[PATCH] arm64: Use correct method to calculate nomap region boundaries

[Huacai Chen]

Ping?

On Fri, Oct 22, 2021 at 3:07 PM Huacai Chen <chenhuacai at loongson.cn> wrote:
>
> Nomap regions are treated as "reserved". When region boundaries are not
> page aligned, we usually increase the "reserved" regions rather than
> decrease them. So, we should use memblock_region_reserved_base_pfn()/
> memblock_region_reserved_end_pfn() instead of memblock_region_memory_
> base_pfn()/memblock_region_memory_base_pfn() to calculate boundaries.
>
> Signed-off-by: Huacai Chen <chenhuacai at loongson.cn>
> ---
>  arch/arm64/kernel/setup.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
> index be5f85b0a24d..1e86d4c5ef8c 100644
> --- a/arch/arm64/kernel/setup.c
> +++ b/arch/arm64/kernel/setup.c
> @@ -232,12 +232,14 @@ static void __init request_standard_resources(void)
>                 if (memblock_is_nomap(region)) {
>                         res->name  = "reserved";
>                         res->flags = IORESOURCE_MEM;
> +                       res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
> +                       res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
>                 } else {
>                         res->name  = "System RAM";
>                         res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
> +                       res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
> +                       res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
>                 }
> -               res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
> -               res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
>
>                 request_resource(&iomem_resource, res);
>
> --
> 2.27.0
>