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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: [RESEND v7 02/29] arm64: mm: add PMD swap-exclusive helpers Date: Mon, 14 Sep 2026 05:27:52 -0700 Message-ID: <20260914122950.3283997-3-usama.arif@linux.dev> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260914122950.3283997-1-usama.arif@linux.dev> References: <20260914122950.3283997-1-usama.arif@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 7648CC0006 X-Stat-Signature: 8m4ntmffze99u5egph1mmcy4hkobiwm5 X-Rspam-User: X-HE-Tag: 1789389047-143924 X-HE-Meta: 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 EVHAwk0G ErFa5lANmywY/ZrBLz4yirJB37/8J6B3ZkG84ZlX8qS7ROdOp0MeOqo0YJQKuPBUXrGGwqfEOdRmXSHI8kr02zsURv1SuAIj4ugnv0ARl72QjSBav0biHFMPVFS53wJZUjvnlzDjwte5WmDWSZhZ+G4CSwziBtBUvbqs0Jz+UdST7l47GiT/GKMeKV/t1MHVTHL7VPIhyx/RNKhJP5K2HGrFCRgYfAGSOubAoKTvHwl2yfxPzl0tT3NzPEZCbOyrXPP+Ir+RPYv2bMpj3O0BnasWOa8Okfr8XfnCc8zrywZR2x1it+eAMbkqYyw== 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. 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