linux-kernel - Re: [PATCH v3] LoongArch: add p?d

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Message-ID: <CAAhV-H54scsYV_jCVY_SQ8VVRpjuDreTtJ5d1JvQFNmr59_5hQ@mail.gmail.com>
Date:   Thu, 7 Sep 2023 09:36:06 +0800
From:   Huacai Chen <chenhuacai@...nel.org>
To:     Hongchen Zhang <zhanghongchen@...ngson.cn>
Cc:     WANG Xuerui <kernel@...0n.name>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        "Mike Rapoport IBM)" <rppt@...nel.org>,
        Feiyang Chen <chenfeiyang@...ngson.cn>,
        Qi Zheng <zhengqi.arch@...edance.com>,
        "Matthew Wilcox Oracle)" <willy@...radead.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH v3] LoongArch: add p?d_leaf() definitions

Queued for loongarch-next, thanks.

Huacai

On Wed, Sep 6, 2023 at 5:20 PM Hongchen Zhang <zhanghongchen@...ngson.cn> wrote:
>
> When I do LTP test, LTP test case ksm06 caused panic at
>         break_ksm_pmd_entry
>           -> pmd_leaf (Huge page table but False)
>           -> pte_present (panic)
>
> The reason is pmd_leaf is not defined, So like
> commit 501b81046701 ("mips: mm: add p?d_leaf() definitions")
> add p?d_leaf() definition for LoongArch.
>
> Fixes: 09cfefb7fa70 ("LoongArch: Add memory management")
> Cc: stable@...r.kernel.org
> Signed-off-by: Hongchen Zhang <zhanghongchen@...ngson.cn>
> ---
> v2->v3: add Cc: stable@...r.kernel.org
> v1->v2: add Fixes in commit message
> ---
>  arch/loongarch/include/asm/pgtable.h | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h
> index 370c6568ceb8..ea54653b7aab 100644
> --- a/arch/loongarch/include/asm/pgtable.h
> +++ b/arch/loongarch/include/asm/pgtable.h
> @@ -243,6 +243,9 @@ static inline void pmd_clear(pmd_t *pmdp)
>
>  #define pmd_phys(pmd)          PHYSADDR(pmd_val(pmd))
>
> +#define pmd_leaf(pmd)          ((pmd_val(pmd) & _PAGE_HUGE) != 0)
> +#define pud_leaf(pud)          ((pud_val(pud) & _PAGE_HUGE) != 0)
> +
>  #ifndef CONFIG_TRANSPARENT_HUGEPAGE
>  #define pmd_page(pmd)          (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
>  #endif /* CONFIG_TRANSPARENT_HUGEPAGE  */
> --
> 2.33.0
>
>