Re: [PATCH v7 01/12] mm: x86, arm64: add arch_has_hw_pte_young()

Yu Zhao
2022-02-08T08:24:25Z

On Tue, Feb 08, 2022 at 01:18:51AM -0700, Yu Zhao wrote:

<snipped>

> diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
> index c4ba047a82d2..990358eca359 100644
> --- a/arch/arm64/include/asm/pgtable.h
> +++ b/arch/arm64/include/asm/pgtable.h
> @@ -999,23 +999,13 @@ static inline void update_mmu_cache(struct vm_area_struct *vma,
> * page after fork() + CoW for pfn mappings. We don't always have a
> * hardware-managed access flag on arm64.
> */
> -static inline bool arch_faults_on_old_pte(void)
> -{
> - WARN_ON(preemptible());
> -
> - return !cpu_has_hw_af();
> -}
> -#define arch_faults_on_old_pte arch_faults_on_old_pte
> +#define arch_has_hw_pte_young cpu_has_hw_af

Reworked arch_has_hw_pte_young() for arm64 according to:
https://lore.kernel.org/linux-mm/20220111141901.GA10338@willie-the-truck/

<snipped>