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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 , Madhavan Srinivasan Subject: [RESEND v7 04/29] powerpc: mm: add PMD swap-exclusive helpers Date: Mon, 14 Sep 2026 05:27:54 -0700 Message-ID: <20260914122950.3283997-5-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: CEAC4C0005 X-Stat-Signature: jghpbsi6obakijz4bquxby1cide439zo X-Rspam-User: X-HE-Tag: 1789389052-337466 X-HE-Meta: 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 VGTa6qsY N+Xdmdir4xwae8lqSJdeZ2xJjj39VtDI225bTuu9sQJjQ3F9+ZEHPmNvZfIKs5pHs4Y9fiCuir0fTDbTGU+w3vz5gIMzvwwufRRgtbsjj0Tl6icgnDVeFD0QVfoaN/wuvMjS0KFNK4zyUkmPJ0UO5UUiMxJc2XIaNwKSMNKHdN3NEp14APP2Y/Sy2o5zDygiOpm/QuOGkfumv0IrBSCXaaFWf0Ytvswi60R7Tn3xOVe3AGmW8njmw1wnghiVrl8KUmqtM 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. book3s64 builds a swap PMD by running the PTE encoding over pmd_pte(), so the PMD helpers use the same _PAGE_SWP_EXCLUSIVE bit. It is also the only powerpc variant that selects ARCH_HAS_PMD_SOFTLEAVES, via PPC_THP. Cc: Madhavan Srinivasan Signed-off-by: Usama Arif --- arch/powerpc/include/asm/book3s/64/pgtable.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index dff8790a047db..28943ef3c1c80 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -699,6 +699,23 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte) return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_SWP_EXCLUSIVE)); } +#ifdef CONFIG_ARCH_HAS_PMD_SOFTLEAVES +static inline pmd_t pmd_swp_mkexclusive(pmd_t pmd) +{ + return __pmd_raw(pmd_raw(pmd) | cpu_to_be64(_PAGE_SWP_EXCLUSIVE)); +} + +static inline bool pmd_swp_exclusive(pmd_t pmd) +{ + return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_SWP_EXCLUSIVE)); +} + +static inline pmd_t pmd_swp_clear_exclusive(pmd_t pmd) +{ + return __pmd_raw(pmd_raw(pmd) & cpu_to_be64(~_PAGE_SWP_EXCLUSIVE)); +} +#endif + static inline bool check_pte_access(unsigned long access, unsigned long ptev) { /* -- 2.53.0-Meta