[RFC/RFT PATCH v2 3/5] riscv: Separate memory init from paging init

[Greentime Hu]

Atish Patra <atish.patra at wdc.com> 於 2020年9月12日 週六 上午9:34寫道：
>
> 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 at 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/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 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 at sifive.com>