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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 v7 07/29] x86: mm: add PMD swap-exclusive helpers Date: Mon, 14 Sep 2026 04:41:59 -0700 Message-ID: <20260914114320.12988-8-usama.arif@linux.dev> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260914114320.12988-1-usama.arif@linux.dev> References: <20260914114320.12988-1-usama.arif@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: C1123180002 X-Stat-Signature: jwyjek9wasrmhjr1u6kxz641urs3w9kk X-HE-Tag: 1789386244-966256 X-HE-Meta: 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 faSOFW2y cJhT3cf/gIzhz0pgEo/C50iJBaMGPJRcr/ZIzExtob1fSbA0vcgcGbYp4whFusaYoD5BDeajc/sjpj+zKadxxudHL43MhR6aqmsxuLW19P1qpVz/ERec3vZRQq6fXHH8i11G+RAV5EtrHTMLm+bKL+SPEOc0ShOYAgTP5LfnlLhjEdbejVvIhE90W/jOsBOHm/U+p9HypuUtkO2Rv0pb6JltRDV7pUfw4a3hIcz1fS1Bjn14vhtar3U915E2u8tRwyiwqNS9DOLBy/xji/gzw9+bbkXE9VkALE92YUBHGtj0h8HI= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: A later patch keeps a PMD-mapped anonymous THP mapped by a PMD across the swap round-trip, so PG_anon_exclusive now has 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. Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: x86@kernel.org Signed-off-by: Usama Arif --- arch/x86/include/asm/pgtable.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index d551120a7c889..a2d1cd03cba23 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -1525,6 +1525,23 @@ 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 +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