On Fri, Mar 18, 2022 at 10:59:10AM +0100, David Hildenbrand wrote:
> diff --git a/arch/arm64/include/asm/pgtable-prot.h b/arch/arm64/include/asm/pgtable-prot.h
> index b1e1b74d993c..fd6ddf14c190 100644
> --- a/arch/arm64/include/asm/pgtable-prot.h
> +++ b/arch/arm64/include/asm/pgtable-prot.h
> @@ -14,6 +14,7 @@
> * Software defined PTE bits definition.
> */
> #define PTE_WRITE (PTE_DBM) /* same as DBM (51) */
> +#define PTE_SWP_EXCLUSIVE (PTE_TABLE_BIT) /* only for swp ptes */
> #define PTE_DIRTY (_AT(pteval_t, 1) << 55)
> #define PTE_SPECIAL (_AT(pteval_t, 1) << 56)
> #define PTE_DEVMAP (_AT(pteval_t, 1) << 57)
> diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
> index 94e147e5456c..c78994073cd0 100644
> --- a/arch/arm64/include/asm/pgtable.h
> +++ b/arch/arm64/include/asm/pgtable.h
> @@ -402,6 +402,22 @@ static inline pgprot_t mk_pmd_sect_prot(pgprot_t prot)
> return __pgprot((pgprot_val(prot) & ~PMD_TABLE_BIT) | PMD_TYPE_SECT);
> }
>
> +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
> +static inline pte_t pte_swp_mkexclusive(pte_t pte)
> +{
> + return set_pte_bit(pte, __pgprot(PTE_SWP_EXCLUSIVE));
> +}
> +
> +static inline int pte_swp_exclusive(pte_t pte)
> +{
> + return pte_val(pte) & PTE_SWP_EXCLUSIVE;
> +}
> +
> +static inline pte_t pte_swp_clear_exclusive(pte_t pte)
> +{
> + return clear_pte_bit(pte, __pgprot(PTE_SWP_EXCLUSIVE));
> +}
> +
> #ifdef CONFIG_NUMA_BALANCING
> /*
> * See the comment in include/linux/pgtable.h
> @@ -908,7 +924,8 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
>
> /*
> * Encode and decode a swap entry:
> - * bits 0-1: present (must be zero)
> + * bits 0: present (must be zero)
> + * bits 1: remember PG_anon_exclusive
It looks fine to me.
Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>
