kernel/linux.git/arch/nios2/mm/init.c, branch linux-7.1.y

arch, mm: consolidate initialization of nodes, zones and memory map

2026-01-27T04:02:18+00:00

To initialize node, zone and memory map data structures every architecture calls free_area_init() during setup_arch() and passes it an array of zone limits. Beside code duplication it creates "interesting" ordering cases between allocation and initialization of hugetlb and the memory map. Some architectures allocate hugetlb pages very early in setup_arch() in certain cases, some only create hugetlb CMA areas in setup_arch() and sometimes hugetlb allocations happen mm_core_init(). With arch_zone_limits_init() helper available now on all architectures it is no longer necessary to call free_area_init() from architecture setup code. Rather core MM initialization can call arch_zone_limits_init() in a single place. This allows to unify ordering of hugetlb vs memory map allocation and initialization. Remove the call to free_area_init() from architecture specific code and place it in a new mm_core_init_early() function that is called immediately after setup_arch(). After this refactoring it is possible to consolidate hugetlb allocations and eliminate differences in ordering of hugetlb and memory map initialization among different architectures. As the first step of this consolidation move hugetlb_bootmem_alloc() to mm_core_early_init(). Link: https://lkml.kernel.org/r/20260111082105.290734-24-rppt@kernel.org Signed-off-by: Mike Rapoport (Microsoft) Cc: Alexander Gordeev Cc: Alex Shi Cc: Andreas Larsson Cc: "Borislav Petkov (AMD)" Cc: Catalin Marinas Cc: David Hildenbrand Cc: David S. Miller Cc: Dinh Nguyen Cc: Geert Uytterhoeven Cc: Guo Ren Cc: Heiko Carstens Cc: Helge Deller Cc: Huacai Chen Cc: Ingo Molnar Cc: Johannes Berg Cc: John Paul Adrian Glaubitz Cc: Jonathan Corbet Cc: Klara Modin Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Magnus Lindholm Cc: Matt Turner Cc: Max Filippov Cc: Michael Ellerman Cc: Michal Hocko Cc: Michal Simek Cc: Muchun Song Cc: Oscar Salvador Cc: Palmer Dabbelt Cc: Pratyush Yadav Cc: Richard Weinberger Cc: "Ritesh Harjani (IBM)" Cc: Russell King Cc: Stafford Horne Cc: Suren Baghdasaryan Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Vineet Gupta Cc: Vlastimil Babka Cc: Will Deacon Signed-off-by: Andrew Morton

nios2: introduce arch_zone_limits_init()

2026-01-27T04:02:15+00:00

Move calculations of zone limits to a dedicated arch_zone_limits_init() function. Later MM core will use this function as an architecture specific callback during nodes and zones initialization and thus there won't be a need to call free_area_init() from every architecture. Link: https://lkml.kernel.org/r/20260111082105.290734-13-rppt@kernel.org Signed-off-by: Mike Rapoport (Microsoft) Acked-by: Dinh Nguyen Cc: Alexander Gordeev Cc: Alex Shi Cc: Andreas Larsson Cc: "Borislav Petkov (AMD)" Cc: Catalin Marinas Cc: David Hildenbrand Cc: David S. Miller Cc: Geert Uytterhoeven Cc: Guo Ren Cc: Heiko Carstens Cc: Helge Deller Cc: Huacai Chen Cc: Ingo Molnar Cc: Johannes Berg Cc: John Paul Adrian Glaubitz Cc: Jonathan Corbet Cc: Klara Modin Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Magnus Lindholm Cc: Matt Turner Cc: Max Filippov Cc: Michael Ellerman Cc: Michal Hocko Cc: Michal Simek Cc: Muchun Song Cc: Oscar Salvador Cc: Palmer Dabbelt Cc: Pratyush Yadav Cc: Richard Weinberger Cc: "Ritesh Harjani (IBM)" Cc: Russell King Cc: Stafford Horne Cc: Suren Baghdasaryan Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Vineet Gupta Cc: Vlastimil Babka Cc: Will Deacon Signed-off-by: Andrew Morton

