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d=arm.com; s=foss; t=1794753634; bh=IOwZLzBTzh9eQvjrTuwoQ1OhI4taf+RWz3s7nNKkGsw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DMEVOckw1bncfikR/EnGed2E3Z2HQv6tBEHDD6DNwp5YW2PUslaR2AIXb5/Gq6tCp 8+NsqxFXbKEp9lKCyxiV/D3wB/+ZsWC4gyT8qCCKDGygsZ0gggx8gEsNMAXNSaBPix efHhX4QG2x37fNTYQWwMb+8DBFYlDIhWS1gCWEg4= From: Dev Jain To: david@kernel.org, ljs@kernel.org, akpm@linux-foundation.org, hughd@google.com, chrisl@kernel.org, kasong@tencent.com, davem@davemloft.net, andreas@gaisler.com Cc: Dev Jain , riel@surriel.com, liam@infradead.org, vbabka@kernel.org, harry@kernel.org, jannh@google.com, lance.yang@linux.dev, baolin.wang@linux.alibaba.com, shikemeng@huaweicloud.com, nphamcs@gmail.com, baoquan.he@linux.dev, baohua@kernel.org, youngjun.park@lge.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, pfalcato@suse.de, anshuman.khandual@arm.com, geert@linux-m68k.org, sparclinux@vger.kernel.org, ryan.roberts@arm.com Subject: [PATCH v4 9/9] mm, sparc: batch arch_unmap_one() Date: Sun, 15 Nov 2026 14:39:04 +0000 Message-ID: <20261115143905.3045084-10-dev.jain@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261115143905.3045084-1-dev.jain@arm.com> References: <20261115143905.3045084-1-dev.jain@arm.com> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 5CAB940006 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-Stat-Signature: b17jf5ty69mn4efzbjf9ppoa9hyzpkax X-Rspam-User: X-HE-Tag: 1794753635-418969 X-HE-Meta: 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 TCzghcSE YiVvZCGAIfg2LLaJJfc+Z8Gta1vndhvCm9FN9LWsB7/+oNDsP26lKia1prMlflp5vxlJQ9psOCXyYBfvHMXUwx5a0hJwVUrE58EWmbTUmFZq4cWXOyDoZMA1Sp1zO7asvLGzhFgCMab5mqIJVmSvwJkQi9a8QZ+OBXUP5jP09VYtJTHqmDEdFZlV04wwc/l7hcH3Yey8IbJ8b019G8xWW6wkHmg14CIedSu9jc7J7n2xIM6cQwy7e3P7wYZ1bgMy5f2OgR8oGpBAh/37Hl1E5Ly2Ql2yLuD936aq69VG4qyFyRrQ= 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 The anonymous large-folio unmap batching path can clear and replace multiple PTEs at once, but architectures like sparc need arch_unmap_one() to preserve per-page metadata before swap entries are installed. sparc uses this hook to save ADI tags. Extend arch_unmap_one() to operate on a pte range. sparc uses the count to walk the PTE range and save ADI tags for entries carrying _PAGE_MCD_4V. There is no reverse operation for a partially saved range: saving ADI tags only records a copy for later restore, so if a later entry fails and the core keeps the original PTEs, there is no architectural state to unsave. Signed-off-by: Dev Jain --- arch/sparc/include/asm/pgtable_64.h | 10 +++++++--- arch/sparc/kernel/adi_64.c | 21 +++++++++++++++++++++ include/linux/pgtable.h | 6 +++--- mm/rmap.c | 11 +++-------- 4 files changed, 34 insertions(+), 14 deletions(-) diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h index 44d1333065a6a..f7dd1872884e4 100644 --- a/arch/sparc/include/asm/pgtable_64.h +++ b/arch/sparc/include/asm/pgtable_64.h @@ -1037,6 +1037,9 @@ void adi_restore_tags(struct mm_struct *mm, struct vm_area_struct *vma, int adi_save_tags(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, pte_t oldpte); +int adi_save_tags_range(struct mm_struct *mm, struct vm_area_struct *vma, + unsigned long addr, pte_t oldpte, unsigned long nr); + #define __HAVE_ARCH_DO_SWAP_PAGE static inline void arch_do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma, @@ -1057,10 +1060,11 @@ static inline void arch_do_swap_page(struct mm_struct *mm, #define __HAVE_ARCH_UNMAP_ONE static inline int arch_unmap_one(struct mm_struct *mm, struct vm_area_struct *vma, - unsigned long addr, pte_t oldpte) + unsigned long addr, pte_t oldpte, + unsigned long nr) { - if (adi_state.enabled && (pte_val(oldpte) & _PAGE_MCD_4V)) - return adi_save_tags(mm, vma, addr, oldpte); + if (adi_state.enabled) + return adi_save_tags_range(mm, vma, addr, oldpte, nr); return 0; } diff --git a/arch/sparc/kernel/adi_64.c b/arch/sparc/kernel/adi_64.c index 18036a43cf568..ffa378accefe3 100644 --- a/arch/sparc/kernel/adi_64.c +++ b/arch/sparc/kernel/adi_64.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include #include @@ -394,3 +395,23 @@ int adi_save_tags(struct mm_struct *mm, struct vm_area_struct *vma, return 0; } + +int adi_save_tags_range(struct mm_struct *mm, struct vm_area_struct *vma, + unsigned long addr, pte_t oldpte, unsigned long nr) +{ + unsigned long i; + + for (i = 0; i < nr; i++, addr += PAGE_SIZE, + oldpte = pte_next_pfn(oldpte)) { + int ret; + + if (!(pte_val(oldpte) & _PAGE_MCD_4V)) + continue; + + ret = adi_save_tags(mm, vma, addr, oldpte); + if (ret) + return ret; + } + + return 0; +} diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index 7e62479db5df7..71fa47b60e50c 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -1431,12 +1431,12 @@ static inline void arch_do_swap_page_nr(struct mm_struct *mm, * restored when the page is swapped back in. SPARC M7 and newer * processors support an ADI (Application Data Integrity) tag for the * page as metadata for the page. arch_unmap_one() can save this - * metadata on a swap-out of a page. + * metadata on swap-out of one or more pages. */ static inline int arch_unmap_one(struct mm_struct *mm, struct vm_area_struct *vma, - unsigned long addr, - pte_t orig_pte) + unsigned long addr, pte_t orig_pte, + unsigned long nr) { return 0; } diff --git a/mm/rmap.c b/mm/rmap.c index a2481323b778a..89dd71f84ff74 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1974,6 +1974,7 @@ static inline unsigned int folio_unmap_pte_batch(struct folio *folio, if (flags & TTU_HWPOISON) return 1; + if (!folio_test_large(folio)) return 1; @@ -1984,11 +1985,6 @@ static inline unsigned int folio_unmap_pte_batch(struct folio *folio, if (pte_unused(pte)) return 1; -#ifdef __HAVE_ARCH_UNMAP_ONE - if (folio_test_anon(folio) && folio_test_swapbacked(folio)) - return 1; -#endif - /* * If unmap fails, we need to restore the ptes. To avoid accidentally * upgrading write permissions for ptes that were not originally @@ -2183,8 +2179,7 @@ static bool __ttu_anon_swapbacked_folio(struct vm_area_struct *vma, * architectures where we could have PFN swap PTEs, * so we'll not check/care. */ - if (arch_unmap_one(mm, vma, address, pteval) < 0) { - VM_WARN_ON(nr_pages != 1); + if (arch_unmap_one(mm, vma, address, pteval, nr_pages) < 0) { folio_put_swap_pages(folio, page, nr_pages); return false; } @@ -2753,7 +2748,7 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma, * architectures where we could have PFN swap PTEs, * so we'll not check/care. */ - if (arch_unmap_one(mm, vma, address, pteval) < 0) { + if (arch_unmap_one(mm, vma, address, pteval, 1) < 0) { if (folio_test_hugetlb(folio)) set_huge_pte_at(mm, address, pvmw.pte, pteval, hsz); -- 2.43.0