From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794034439; b=KyNb9xcasoh4oQm53ZehUFcG0A1hT1HaZIQeCKTAkXQjk9f5X4xxkEEAukvb16A6BX4N mdRgNIvdEq7ZSd6GXlgD7WWWRObF7idA8e1phLpw9qvN3deOsRjxgX0ynreGIB3pKU70q UUfrrXwnJhr5y9TCOpK8DocW3//NZrvr1YpsgL5L6psuYekJfpUCXnEenK8yAK8NTsPSh fAaf8DqODzlAGyqy2w+ozdsJmjhqwSBLke+xRJDRkp2hXUS2jchYnGjTzVTZeF7gb58TR EaQTGJKtkTJ3rxa0gXde6i/5xhvAFiznAPt9rydlf2idgsyEnZ1zE8hZEwjbBpVEYag== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794034439; h=Received:DKIM-Signature:Date:To:From:Subject:Message-Id; bh=N+SKmYa/90KYEhIUYYr4bjcjtYuCagVo6ezbU8wsG+E=; b=MQulOQm+mZZQK+870XLC0zyS/tyM1ebDtNRv095c6UVtvnNZ0FOsuvd2V7SdFM2cbw4O WRO9MxhWL7Qf8YiQKtAsulnJPbQndSSBwyiqiRLKrusCbtBrO5ZmB1lUUaL99p2z0QY3j ksakNremmMxnOA3mEvvuDFAuygZnZzc2EeHAyxAMi6Ce9yWJEEPpWNDhwB+iSgOrZehTZ kHmrJ8SI4KL369zV7gxkg/Vqc4sDesJVjeFLnt5ASh11XYhlPG1QAEbI7L9hm4VMII+Fq 9vWzo1yCLx8Sz7u9d2oQaY5bq4ARMEcUbzB9LgUyGC3nfp3vOiM8Lp9GTuONeCbGgLg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linux-foundation.org header.i=@linux-foundation.org header.a=rsa-sha256 header.s=korg header.b=MITg27h6; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5BB4B606A326 for ; Sat, 7 Nov 2026 06:53:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.a=rsa-sha256 header.s=korg header.b=MITg27h6 Received: by smtp.kernel.org (Postfix) with ESMTPSA id C8CC31F0089F; Sat, 7 Nov 2026 06:53:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1794034438; bh=N+SKmYa/90KYEhIUYYr4bjcjtYuCagVo6ezbU8wsG+E=; h=Date:To:From:Subject; b=MITg27h6cBTlbyLu24Fj63m223Fujhux62u2xg2IIC6tCHpa/Ek++jT50FbO+S6Sz cd4D5IBk+uyOnq5oHut9SCzWraZ4UWaDGAyq2ZPWbrSNZYIp5OzEG+tdhuG9z8da4T oPRFxh/g9+UR49USR0nBco60LF+Gp19Y7TIC+TOg= Date: Fri, 06 Nov 2026 22:53:58 -0800 To: mm-commits@vger.kernel.org,sshegde@linux.ibm.com,rppt@kernel.org, ritesh.list@gmail.com,qi.zheng@linux.dev,osalvador@suse.de,npiggin@gmail.com, mpe@ellerman.id.au,maddy@linux.ibm.com,lance.yang@linux.dev, kernel@xen0n.name,david@kernel.org,chleroy@kernel.org,chenhuacai@kernel.org, muchun.song@linux.dev,akpm@linux-foundation.org From: Andrew Morton Subject: + powerpc-mm-drop-powerpc-vmemmap_can_optimize.patch added to mm-new branch Message-Id: <20261107065358.C8CC31F0089F@smtp.kernel.org> X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list The patch titled Subject: powerpc/mm: drop powerpc vmemmap_can_optimize() has been added to the -mm mm-new branch. Its filename is powerpc-mm-drop-powerpc-vmemmap_can_optimize.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/powerpc-mm-drop-powerpc-vmemmap_can_optimize.