Re: [PATCH V3 2/3] arm64/mm: Define arch_get_mappable_range()

[David Hildenbrand]

On 18.01.21 14:13, Anshuman Khandual wrote:
> This overrides arch_get_mappable_range() on arm64 platform which will be
> used with recently added generic framework. It drops inside_linear_region()
> and subsequent check in arch_add_memory() which are no longer required. It
> also adds a VM_BUG_ON() check that would ensure that memhp_range_allowed()
> has already been called.
> 
> Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
> Cc: Will Deacon <will@xxxxxxxxxx>
> Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
> Cc: David Hildenbrand <david@xxxxxxxxxx>
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
> ---
>  arch/arm64/mm/mmu.c | 15 +++++++--------
>  1 file changed, 7 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
> index ae0c3d023824..f2e1770c9f29 100644
> --- a/arch/arm64/mm/mmu.c
> +++ b/arch/arm64/mm/mmu.c
> @@ -1442,16 +1442,19 @@ static void __remove_pgd_mapping(pgd_t *pgdir, unsigned long start, u64 size)
>  	free_empty_tables(start, end, PAGE_OFFSET, PAGE_END);
>  }
>  
> -static bool inside_linear_region(u64 start, u64 size)
> +struct range arch_get_mappable_range(void)
>  {
> +	struct range memhp_range;
> +
>  	/*
>  	 * Linear mapping region is the range [PAGE_OFFSET..(PAGE_END - 1)]
>  	 * accommodating both its ends but excluding PAGE_END. Max physical
>  	 * range which can be mapped inside this linear mapping range, must
>  	 * also be derived from its end points.
>  	 */
> -	return start >= __pa(_PAGE_OFFSET(vabits_actual)) &&
> -	       (start + size - 1) <= __pa(PAGE_END - 1);
> +	memhp_range.start = __pa(_PAGE_OFFSET(vabits_actual));
> +	memhp_range.end =  __pa(PAGE_END - 1);
> +	return memhp_range;
>  }
>  
>  int arch_add_memory(int nid, u64 start, u64 size,
> @@ -1459,11 +1462,7 @@ int arch_add_memory(int nid, u64 start, u64 size,
>  {
>  	int ret, flags = 0;
>  
> -	if (!inside_linear_region(start, size)) {
> -		pr_err("[%llx %llx] is outside linear mapping region\n", start, start + size);
> -		return -EINVAL;
> -	}
> -
> +	VM_BUG_ON(!memhp_range_allowed(start, size, true));
>  	if (rodata_full || debug_pagealloc_enabled())
>  		flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS;
>  
> 

Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>

-- 
Thanks,

David / dhildenb