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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 , Huacai Chen Subject: [PATCH v7 03/29] loongarch: mm: add PMD swap-exclusive helpers Date: Mon, 14 Sep 2026 04:41:55 -0700 Message-ID: <20260914114320.12988-4-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-Stat-Signature: ery75szjnwcm8zpcd1int9ms9b8pu9cs X-Rspam-User: X-Rspamd-Queue-Id: 919CFA0004 X-Rspamd-Server: rspam03 X-HE-Tag: 1789386221-82195 X-HE-Meta: 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 4gAGG+dE n4H1iuT/i8NC7My+XK5XYGafRUvWwWqjP3iRuk/Y+nkhCfmdfldUM2ov1oaZ55ybG+Vn0gia4mG05L2enkbynFupS+VP3To7kuJGUl/bLvm3uPaUx72uA2Tk9uZwcUs1YlIAXMh1HxPcvJdfm3khNVolhev9fbxsd0z6PpIju1c5VTUoPXtID5JUlqygaKHPoXMnp+7gJ2bDhmXpkmygSD+HVygSBx4+8PUWOb04HhR7Y94jU7o4H7Jz8GznafTqAtTwx/atBCf2c+BLEwgUTVALjNw== 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. A LoongArch swap PMD is the swap PTE value plus _PAGE_HUGE, and _PAGE_SWP_EXCLUSIVE sits outside both the type and the offset field, so the PMD helpers can use the same bit. Cc: Huacai Chen Signed-off-by: Usama Arif --- arch/loongarch/include/asm/pgtable.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h index cf29a4c8ac593..87fecc3a51001 100644 --- a/arch/loongarch/include/asm/pgtable.h +++ b/arch/loongarch/include/asm/pgtable.h @@ -351,6 +351,25 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte) return pte; } +#ifdef CONFIG_ARCH_HAS_PMD_SOFTLEAVES +static inline pmd_t pmd_swp_mkexclusive(pmd_t pmd) +{ + pmd_val(pmd) |= _PAGE_SWP_EXCLUSIVE; + return pmd; +} + +static inline bool pmd_swp_exclusive(pmd_t pmd) +{ + return pmd_val(pmd) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pmd_t pmd_swp_clear_exclusive(pmd_t pmd) +{ + pmd_val(pmd) &= ~_PAGE_SWP_EXCLUSIVE; + return pmd; +} +#endif + #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) #define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE)) #define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC) -- 2.53.0-Meta