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Howlett , ryan.roberts@arm.com, Vlastimil Babka , 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 , Paul Walmsley , Palmer Dabbelt , Albert Ou Subject: [PATCH v8 05/30] riscv: mm: add PMD swap-exclusive helpers Date: Fri, 2 Oct 2026 02:52:19 -0700 Message-ID: <20261002095503.3585565-6-usama.arif@linux.dev> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261002095503.3585565-1-usama.arif@linux.dev> References: <20261002095503.3585565-1-usama.arif@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Stat-Signature: qwfpepwjp4tu94rojnjbr5ph4ac4pqqr X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 0CAEBC0004 X-HE-Tag: 1790934969-743001 X-HE-Meta: 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 VjbPChHX FmAk3I4RSClaIxyKWCG9c7AWQeue2jbvB+gD/a0QSsgOCZbAnme1NG0autKl1t7bvuntgjQ2Mb9yg+Euk4dFBDxrMHc1dVlP+ZU0MPSSqp6PUX+771ifJSSynKbDzAQOtPYIq/wVp2kCTRiQH4MRfOEA/fprDkLLSmy87Nkp3rPyWYe86IX0MUlA1Z+vlrvV+hiZ06vioAG7QlZ0cAkZ5n8kGF+/kGvDEHOXkjqYOIi2oVh2WKiKw7a2Hwfj5+46zLWgvpgLegMLL7ePkFAFty5Nf6uWoWYJglkiO11yxOEos8PS83uWnRycKKA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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. riscv encodes a swap PMD exactly like a swap PTE, so the new helpers wrap the PTE ones and reuse _PAGE_SWP_EXCLUSIVE. Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Albert Ou Signed-off-by: Usama Arif Reviewed-by: David Hildenbrand (Arm) --- arch/riscv/include/asm/pgtable.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index d48f90140841e..b644db16bda94 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -1219,6 +1219,21 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte) } #ifdef CONFIG_ARCH_HAS_PMD_SOFTLEAVES +static inline bool pmd_swp_exclusive(pmd_t pmd) +{ + return pte_swp_exclusive(pmd_pte(pmd)); +} + +static inline pmd_t pmd_swp_mkexclusive(pmd_t pmd) +{ + return pte_pmd(pte_swp_mkexclusive(pmd_pte(pmd))); +} + +static inline pmd_t pmd_swp_clear_exclusive(pmd_t pmd) +{ + return pte_pmd(pte_swp_clear_exclusive(pmd_pte(pmd))); +} + #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) }) #define __swp_entry_to_pmd(swp) __pmd((swp).val) #endif /* CONFIG_ARCH_HAS_PMD_SOFTLEAVES */ -- 2.53.0-Meta