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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: [PATCH v8 04/30] powerpc: mm: add PMD swap-exclusive helpers Date: Fri, 2 Oct 2026 02:52:18 -0700 Message-ID: <20261002095503.3585565-5-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: rspam05 X-Rspamd-Queue-Id: 8A305A0006 X-Stat-Signature: epbpxskm3175ji9bzcs8ae8xgxo5scph X-Rspam-User: X-HE-Tag: 1790934963-332714 X-HE-Meta: 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 PxsE9fsw rphxR/kuC7caCk/Yp1M1MhCH8qbwZMakwnWKPuygGMTXdUgMTR/SD9BgPo4jLaf7E17elJ2+MJLdjaIRtY3SNqk939ftT8POTWBEt8nmluGyQx0+nMmQ5cTKB7mQ3AsZwfKHsLMu/T9dJ9ty6j/yLJSw21OBSYRDIJshWp0iFaWevEx2lghBayzBaSF7roXfhkCnCdHf18nEjk3tMZxuBWROFM985dR0pkPymuZUrji2w1VBsqTE/PhAJEg== 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. book3s64 builds a swap PMD by running the PTE encoding over pmd_pte(), so the PMD helpers wrap the PTE ones and reuse _PAGE_SWP_EXCLUSIVE, exactly as the soft-dirty PMD helpers next to them do. 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 | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index dff8790a047db..458c85cebfa65 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -1060,6 +1060,12 @@ static inline pte_t *pmdp_ptep(pmd_t *pmd) #endif #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */ +#ifdef CONFIG_ARCH_HAS_PMD_SOFTLEAVES +#define pmd_swp_mkexclusive(pmd) pte_pmd(pte_swp_mkexclusive(pmd_pte(pmd))) +#define pmd_swp_exclusive(pmd) pte_swp_exclusive(pmd_pte(pmd)) +#define pmd_swp_clear_exclusive(pmd) pte_pmd(pte_swp_clear_exclusive(pmd_pte(pmd))) +#endif + #ifdef CONFIG_ARCH_HAS_PTE_PROTNONE static inline int pmd_protnone(pmd_t pmd) { -- 2.53.0-Meta