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From:   Greentime Hu <greentime.hu@sifive.com>
Date:   Sat, 12 Sep 2020 10:10:09 +0800
Message-ID: <CAHCEehJqV1aBQjWCB1b=r+aQmkMmQnx1ynYzHgCW92NNntZrfg@mail.gmail.com>
Subject: Re: [RFC/RFT PATCH v2 3/5] riscv: Separate memory init from paging init
To:     Atish Patra <atish.patra@wdc.com>
Cc:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Andrew Morton <akpm@linux-foundation.org>,
        Anshuman Khandual <anshuman.khandual@arm.com>,
        Anup Patel <anup@brainfault.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Catalin Marinas <catalin.marinas@arm.com>,
        David Hildenbrand <david@redhat.com>,
        Bjorn Helgaas <helgaas@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jia He <justin.he@arm.com>, linux-arch@vger.kernel.org,
        linux-riscv <linux-riscv@lists.infradead.org>,
        Mike Rapoport <rppt@kernel.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Steven Price <steven.price@arm.com>,
        Will Deacon <will@kernel.org>, Zong Li <zong.li@sifive.com>,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>
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Atish Patra <atish.patra@wdc.com> =E6=96=BC 2020=E5=B9=B49=E6=9C=8812=E6=97=
=A5 =E9=80=B1=E5=85=AD =E4=B8=8A=E5=8D=889:34=E5=AF=AB=E9=81=93=EF=BC=9A
>
> 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@wdc.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/pg=
table.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 *pa=
ge, 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 188281fc2816..8f31a5428ce4 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -568,8 +568,12 @@ 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();
>  }

Thank you, Atish.
Reviewed-by: Greentime Hu <greentime.hu@sifive.com>