linux-kernel - Re: [PATCH 2/4] mm/sparse-vmemmap: set pte

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Message-ID: <CAAhV-H6-m6PhD49X3UyHYhCggAruf=5g9zh=6FvNc5004Z5New@mail.gmail.com>
Date: Sat, 12 Oct 2024 10:17:46 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: Bibo Mao <maobibo@...ngson.cn>
Cc: Andrey Ryabinin <ryabinin.a.a@...il.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	David Hildenbrand <david@...hat.com>, Barry Song <baohua@...nel.org>, loongarch@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com, linux-mm@...ck.org
Subject: Re: [PATCH 2/4] mm/sparse-vmemmap: set pte_init when vmemmap is created

Hi, Bibo,

Just declare kernel_pte_init() in header file. Since this series is a
bugfix, we should merge it as soon as possible. The refactoring patch
can be sent after this series.

Huacai

On Thu, Oct 10, 2024 at 11:50 AM Bibo Mao <maobibo@...ngson.cn> wrote:
>
> Like pmd_init(), a weak function kernel_pte_init() is added and it
> is only effective on LoongArch system. When pte table is created for
> vmemmap kernel space, function kernel_pte_init() is called here.
>
> It has no any effective on other architectures.
>
> Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
> ---
>  mm/sparse-vmemmap.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
> index edcc7a6b0f6f..c0388b2e959d 100644
> --- a/mm/sparse-vmemmap.c
> +++ b/mm/sparse-vmemmap.c
> @@ -184,6 +184,10 @@ static void * __meminit vmemmap_alloc_block_zero(unsigned long size, int node)
>         return p;
>  }
>
> +void __weak __meminit kernel_pte_init(void *addr)
> +{
> +}
> +
>  pmd_t * __meminit vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node)
>  {
>         pmd_t *pmd = pmd_offset(pud, addr);
> @@ -191,6 +195,7 @@ pmd_t * __meminit vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node)
>                 void *p = vmemmap_alloc_block_zero(PAGE_SIZE, node);
>                 if (!p)
>                         return NULL;
> +               kernel_pte_init(p);
>                 pmd_populate_kernel(&init_mm, pmd, p);
>         }
>         return pmd;
> --
> 2.39.3
>