[PATCH next] riscv: Add support for memtest

[Palmer Dabbelt]

On Wed, 24 Feb 2021 22:54:17 PST (-0800), wangkefeng.wang at huawei.com wrote:
> The riscv [rv32_]defconfig enabled CONFIG_MEMTEST,
> but memtest feature is not supported in RISCV.
>
> Add early_memtest() to support for memtest.
>
> Signed-off-by: Kefeng Wang <wangkefeng.wang at huawei.com>
> ---
>  Documentation/admin-guide/kernel-parameters.txt | 2 +-
>  arch/riscv/mm/init.c                            | 6 ++++--
>  2 files changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 04545725f187..20447b531630 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -2794,7 +2794,7 @@
>  			seconds.  Use this parameter to check at some
>  			other rate.  0 disables periodic checking.
>
> -	memtest=	[KNL,X86,ARM,PPC] Enable memtest
> +	memtest=	[KNL,X86,ARM,PPC,RISCV] Enable memtest
>  			Format: <integer>
>  			default : 0 <disable>
>  			Specifies the number of memtest passes to be
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index 067583ab1bd7..7f5036fbee8c 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -128,8 +128,9 @@ void __init setup_bootmem(void)
>  	if (max_mapped_addr == (dram_end - 1))
>  		memblock_set_current_limit(max_mapped_addr - 4096);
>
> -	max_pfn = PFN_DOWN(dram_end);
> -	max_low_pfn = max_pfn;
> +	min_low_pfn = PFN_UP(memblock_start_of_DRAM());
> +	max_low_pfn = max_pfn = PFN_DOWN(dram_end);
> +
>  	dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
>  	set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
>
> @@ -593,6 +594,7 @@ void __init paging_init(void)
>
>  void __init misc_mem_init(void)
>  {
> +	early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
>  	arch_numa_init();
>  	sparse_init();
>  	zone_sizes_init();

Thanks, this is on for-next.