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is included in linux-next Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Muchun Song Subject: powerpc/mm: drop powerpc vmemmap_can_optimize() Date: Sat, 07 Nov 2026 12:31:19 +0800 Whether the optimized mapping can be used is now decided in the architecture-specific vmemmap_populate() path. When PowerPC has to fall back, such as on Hash MMU, it can disable optimization for the populated vmemmap range there. Add section_vmemmap_optimization_disable() to centralize this fallback, use it in the Hash MMU path, and drop the radix-specific vmemmap_can_optimize() override. Link: https://lore.kernel.org/20261107043122.25650-3-songmuchun@bytedance.com Signed-off-by: Muchun Song Signed-off-by: Andrew Morton Cc: David Hildenbrand Cc: Madhavan Srinivasan Cc: Mike Rapoport Cc: Lance Yang Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Christophe Leroy Cc: Ritesh Harjani (IBM) Cc: Shrikanth Hegde Cc: Oscar Salvador Cc: Qi Zheng Cc: Huacai Chen Cc: WANG Xuerui --- arch/powerpc/include/asm/book3s/64/radix.h | 5 ----- arch/powerpc/mm/book3s64/radix_pgtable.c | 10 ---------- arch/powerpc/mm/init_64.c | 2 ++ include/linux/vmemmap-optimization.h | 6 ++++++ mm/sparse-vmemmap.c | 17 +++++++++++++++++ 5 files changed, 25 insertions(+), 15 deletions(-) --- a/arch/powerpc/include/asm/book3s/64/radix.h~powerpc-mm-drop-powerpc-vmemmap_can_optimize +++ a/arch/powerpc/include/asm/book3s/64/radix.h @@ -351,10 +351,5 @@ int radix__create_section_mapping(unsign int nid, pgprot_t prot); int radix__remove_section_mapping(unsigned long start, unsigned long end); #endif /* CONFIG_MEMORY_HOTPLUG */ - -#ifdef CONFIG_ARCH_WANT_OPTIMIZE_DAX_VMEMMAP -#define vmemmap_can_optimize vmemmap_can_optimize -bool vmemmap_can_optimize(struct vmem_altmap *altmap, struct dev_pagemap *pgmap); -#endif #endif /* __ASSEMBLER__ */ #endif --- a/arch/powerpc/mm/book3s64/radix_pgtable.c~powerpc-mm-drop-powerpc-vmemmap_can_optimize +++ a/arch/powerpc/mm/book3s64/radix_pgtable.c @@ -978,16 +978,6 @@ int __meminit radix__vmemmap_create_mapp return 0; } -#ifdef CONFIG_ARCH_WANT_OPTIMIZE_DAX_VMEMMAP -bool vmemmap_can_optimize(struct vmem_altmap *altmap, struct dev_pagemap *pgmap) -{ - if (radix_enabled()) - return __vmemmap_can_optimize(altmap, pgmap); - - return false; -} -#endif - int __meminit vmemmap_check_pmd(pmd_t *pmdp, int node, unsigned long addr, unsigned long next) { --- a/arch/powerpc/mm/init_64.c~powerpc-mm-drop-powerpc-vmemmap_can_optimize +++ a/arch/powerpc/mm/init_64.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include #include @@ -281,6 +282,7 @@ int __meminit vmemmap_populate(unsigned if (radix_enabled()) return radix__vmemmap_populate(start, end, node, altmap); #endif + section_vmemmap_optimization_disable(start, end); return __vmemmap_populate(start, end, node, altmap); } --- a/include/linux/vmemmap-optimization.h~powerpc-mm-drop-powerpc-vmemmap_can_optimize +++ a/include/linux/vmemmap-optimization.h @@ -63,6 +63,7 @@ static inline unsigned int pfn_to_sectio } struct page *vmemmap_shared_tail_page(unsigned int order, struct zone *zone); +void section_vmemmap_optimization_disable(unsigned long start, unsigned long end); #else static inline unsigned int section_compound_order(const struct mem_section *section) { @@ -79,6 +80,11 @@ static inline void