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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 , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org Subject: [PATCH v8 07/30] x86: mm: add PMD swap-exclusive helpers Date: Fri, 2 Oct 2026 02:52:21 -0700 Message-ID: <20261002095503.3585565-8-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: a7thi94nrze1tssyq3pieqbwmywtiqpr X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: A17B740007 X-HE-Tag: 1790934979-264958 X-HE-Meta: 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 7cmF9hRy 4xYGeja2kuztY5y+hI7JQvJsA+vCucSwiWuhc87FaeHi29FiJVP7xcYIiRsQMolClokbGg5KvejELkPPMFO7AvAkogVSxMtD+NRHbhVejoaD0B7xTgJxnQsdDGE8Efxig8GoIl9ptA46vFx95o71NRSElxJIKR/rzIbyFLYuTQTIdMJf8o+HHBvCGX0EfJFd7A6EW/IiFZmOrezdRi5MSwiVwo+3fUuObE+NOdP906dvcmrSueO0gibfJsoJQKtqlsn7P0GTAq6rWSOrmAF3kxNBtEvhpl4uHC7yebceoIXq2zH0= 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. x86-64 encodes a swap PMD exactly like a swap PTE, so the new helpers reuse _PAGE_SWP_EXCLUSIVE, bit 3, which the swap-entry layout already reserves for PG_anon_exclusive. 32-bit x86 aliases that bit to _PAGE_PSE and does not select ARCH_HAS_PMD_SOFTLEAVES; assert that, because an exclusive swap PMD would otherwise be pmd_present(). Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: x86@kernel.org Signed-off-by: Usama Arif Reviewed-by: Kiryl Shutsemau (Meta) Reviewed-by: David Hildenbrand (Arm) --- arch/x86/include/asm/pgtable.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index d551120a7c889..c35dfa6ceda05 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -1525,6 +1525,26 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte) return pte_clear_flags(pte, _PAGE_SWP_EXCLUSIVE); } +#ifdef CONFIG_ARCH_HAS_PMD_SOFTLEAVES +/* 32-bit aliases this to _PAGE_PSE, making an exclusive swap PMD present. */ +static_assert(_PAGE_SWP_EXCLUSIVE != _PAGE_PSE); + +static inline pmd_t pmd_swp_mkexclusive(pmd_t pmd) +{ + return pmd_set_flags(pmd, _PAGE_SWP_EXCLUSIVE); +} + +static inline bool pmd_swp_exclusive(pmd_t pmd) +{ + return pmd_flags(pmd) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pmd_t pmd_swp_clear_exclusive(pmd_t pmd) +{ + return pmd_clear_flags(pmd, _PAGE_SWP_EXCLUSIVE); +} +#endif + #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY static inline pte_t pte_swp_mksoft_dirty(pte_t pte) { -- 2.53.0-Meta