linux-kernel - Re: [PATCH v4 3/5] riscv: Separate memory init from paging init

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Date:   Thu, 05 Nov 2020 09:34:00 -0800 (PST)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     Atish Patra <Atish.Patra@....com>
CC:     linux-kernel@...r.kernel.org, Atish Patra <Atish.Patra@....com>,
        greentime.hu@...ive.com, aou@...s.berkeley.edu,
        akpm@...ux-foundation.org, anshuman.khandual@....com,
        anup@...infault.org, Arnd Bergmann <arnd@...db.de>,
        catalin.marinas@....com, david@...hat.com,
        Greg KH <gregkh@...uxfoundation.org>, justin.he@....com,
        Jonathan.Cameron@...wei.com, wangkefeng.wang@...wei.com,
        linux-arch@...r.kernel.org, linux-riscv@...ts.infradead.org,
        rppt@...nel.org, nsaenzjulienne@...e.de,
        Paul Walmsley <paul.walmsley@...ive.com>, rafael@...nel.org,
        steven.price@....com, will@...nel.org, zong.li@...ive.com,
        linux-arm-kernel@...ts.infradead.org
Subject:     Re: [PATCH v4 3/5] riscv: Separate memory init from paging init

On Mon, 05 Oct 2020 17:17:50 PDT (-0700), Atish Patra wrote:
> Currently, we perform some memory init functions in paging init. But,
> that will be an issue for NUMA support where DT needs to be flattened
> before numa initialization and memblock_present can only be called
> after numa initialization.
>
> Move memory initialization related functions to a separate function.
>
> Signed-off-by: Atish Patra <atish.patra@....com>
> Reviewed-by: Greentime Hu <greentime.hu@...ive.com>
> ---
>  arch/riscv/include/asm/pgtable.h | 1 +
>  arch/riscv/kernel/setup.c        | 1 +
>  arch/riscv/mm/init.c             | 6 +++++-
>  3 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
> index eaea1f717010..515b42f98d34 100644
> --- a/arch/riscv/include/asm/pgtable.h
> +++ b/arch/riscv/include/asm/pgtable.h
> @@ -466,6 +466,7 @@ static inline void __kernel_map_pages(struct page *page, int numpages, int enabl
>  extern void *dtb_early_va;
>  void setup_bootmem(void);
>  void paging_init(void);
> +void misc_mem_init(void);
>
>  #define FIRST_USER_ADDRESS  0
>
> diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> index 2c6dd329312b..07fa6d13367e 100644
> --- a/arch/riscv/kernel/setup.c
> +++ b/arch/riscv/kernel/setup.c
> @@ -78,6 +78,7 @@ void __init setup_arch(char **cmdline_p)
>  #else
>  	unflatten_device_tree();
>  #endif
> +	misc_mem_init();
>
>  #ifdef CONFIG_SWIOTLB
>  	swiotlb_init(1);
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index ed6e83871112..114c3966aadb 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -565,8 +565,12 @@ static void __init resource_init(void)
>  void __init paging_init(void)
>  {
>  	setup_vm_final();
> -	sparse_init();
>  	setup_zero_page();
> +}
> +
> +void __init misc_mem_init(void)
> +{
> +	sparse_init();
>  	zone_sizes_init();
>  	resource_init();
>  }

Reviewed-by: Palmer Dabbelt <palmerdabbelt@...gle.com>