section_set_compound_ { } +static inline void section_vmemmap_optimization_disable(unsigned long start, + unsigned long end) +{ +} + static inline unsigned int pfn_to_section_compound_order(unsigned long pfn) { return 0; --- a/mm/sparse-vmemmap.c~powerpc-mm-drop-powerpc-vmemmap_can_optimize +++ a/mm/sparse-vmemmap.c @@ -232,6 +232,23 @@ struct page __ref *vmemmap_shared_tail_p return page; } + +void __meminit section_vmemmap_optimization_disable(unsigned long start, + unsigned long end) +{ + unsigned long pfn = page_to_pfn((struct page *)start); + unsigned long nr_pages = (end - start) / sizeof(struct page); + struct mem_section *section = __pfn_to_section(pfn); + + if (nr_pages < PAGES_PER_SECTION) { + VM_WARN_ON_ONCE(section_vmemmap_optimizable(section)); + return; + } + + VM_WARN_ON_ONCE(!IS_ALIGNED(pfn, PAGES_PER_SECTION)); + VM_WARN_ON_ONCE(nr_pages != PAGES_PER_SECTION); + section_set_compound_order(section, 0); +} #endif static __meminit void *vmemmap_alloc_pte(unsigned long pfn, int node, _ Patches currently in -mm which might be from muchun.song@linux.dev are mm-fix-missing-page-table-destructor-in-pagetable_free.patch riscv-mm-fix-hotplug-page-table-destructor-handling.patch riscv-mm-fix-missing-destructor-for-hotplug-pud-tables.patch arm64-mm-fix-destructor-for-unconstructed-hotplug-page-tables.patch mm-sparse-vmemmap-map-shared-vmemmap-tail-pages-as-read-only.patch powerpc-mm-map-shared-vmemmap-tail-pages-as-read-only.patch mm-hugetlb_vmemmap-remove-vmemmap_wrprotect_hvo.patch mm-hugetlb_vmemmap-remove-hugetlb_vmemmap_optimize_bootmem_folios.patch mm-generalize-kernel-pte-table-allocation.patch mm-generalize-pmd-page-table-allocation.patch mm-generalize-pud-page-table-allocation.patch mm-remove-pagetable_dtor_free.patch mm-remove-redundant-pagetable_dtor-calls.patch mm-hugetlb_vmemmap-remove-hugetlb-specific-vmemmap-optimization-macros.patch mm-hugetlb_vmemmap-unify-vmemmap_splitremap_no_tlb_flush.patch mm-hugetlb_vmemmap-simplify-vmemmap-head-page-handling.patch mm-hugetlb_vmemmap-generalize-vmemmap-page-allocation.patch mm-hugetlb_vmemmap-unify-writable-vmemmap-page-preparation.patch mm-hugetlb_vmemmap-rename-vmemmap_remap_pte-to-vmemmap_optimize_pte.patch mm-hugetlb_vmemmap-simplify-shared-tail-page-handling.patch mm-hugetlb_vmemmap-move-alloc_vmemmap_page_list-next-to-its-free-helper.patch mm-hugetlb_vmemmap-make-vmemmap-optimization-folio-oriented.patch mm-hugetlb_vmemmap-make-vmemmap-restoration-folio-oriented.patch mm-hugetlb_vmemmap-unify-vmemmap-range-restoration.patch mm-hugetlb_vmemmap-make-vmemmap-pte-conversion-folio-oriented.patch mm-hugetlb-fix-validation-of-unsupported-hugetlb-orders.patch powerpc-mm-make-vmemmap_populate_compound_pages-static.patch powerpc-mm-drop-powerpc-vmemmap_can_optimize.patch loongarch-mm-disable-device-dax-vmemmap-optimization.patch mm-sparse-vmemmap-drop-vmemmap_can_optimize.patch mm-sparse-vmemmap-drop-pgmap-from-vmemmap-population-apis.patch