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: chenhuacai@kernel.org, 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>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v9 02/32] arm64: mm: add PMD swap-exclusive helpers
Date: Thu, 5 Nov 2026 10:38:46 -0800 [thread overview]
Message-ID: <20261105183940.2236717-3-usama.arif@linux.dev> (raw)
In-Reply-To: <20261105183940.2236717-1-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>
Cc: linux-arm-kernel@lists.infradead.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 a474c9fb485ad..dfcb4b9e66f39 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -560,6 +560,12 @@ 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
parent reply other threads:[~2026-11-05 18:40 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20261105183940.2236717-1-usama.arif@linux.dev>]
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