1;
>  }
>  
> +#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
> +int __init_memblock memblock_is_physmem(phys_addr_t addr)
> +{
> +	return memblock_search(&memblock.physmem, addr) != -1;
> +}
> +#endif
> +
>  #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
>  int __init_memblock memblock_search_pfn_nid(unsigned long pfn,
>  			 unsigned long *start_pfn, unsigned long *end_pfn)
> -- 
> 1.8.3.2
> 
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-- 
Matt Fleming, Intel Open Source Technology Center