arch, mm: make releasing of memory to page allocator more explicit

2025-03-18T05:06:53+00:00

The point where the memory is released from memblock to the buddy allocator is hidden inside arch-specific mem_init()s and the call to memblock_free_all() is needlessly duplicated in every artiste cure and after introduction of arch_mm_preinit() hook, mem_init() implementation on many architecture only contains the call to memblock_free_all(). Pull memblock_free_all() call into mm_core_init() and drop mem_init() on relevant architectures to make it more explicit where the free memory is released from memblock to the buddy allocator and to reduce code duplication in architecture specific code. Link: https://lkml.kernel.org/r/20250313135003.836600-14-rppt@kernel.org Signed-off-by: Mike Rapoport (Microsoft) Acked-by: Dave Hansen [x86] Acked-by: Geert Uytterhoeven [m68k] Tested-by: Mark Brown Cc: Alexander Gordeev Cc: Andreas Larsson Cc: Andy Lutomirski Cc: Ard Biesheuvel Cc: Arnd Bergmann Cc: Borislav Betkov Cc: Catalin Marinas Cc: David S. Miller Cc: Dinh Nguyen Cc: Gerald Schaefer Cc: Guo Ren (csky) Cc: Heiko Carstens Cc: Helge Deller Cc: Huacai Chen Cc: Ingo Molnar Cc: Jiaxun Yang Cc: Johannes Berg Cc: John Paul Adrian Glaubitz Cc: Madhavan Srinivasan Cc: Matt Turner Cc: Max Filippov Cc: Michael Ellerman Cc: Michal Simek Cc: Palmer Dabbelt Cc: Richard Weinberger Cc: Russel King Cc: Stafford Horne Cc: Thomas Bogendoerfer Cc: Thomas Gleinxer Cc: Vasily Gorbik Cc: Vineet Gupta Cc: Will Deacon Signed-off-by: Andrew Morton

arch, mm: set high_memory in free_area_init()

2025-03-18T05:06:52+00:00

high_memory defines upper bound on the directly mapped memory. This bound is defined by the beginning of ZONE_HIGHMEM when a system has high memory and by the end of memory otherwise. All this is known to generic memory management initialization code that can set high_memory while initializing core mm structures. Add a generic calculation of high_memory to free_area_init() and remove per-architecture calculation except for the architectures that set and use high_memory earlier than that. Link: https://lkml.kernel.org/r/20250313135003.836600-11-rppt@kernel.org Signed-off-by: Mike Rapoport (Microsoft) Acked-by: Dave Hansen [x86] Tested-by: Mark Brown Cc: Alexander Gordeev Cc: Andreas Larsson Cc: Andy Lutomirski Cc: Ard Biesheuvel Cc: Arnd Bergmann Cc: Borislav Betkov Cc: Catalin Marinas Cc: David S. Miller Cc: Dinh Nguyen Cc: Geert Uytterhoeven Cc: Gerald Schaefer Cc: Guo Ren (csky) Cc: Heiko Carstens Cc: Helge Deller Cc: Huacai Chen Cc: Ingo Molnar Cc: Jiaxun Yang Cc: Johannes Berg Cc: John Paul Adrian Glaubitz Cc: Madhavan Srinivasan Cc: Matt Turner Cc: Max Filippov Cc: Michael Ellerman Cc: Michal Simek Cc: Palmer Dabbelt Cc: Richard Weinberger Cc: Russel King Cc: Stafford Horne Cc: Thomas Bogendoerfer Cc: Thomas Gleinxer Cc: Vasily Gorbik Cc: Vineet Gupta Cc: Will Deacon Signed-off-by: Andrew Morton

arch, mm: set max_mapnr when allocating memory map for FLATMEM

2025-03-18T05:06:52+00:00

max_mapnr is essentially the size of the memory map for systems that use FLATMEM. There is no reason to calculate it in each and every architecture when it's anyway calculated in alloc_node_mem_map(). Drop setting of max_mapnr from architecture code and set it once in alloc_node_mem_map(). While on it, move definition of mem_map and max_mapnr to mm/mm_init.c so there won't be two copies for MMU and !MMU variants. Link: https://lkml.kernel.org/r/20250313135003.836600-10-rppt@kernel.org Signed-off-by: Mike Rapoport (Microsoft) Acked-by: Dave Hansen [x86] Tested-by: Mark Brown Cc: Alexander Gordeev Cc: Andreas Larsson Cc: Andy Lutomirski Cc: Ard Biesheuvel Cc: Arnd Bergmann Cc: Borislav Betkov Cc: Catalin Marinas Cc: David S. Miller Cc: Dinh Nguyen Cc: Geert Uytterhoeven Cc: Gerald Schaefer Cc: Guo Ren (csky) Cc: Heiko Carstens Cc: Helge Deller Cc: Huacai Chen Cc: Ingo Molnar Cc: Jiaxun Yang Cc: Johannes Berg Cc: John Paul Adrian Glaubitz Cc: Madhavan Srinivasan Cc: Matt Turner Cc: Max Filippov Cc: Michael Ellerman Cc: Michal Simek Cc: Palmer Dabbelt Cc: Richard Weinberger Cc: Russel King Cc: Stafford Horne Cc: Thomas Bogendoerfer Cc: Thomas Gleinxer Cc: Vasily Gorbik Cc: Vineet Gupta Cc: Will Deacon Signed-off-by: Andrew Morton

nios2: move pr_debug() about memory start and end to setup_arch()

