From: Usama Arif <usama.arif@linux.dev>
To: Andrew Morton <akpm@linux-foundation.org>,
david@kernel.org, chrisl@kernel.org, kasong@tencent.com,
ljs@kernel.org, ziy@nvidia.com, linux-mm@kvack.org
Cc: ying.huang@linux.alibaba.com, Baoquan He <baoquan.he@linux.dev>,
willy@infradead.org, youngjun.park@lge.com, hannes@cmpxchg.org,
riel@surriel.com, shakeel.butt@linux.dev, alex@ghiti.fr,
kas@kernel.org, baohua@kernel.org, dev.jain@arm.com,
baolin.wang@linux.alibaba.com, Nico Pache <nico.pache@linux.dev>,
Liam R. Howlett <liam@infradead.org>,
ryan.roberts@arm.com, Vlastimil Babka <vbabka@kernel.org>,
lance.yang@linux.dev, linux-kernel@vger.kernel.org,
nphamcs@gmail.com, shikemeng@huaweicloud.com, yosry@kernel.org,
qi.zheng@linux.dev, luizcap@redhat.com, kernel-team@meta.com,
Usama Arif <usama.arif@linux.dev>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>
Subject: [PATCH v8 02/30] arm64: mm: add PMD swap-exclusive helpers
Date: Fri, 2 Oct 2026 02:52:16 -0700 [thread overview]
Message-ID: <20261002095503.3585565-3-usama.arif@linux.dev> (raw)
In-Reply-To: <20261002095503.3585565-1-usama.arif@linux.dev>
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.
arm64 encodes a swap PMD exactly like a swap PTE, so the new helpers wrap
the PTE ones and reuse PTE_SWP_EXCLUSIVE.
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Usama Arif <usama.arif@linux.dev>
---
arch/arm64/include/asm/pgtable.h | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index e89ec5f4787b4..d3f53a601aed3 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -599,6 +599,12 @@ static inline int pmd_protnone(pmd_t pmd)
#define pmd_swp_clear_uffd(pmd) \
pte_pmd(pte_swp_clear_uffd(pmd_pte(pmd)))
#endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
+#ifdef CONFIG_ARCH_HAS_PMD_SOFTLEAVES
+#define pmd_swp_exclusive(pmd) pte_swp_exclusive(pmd_pte(pmd))
+#define pmd_swp_mkexclusive(pmd) pte_pmd(pte_swp_mkexclusive(pmd_pte(pmd)))
+#define pmd_swp_clear_exclusive(pmd) \
+ pte_pmd(pte_swp_clear_exclusive(pmd_pte(pmd)))
+#endif
#define pmd_write(pmd) pte_write(pmd_pte(pmd))
--
2.53.0-Meta
next prev parent reply other threads:[~2026-10-02 9:55 UTC|newest]
Thread overview: 34+ 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 ` Usama Arif [this message]
2026-10-02 9:52 ` [PATCH v8 03/30] loongarch: mm: add PMD swap-exclusive helpers Usama Arif
2026-10-02 14:17 ` Huacai Chen
2026-10-02 9:52 ` [PATCH v8 04/30] powerpc: " Usama Arif
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
2026-10-02 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
2026-10-02 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
2026-10-02 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
2026-10-02 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
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