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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 , loongarch@lists.linux.dev Subject: [PATCH v9 03/32] loongarch: mm: add PMD swap-exclusive helpers Date: Thu, 5 Nov 2026 10:38:47 -0800 Message-ID: <20261105183940.2236717-4-usama.arif@linux.dev> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261105183940.2236717-1-usama.arif@linux.dev> References: <20261105183940.2236717-1-usama.arif@linux.dev> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: yqyq8e79bzjfg6f49p4kes4z9htxpa9x X-Rspamd-Server: rspam01 X-Rspam-User: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Rspamd-Queue-Id: B26A280005 X-HE-Tag: 1793904003-945386 X-HE-Meta: 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 YcXtZbMU v+WdiMcWI9df4cfSh3kGWp2TyR2P2PISxEKlc34DQwqFkvs/PVMu4zx6hppfoCP8sEwxtiQabzVPKl3q+Dt1S/J8eYjy/UkVEUcRHxPeE0KtujaKdJiVN16tvx8fhKSDFUIrEv73qHJlTmkHxaK2pBToI4Yqfw89a9YgJzOXPk0YGkB/nqm4mSbKoTWHvijnYX3nh63ZR5vu07NphkdyFvumni7DjLhZx1R0+UVs0AOaXa7QMXyR+4osGH5ydzbyCDJBvGIOqFo9eQxqQWDaPLltknA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 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. 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 Cc: loongarch@lists.linux.dev Signed-off-by: Usama Arif Reviewed-by: David Hildenbrand (Arm) --- 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 f876031351319..30a256a99bfcf 100644 --- a/arch/loongarch/include/asm/pgtable.h +++ b/arch/loongarch/include/asm/pgtable.h @@ -352,6 +352,25 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte) return pte; } +#ifdef CONFIG_ARCH_HAS_PMD_SOFTLEAVES +static inline bool pmd_swp_exclusive(pmd_t pmd) +{ + return pmd_val(pmd) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pmd_t pmd_swp_mkexclusive(pmd_t pmd) +{ + pmd_val(pmd) |= _PAGE_SWP_EXCLUSIVE; + return pmd; +} + +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