From: Catalin Marinas <catalin.marinas@arm•com>
To: David Hildenbrand <david@redhat•com>
Cc: x86@kernel•org, Jan Kara <jack@suse•cz>,
Yang Shi <shy828301@gmail•com>,
Dave Hansen <dave.hansen@linux•intel.com>,
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Mike Kravetz <mike.kravetz@oracle•com>
Subject: Re: [PATCH v1 4/7] arm64/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE
Date: Fri, 18 Mar 2022 11:33:00 +0000 [thread overview]
Message-ID: <YjRt7DqDFJRZA7Gt@arm.com> (raw)
In-Reply-To: <8989a07b-3a5b-0c81-983f-b35403d19579@redhat.com>
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@arm•com>
next prev parent reply other threads:[~2022-03-18 11:33 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-15 14:18 [PATCH v1 0/7] mm: COW fixes part 3: reliable GUP R/W FOLL_GET of anonymous pages David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 1/7] mm/swap: remember PG_anon_exclusive via a swp pte bit David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 2/7] mm/debug_vm_pgtable: add tests for __HAVE_ARCH_PTE_SWP_EXCLUSIVE David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 3/7] x86/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 4/7] arm64/pgtable: " David Hildenbrand
2022-03-16 18:27 ` Catalin Marinas
2022-03-17 10:04 ` David Hildenbrand
2022-03-17 17:58 ` Catalin Marinas
2022-03-18 9:59 ` David Hildenbrand
2022-03-18 11:33 ` Catalin Marinas [this message]
2022-03-18 14:14 ` David Hildenbrand
2022-03-21 14:38 ` Will Deacon
2022-03-21 14:39 ` Will Deacon
2022-03-21 15:07 ` David Hildenbrand
2022-03-21 17:44 ` Will Deacon
2022-03-21 18:27 ` Catalin Marinas
2022-03-22 9:46 ` David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 5/7] s390/pgtable: " David Hildenbrand
2022-03-15 16:21 ` Gerald Schaefer
2022-03-15 16:37 ` David Hildenbrand
2022-03-15 16:58 ` David Hildenbrand
2022-03-15 17:12 ` David Hildenbrand
2022-03-15 17:14 ` David Hildenbrand
2022-03-16 10:56 ` Gerald Schaefer
2022-03-16 11:06 ` David Hildenbrand
2022-03-16 13:01 ` Christian Borntraeger
2022-03-16 13:27 ` Gerald Schaefer
2022-03-16 14:00 ` David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 6/7] powerpc/pgtable: remove _PAGE_BIT_SWAP_TYPE for book3s David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 7/7] powerpc/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE " David Hildenbrand
2022-03-18 23:48 ` [PATCH v1 0/7] mm: COW fixes part 3: reliable GUP R/W FOLL_GET of anonymous pages Jason Gunthorpe
2022-03-19 11:17 ` David Hildenbrand
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