linux-kernel - Re: [PATCH v2 3/8] riscv: mm: Refactor create_linear_mapping

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Date: Tue, 14 May 2024 19:24:08 +0200
From: Alexandre Ghiti <alexghiti@...osinc.com>
To: Björn Töpel <bjorn@...nel.org>
Cc: Albert Ou <aou@...s.berkeley.edu>, David Hildenbrand <david@...hat.com>, 
	Palmer Dabbelt <palmer@...belt.com>, Paul Walmsley <paul.walmsley@...ive.com>, 
	linux-riscv@...ts.infradead.org, Björn Töpel <bjorn@...osinc.com>, 
	Andrew Bresticker <abrestic@...osinc.com>, 
	Chethan Seshadri <Chethan.Seshadri@...alinasystems.io>, Lorenzo Stoakes <lstoakes@...il.com>, 
	Oscar Salvador <osalvador@...e.de>, Santosh Mamila <santosh.mamila@...alinasystems.io>, 
	Sivakumar Munnangi <siva.munnangi@...alinasystems.io>, Sunil V L <sunilvl@...tanamicro.com>, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 3/8] riscv: mm: Refactor create_linear_mapping_range()
 for memory hot add

On Tue, May 14, 2024 at 4:05 PM Björn Töpel <bjorn@...nelorg> wrote:
>
> From: Björn Töpel <bjorn@...osinc.com>
>
> Add a parameter to the direct map setup function, so it can be used in
> arch_add_memory() later.
>
> Signed-off-by: Björn Töpel <bjorn@...osinc.com>
> ---
>  arch/riscv/mm/init.c | 15 ++++++---------
>  1 file changed, 6 insertions(+), 9 deletions(-)
>
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index c969427eab88..6f72b0b2b854 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -1227,7 +1227,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
>  }
>
>  static void __meminit create_linear_mapping_range(phys_addr_t start, phys_addr_t end,
> -                                                 uintptr_t fixed_map_size)
> +                                                 uintptr_t fixed_map_size, const pgprot_t *pgprot)
>  {
>         phys_addr_t pa;
>         uintptr_t va, map_size;
> @@ -1238,7 +1238,7 @@ static void __meminit create_linear_mapping_range(phys_addr_t start, phys_addr_t
>                                             best_map_size(pa, va, end - pa);
>
>                 create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
> -                                  pgprot_from_va(va));
> +                                  pgprot ? *pgprot : pgprot_from_va(va));
>         }
>  }
>
> @@ -1282,22 +1282,19 @@ static void __init create_linear_mapping_page_table(void)
>                 if (end >= __pa(PAGE_OFFSET) + memory_limit)
>                         end = __pa(PAGE_OFFSET) + memory_limit;
>
> -               create_linear_mapping_range(start, end, 0);
> +               create_linear_mapping_range(start, end, 0, NULL);
>         }
>
>  #ifdef CONFIG_STRICT_KERNEL_RWX
> -       create_linear_mapping_range(ktext_start, ktext_start + ktext_size, 0);
> -       create_linear_mapping_range(krodata_start,
> -                                   krodata_start + krodata_size, 0);
> +       create_linear_mapping_range(ktext_start, ktext_start + ktext_size, 0, NULL);
> +       create_linear_mapping_range(krodata_start, krodata_start + krodata_size, 0, NULL);
>
>         memblock_clear_nomap(ktext_start,  ktext_size);
>         memblock_clear_nomap(krodata_start, krodata_size);
>  #endif
>
>  #ifdef CONFIG_KFENCE
> -       create_linear_mapping_range(kfence_pool,
> -                                   kfence_pool + KFENCE_POOL_SIZE,
> -                                   PAGE_SIZE);
> +       create_linear_mapping_range(kfence_pool, kfence_pool + KFENCE_POOL_SIZE, PAGE_SIZE, NULL);
>
>         memblock_clear_nomap(kfence_pool, KFENCE_POOL_SIZE);
>  #endif
> --
> 2.40.1
>

You can add:

Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>

Thanks,

Alex