Re: [PATCH v4 3/4] RISC-V: mm: Enable huge page support to kernel_page_present() function

From: Andrew Jones
Date: Thu Feb 23 2023 - 01:57:30 EST


On Tue, Feb 21, 2023 at 10:35:22AM +0800, Sia Jee Heng wrote:
> Currently kernel_page_present() function doesn't support huge page
> detection causes the function to mistakenly return false to the
> hibernation core.
>
> Add huge page detection to the function to solve the problem.
>
> Fixes tag: commit 9e953cda5cdf ("riscv:
> Introduce huge page support for 32/64bit kernel")

This should be formatted as below (no line wrap and no 'tag' in the tag)

Fixes: 9e953cda5cdf ("riscv: Introduce huge page support for 32/64bit kernel")

>
> Signed-off-by: Sia Jee Heng <jeeheng.sia@xxxxxxxxxxxxxxxx>
> Reviewed-by: Ley Foon Tan <leyfoon.tan@xxxxxxxxxxxxxxxx>
> Reviewed-by: Mason Huo <mason.huo@xxxxxxxxxxxxxxxx>
> ---
> arch/riscv/mm/pageattr.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/arch/riscv/mm/pageattr.c b/arch/riscv/mm/pageattr.c
> index 86c56616e5de..ea3d61de065b 100644
> --- a/arch/riscv/mm/pageattr.c
> +++ b/arch/riscv/mm/pageattr.c
> @@ -217,18 +217,26 @@ bool kernel_page_present(struct page *page)
> pgd = pgd_offset_k(addr);
> if (!pgd_present(*pgd))
> return false;
> + if (pgd_leaf(*pgd))
> + return true;
>
> p4d = p4d_offset(pgd, addr);
> if (!p4d_present(*p4d))
> return false;
> + if (p4d_leaf(*p4d))
> + return true;
>
> pud = pud_offset(p4d, addr);
> if (!pud_present(*pud))
> return false;
> + if (pud_leaf(*pud))
> + return true;
>
> pmd = pmd_offset(pud, addr);
> if (!pmd_present(*pmd))
> return false;
> + if (pmd_leaf(*pmd))
> + return true;
>
> pte = pte_offset_kernel(pmd, addr);
> return pte_present(*pte);
> --
> 2.34.1
>
>

Otherwise,

Reviewed-by: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>

Thanks,
drew