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SubjectRe: [PATCH v3 3/4] RISC-V: mm: Enable huge page support to kernel_page_present() function
+CC Alex

On Fri, Jan 27, 2023 at 05:10:50PM +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.

This sounds like a bug & should have a fixes tag, no? I assume for
whatever commit enabled huge page support...
We don't support set_memory, which by the looks of things is the other
usecase for this function, so probably doesn't need backporting.

Alex, does this change look good to you?

> Add huge page detection to the function to solve the problem.
>
> Signed-off-by: Sia Jee Heng <jeeheng.sia@starfivetech.com>
> Reviewed-by: Ley Foon Tan <leyfoon.tan@starfivetech.com>
> Reviewed-by: Mason Huo <mason.huo@starfivetech.com>
> ---
> arch/riscv/mm/pageattr.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/arch/riscv/mm/pageattr.c b/arch/riscv/mm/pageattr.c
> index 86c56616e5de..792b8d10cdfc 100644
> --- a/arch/riscv/mm/pageattr.c
> +++ b/arch/riscv/mm/pageattr.c
> @@ -221,14 +221,20 @@ bool kernel_page_present(struct page *page)
> 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
>
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