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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 , Huacai Chen Subject: [PATCH v8 03/30] loongarch: mm: add PMD swap-exclusive helpers Date: Fri, 2 Oct 2026 02:52:17 -0700 Message-ID: <20261002095503.3585565-4-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-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: EA4EF100008 X-Stat-Signature: 11ri3mq9i68ur83crh16kxiqus3me5gj X-Rspam-User: X-HE-Tag: 1790934955-337691 X-HE-Meta: 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 S+7JPZkf RgFpURjU6KhgD7hW2yeK48HU0DsPb6a1JiFRTAJ4R2DR/E3LIqxcvVT5GYkSLuz2NZotP7XKzLxFAXE8ZP5FbUH4uMvN7llh2jIey/XMQzlgy9ZnfuJCI7102u9Ga9PqTb5S2EhWERms8dVT+/DS396ZxAqxx+LppFio7optsMHeavIyMrm6sT9LEAo4YyomYMSa5gOqZX3X0W40bG1XfMkCSyB2qjoF26p+EGH0+SPqJ6K9Nu85tFSyx34pg7XzANxczZx61ncCrQH2sKNYGfR8rDA== 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. A LoongArch swap PMD is the swap PTE value plus _PAGE_HUGE, and _PAGE_SWP_EXCLUSIVE sits outside both the type and the offset field, so the PMD helpers can use the same bit. Cc: Huacai Chen Signed-off-by: Usama Arif Reviewed-by: David Hildenbrand (Arm) --- arch/loongarch/include/asm/pgtable.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h index cf29a4c8ac593..87fecc3a51001 100644 --- a/arch/loongarch/include/asm/pgtable.h +++ b/arch/loongarch/include/asm/pgtable.h @@ -351,6 +351,25 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte) return pte; } +#ifdef CONFIG_ARCH_HAS_PMD_SOFTLEAVES +static inline pmd_t pmd_swp_mkexclusive(pmd_t pmd) +{ + pmd_val(pmd) |= _PAGE_SWP_EXCLUSIVE; + return pmd; +} + +static inline bool pmd_swp_exclusive(pmd_t pmd) +{ + return pmd_val(pmd) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pmd_t pmd_swp_clear_exclusive(pmd_t pmd) +{ + pmd_val(pmd) &= ~_PAGE_SWP_EXCLUSIVE; + return pmd; +} +#endif + #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE)) #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC) -- 2.53.0-Meta