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

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Date:   Thu, 22 Oct 2020 11:07:57 +0530
From:   Anup Patel <anup@...infault.org>
To:     Atish Patra <atish.patra@....com>
Cc:     "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        Greentime Hu <greentime.hu@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        David Hildenbrand <david@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jia He <justin.he@....com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        linux-arch@...r.kernel.org,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Mike Rapoport <rppt@...nel.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Steven Price <steven.price@....com>,
        Will Deacon <will@...nel.org>, Zong Li <zong.li@...ive.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 3/5] riscv: Separate memory init from paging init

On Tue, Oct 6, 2020 at 5:48 AM Atish Patra <atish.patra@....com> 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();
>  }
> --
> 2.25.1
>

Looks good to me.

Reviewed-by: Anup Patel <anup@...infault.org>

Regards,
Anup