From: LEROY Christophe <christophe.leroy2@cs-soprasteria.com>
To: Usama Arif <usama.arif@linux.dev>,
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Madhavan Srinivasan <maddy@linux.ibm.com>
Subject: Re: [PATCH v8 04/30] powerpc: mm: add PMD swap-exclusive helpers
Date: Mon, 5 Oct 2026 04:55:39 +0000 [thread overview]
Message-ID: <4a4bf0ca-b21b-4b37-b2e3-9bd8ba343bd6@cs-soprasteria.com> (raw)
In-Reply-To: <20261002095503.3585565-5-usama.arif@linux.dev>
Don't forget to CC <linuxppc-dev@lists.ozlabs.org> when addressing
powerpc architecture.
Le 02/10/2026 à 11:52, Usama Arif a écrit :
> Prepare for keeping a PMD-mapped anonymous THP mapped by a PMD across the
> swap round-trip, which makes PG_anon_exclusive have to survive in a swap
> PMD and not just in a swap PTE.
>
> book3s64 builds a swap PMD by running the PTE encoding over pmd_pte(), so
> the PMD helpers wrap the PTE ones and reuse _PAGE_SWP_EXCLUSIVE, exactly
> as the soft-dirty PMD helpers next to them do. It is also the only powerpc
> variant that selects ARCH_HAS_PMD_SOFTLEAVES, via PPC_THP.
>
> Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
> Signed-off-by: Usama Arif <usama.arif@linux.dev>
> ---
> arch/powerpc/include/asm/book3s/64/pgtable.h | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
> index dff8790a047db..458c85cebfa65 100644
> --- a/arch/powerpc/include/asm/book3s/64/pgtable.h
> +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
> @@ -1060,6 +1060,12 @@ static inline pte_t *pmdp_ptep(pmd_t *pmd)
> #endif
> #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
>
> +#ifdef CONFIG_ARCH_HAS_PMD_SOFTLEAVES
> +#define pmd_swp_mkexclusive(pmd) pte_pmd(pte_swp_mkexclusive(pmd_pte(pmd)))
> +#define pmd_swp_exclusive(pmd) pte_swp_exclusive(pmd_pte(pmd))
> +#define pmd_swp_clear_exclusive(pmd) pte_pmd(pte_swp_clear_exclusive(pmd_pte(pmd)))
> +#endif
> +
> #ifdef CONFIG_ARCH_HAS_PTE_PROTNONE
> static inline int pmd_protnone(pmd_t pmd)
> {
next prev parent reply other threads:[~2026-10-05 4:55 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-02 9:52 [PATCH v8 00/30] mm: PMD-level swap entries for anonymous THPs Usama Arif
2026-10-02 9:52 ` [PATCH v8 01/30] mm: rename pmd_to_softleaf_folio() to pmd_softleaf_to_folio() Usama Arif
2026-10-02 9:52 ` [PATCH v8 02/30] arm64: mm: add PMD swap-exclusive helpers Usama Arif
2026-10-02 9:52 ` [PATCH v8 03/30] loongarch: " Usama Arif
2026-10-02 14:17 ` Huacai Chen
2026-10-02 9:52 ` [PATCH v8 04/30] powerpc: " Usama Arif
2026-10-05 4:55 ` LEROY Christophe [this message]
2026-10-02 9:52 ` [PATCH v8 05/30] riscv: " Usama Arif
2026-10-02 9:52 ` [PATCH v8 06/30] s390: " Usama Arif
2026-10-02 9:52 ` [PATCH v8 07/30] x86: " Usama Arif
2026-10-05 20:14 ` Zi Yan
2026-10-02 9:52 ` [PATCH v8 08/30] mm: recognize PMD swap entries in the softleaf layer Usama Arif
2026-10-02 9:52 ` [PATCH v8 09/30] mm/debug_vm_pgtable: test PMD swap-exclusive helpers Usama Arif
2026-10-02 9:52 ` [PATCH v8 10/30] mm: make PMD migration-entry splitting explicit Usama Arif
2026-10-02 9:52 ` [PATCH v8 11/30] mm: split PMD swap entries into PTE swap entries Usama Arif
2026-10-02 9:52 ` [PATCH v8 12/30] mm/swap: allow duplicating a range of " Usama Arif
2026-10-02 9:52 ` [PATCH v8 13/30] mm: handle PMD swap entries in fork path Usama Arif
2026-10-02 9:52 ` [PATCH v8 14/30] mm: zswap: reject high-order swap cache allocations backed by zswap Usama Arif
2026-10-05 20:18 ` Yosry Ahmed
2026-10-02 9:52 ` [PATCH v8 15/30] mm: swap in PMD swap entries as whole THPs during swapoff Usama Arif
2026-10-02 9:52 ` [PATCH v8 16/30] fs/proc: account PMD swap entries in smaps Usama Arif
2026-10-02 9:52 ` [PATCH v8 17/30] mm: handle soft-dirty and uffd-wp on PMD swap entries Usama Arif
2026-10-02 9:52 ` [PATCH v8 18/30] mm/hmm: fault PMD swap entries on demand Usama Arif
2026-10-02 9:52 ` [PATCH v8 19/30] mm: free PMD swap entries in zap_huge_pmd() Usama Arif
2026-10-02 9:52 ` [PATCH v8 20/30] mm/madvise: free PMD swap entries with MADV_FREE Usama Arif
2026-10-02 9:52 ` [PATCH v8 21/30] mm/madvise: skip PMD swap entries for MADV_COLD and MADV_PAGEOUT Usama Arif
2026-10-02 9:52 ` [PATCH v8 22/30] mm/madvise: keep PMD swap entries whole for MADV_GUARD_INSTALL/REMOVE Usama Arif
2026-10-02 9:52 ` [PATCH v8 23/30] mm/mincore: report PMD swap-cache residency Usama Arif
2026-10-02 9:52 ` [PATCH v8 24/30] mm/khugepaged: treat PMD swap entries as mapped THPs Usama Arif
2026-10-02 9:52 ` [PATCH v8 25/30] mm: handle PMD swap entries in MADV_WILLNEED Usama Arif
2026-10-02 9:52 ` [PATCH v8 26/30] mm: handle PMD swap entries in UFFDIO_MOVE Usama Arif
2026-10-04 8:19 ` Lance Yang
2026-10-02 9:52 ` [PATCH v8 27/30] mm: don't PTE-batch a swap-in over a hardware-poisoned subpage Usama Arif
2026-10-02 9:52 ` [PATCH v8 28/30] mm: handle PMD swap entry faults on swap-in Usama Arif
2026-10-04 10:19 ` Lance Yang
2026-10-02 9:52 ` [PATCH v8 29/30] mm: install PMD swap entries on swap-out Usama Arif
2026-10-02 9:52 ` [PATCH v8 30/30] selftests/mm: add PMD swap entry tests Usama Arif
2026-10-02 14:28 ` [PATCH v8 00/30] mm: PMD-level swap entries for anonymous THPs David Hildenbrand (Arm)
2026-10-02 15:13 ` Zi Yan
2026-10-04 12:39 ` Usama Arif
2026-10-04 3:08 ` Lance Yang
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