linux-kernel - Re: [PATCH v4 3/4] RISC-V: mm: Enable huge page support to kernel_page

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Date:   Thu, 23 Feb 2023 07:57:17 +0100
From:   Andrew Jones <ajones@...tanamicro.com>
To:     Sia Jee Heng <jeeheng.sia@...rfivetech.com>
Cc:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, leyfoon.tan@...rfivetech.com,
        mason.huo@...rfivetech.com
Subject: Re: [PATCH v4 3/4] RISC-V: mm: Enable huge page support to
 kernel_page_present() function

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@...rfivetech.com>
> Reviewed-by: Ley Foon Tan <leyfoon.tan@...rfivetech.com>
> Reviewed-by: Mason Huo <mason.huo@...rfivetech.com>
> ---
>  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@...tanamicro.com>

Thanks,
drew