2025-03-18T05:06:51+00:00

This will help with pulling out memblock_free_all() to the generic code and reducing code duplication in arch::mem_init(). Link: https://lkml.kernel.org/r/20250313135003.836600-7-rppt@kernel.org Signed-off-by: Mike Rapoport (Microsoft) Cc: Alexander Gordeev Cc: Andreas Larsson Cc: Andy Lutomirski Cc: Ard Biesheuvel Cc: Arnd Bergmann Cc: Borislav Betkov Cc: Catalin Marinas Cc: Dave Hansen Cc: David S. Miller Cc: Dinh Nguyen Cc: Geert Uytterhoeven Cc: Gerald Schaefer Cc: Guo Ren (csky) Cc: Heiko Carstens Cc: Helge Deller Cc: Huacai Chen Cc: Ingo Molnar Cc: Jiaxun Yang Cc: Johannes Berg Cc: John Paul Adrian Glaubitz Cc: Madhavan Srinivasan Cc: Mark Brown Cc: Matt Turner Cc: Max Filippov Cc: Michael Ellerman Cc: Michal Simek Cc: Palmer Dabbelt Cc: Richard Weinberger Cc: Russel King Cc: Stafford Horne Cc: Thomas Bogendoerfer Cc: Thomas Gleinxer Cc: Vasily Gorbik Cc: Vineet Gupta Cc: Will Deacon Signed-off-by: Andrew Morton

mm: remove legacy install_special_mapping() code

2024-09-02T03:26:13+00:00

All relevant architectures had already been converted to the new interface (which just has an underscore in front of the name - not very imaginative naming), this just force-converts the stragglers. The modern interface is almost identical to the old one, except instead of the page pointer it takes a "struct vm_special_mapping" that describes the mapping (and contains the page pointer as one member), and it returns the resulting 'vma' instead of just the error code. Getting rid of the old interface also gets rid of some special casing, which had caused problems with the mremap extensions to "struct vm_special_mapping". [akpm@linux-foundation.org: coding-style cleanups] Link: https://lkml.kernel.org/r/CAHk-=whvR+z=0=0gzgdfUiK70JTa-=+9vxD-4T=3BagXR6dciA@mail.gmail.comTested-by: Rob Landley # arch/sh/ Link: https://lore.kernel.org/all/20240819195120.GA1113263@thelio-3990X/ Signed-off-by: Linus Torvalds Cc: Nathan Chancellor Cc: Michael Ellerman Cc: Anton Ivanov Cc: Brian Cain Cc: Christophe Leroy Cc: Dinh Nguyen Cc: Guo Ren Cc: Jeff Xu Cc: Johannes Berg Cc: John Paul Adrian Glaubitz Cc: Liam R. Howlett Cc: Nicholas Piggin Cc: Pedro Falcato Cc: Richard Weinberger Cc: Rich Felker Cc: Rob Landley Cc: Yoshinori Sato Signed-off-by: Andrew Morton

arch: make execmem setup available regardless of CONFIG_MODULES

2024-05-14T07:31:44+00:00

execmem does not depend on modules, on the contrary modules use execmem. To make execmem available when CONFIG_MODULES=n, for instance for kprobes, split execmem_params initialization out from arch/*/kernel/module.c and compile it when CONFIG_EXECMEM=y Signed-off-by: Mike Rapoport (IBM) Reviewed-by: Philippe Mathieu-Daudé Signed-off-by: Luis Chamberlain

nios2: drop definition of PGD_ORDER

2022-07-18T00:14:43+00:00

This is the order of the page table allocation, not the order of a PGD. Since its always hardwired to 0, simply drop it. Link: https://lkml.kernel.org/r/20220703141203.147893-9-rppt@kernel.org Signed-off-by: Mike Rapoport Acked-by: Dinh Nguyen Cc: Arnd Bergmann Cc: Guo Ren Cc: Helge Deller Cc: Huacai Chen Cc: James Bottomley Cc: "Matthew Wilcox (Oracle)" Cc: Max Filippov Cc: Thomas Bogendoerfer Cc: Xuerui Wang Signed-off-by: Andrew Morton

nios2: drop definition of PTE_ORDER

2022-07-18T00:14:42+00:00

This is the order of the page table allocation, not the order of a PTE. Since its always hardwired to 0, simply drop it. Link: https://lkml.kernel.org/r/20220703141203.147893-8-rppt@kernel.org Signed-off-by: Mike Rapoport Acked-by: Dinh Nguyen Cc: Arnd Bergmann Cc: Guo Ren Cc: Helge Deller Cc: Huacai Chen Cc: James Bottomley Cc: "Matthew Wilcox (Oracle)" Cc: Max Filippov Cc: Thomas Bogendoerfer Cc: Xuerui Wang Signed-off-by: Andrew Morton