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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 , Catalin Marinas , Will Deacon Subject: [PATCH v8 02/30] arm64: mm: add PMD swap-exclusive helpers Date: Fri, 2 Oct 2026 02:52:16 -0700 Message-ID: <20261002095503.3585565-3-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: rspam08 X-Rspamd-Queue-Id: C7EFEC0002 X-Rspam-User: X-Stat-Signature: nfpn1zspb76w1d6bisff1j5epdf34km9 X-HE-Tag: 1790934952-151499 X-HE-Meta: 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 bqTx61Wu gJT6P9qBh4SbEesY0p942q1IvZYcefRnQd2GTkmFm+JMAkxwazx0jznC9FLtIuASkQK/paNYHsnH3vfydLd9BPJFYFJXVrCIPc2P2rHqf9Al+hIBVvDxxqlyC87rnBYyPsYgO9ve3si7bj2EDPKlEXeiXiBHoFyxopt9C7jLCTSgO3AXlw0Osy9bXJ+O5/65GfQHMd2v4xX6I5UxP04dCoGm13IOlTQqSXAKCDEK9103t7ltNXJ4ALXtUPKY05qY5I2u5vhMvXj2k0mXIA0nV7vJg6O98W+u260fGLHqJAIH/6vM2Bo0t0iruut7xMACYeKj5 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. 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 Cc: Will Deacon Signed-off-by: Usama Arif --- 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 e89ec5f4787b4..d3f53a601aed3 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -599,6 +599,12 @@ 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