kernel/linux.git/arch/mips/mm/pgtable.c, branch linux-7.0.y

asm-generic: pgalloc: provide generic __pgd_{alloc,free}

2025-01-26T04:22:24+00:00

We already have a generic implementation of alloc/free up to P4D level, as well as pgd_free(). Let's finish the work and add a generic PGD-level alloc helper as well. Unlike at lower levels, almost all architectures need some specific magic at PGD level (typically initialising PGD entries), so introducing a generic pgd_alloc() isn't worth it. Instead we introduce two new helpers, __pgd_alloc() and __pgd_free(), and make use of them in the arch-specific pgd_alloc() and pgd_free() wherever possible. To accommodate as many arch as possible, __pgd_alloc() takes a page allocation order. Because pagetable_alloc() allocates zeroed pages, explicit zeroing in pgd_alloc() becomes redundant and we can get rid of it. Some trivial implementations of pgd_free() also become unnecessary once __pgd_alloc() is used; remove them. Another small improvement is consistent accounting of PGD pages by using GFP_PGTABLE_{USER,KERNEL} as appropriate. Not all PGD allocations can be handled by the generic helpers. In particular, multiple architectures allocate PGDs from a kmem_cache, and those PGDs may not be page-sized. Link: https://lkml.kernel.org/r/20250103184415.2744423-6-kevin.brodsky@arm.com Signed-off-by: Kevin Brodsky Acked-by: Dave Hansen Acked-by: Qi Zheng Cc: Andy Lutomirski Cc: Catalin Marinas Cc: Ingo Molnar Cc: Linus Walleij Cc: Matthew Wilcox (Oracle) Cc: Mike Rapoport (Microsoft) Cc: Peter Zijlstra Cc: Ryan Roberts Cc: Thomas Gleixner Cc: Will Deacon Signed-off-by: Andrew Morton

mips: convert various functions to use ptdescs

2023-08-21T20:37:56+00:00

As part of the conversions to replace pgtable constructor/destructors with ptdesc equivalents, convert various page table functions to use ptdescs. Some of the functions use the *get*page*() helper functions. Convert these to use pagetable_alloc() and ptdesc_address() instead to help standardize page tables further. Link: https://lkml.kernel.org/r/20230807230513.102486-24-vishal.moola@gmail.com Signed-off-by: Vishal Moola (Oracle) Acked-by: Mike Rapoport (IBM) Cc: Arnd Bergmann Cc: Catalin Marinas Cc: Christophe Leroy Cc: Claudio Imbrenda Cc: Dave Hansen Cc: David Hildenbrand Cc: "David S. Miller" Cc: Dinh Nguyen Cc: Geert Uytterhoeven Cc: Geert Uytterhoeven Cc: Guo Ren Cc: Huacai Chen Cc: Hugh Dickins Cc: John Paul Adrian Glaubitz Cc: Jonas Bonn Cc: Matthew Wilcox Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Richard Weinberger Cc: Thomas Bogendoerfer Cc: Yoshinori Sato Signed-off-by: Andrew Morton

MIPS&LoongArch&NIOS2: adjust prototypes of p?d_init()

2022-12-12T02:12:11+00:00

Patch series "mm/sparse-vmemmap: Generalise helpers and enable for LoongArch", v14. This series is in order to enable sparse-vmemmap for LoongArch. But LoongArch cannot use generic helpers directly because MIPS&LoongArch need to call pgd_init()/pud_init()/pmd_init() when populating page tables. So we adjust the prototypes of p?d_init() to make generic helpers can call them, then enable sparse-vmemmap with generic helpers, and to be further, generalise vmemmap_populate_hugepages() for ARM64, X86 and LoongArch. This patch (of 4): We are preparing to add sparse vmemmap support to LoongArch. MIPS and LoongArch need to call pgd_init()/pud_init()/pmd_init() when populating page tables, so adjust their prototypes to make generic helpers can call them. NIOS2 declares pmd_init() but doesn't use, just remove it to avoid build errors. Link: https://lkml.kernel.org/r/20221027125253.3458989-1-chenhuacai@loongson.cn Link: https://lkml.kernel.org/r/20221027125253.3458989-2-chenhuacai@loongson.cn Signed-off-by: Feiyang Chen Signed-off-by: Huacai Chen Reviewed-by: Jiaxun Yang Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Arnd Bergmann Cc: Andy Lutomirski Cc: Catalin Marinas Cc: Dave Hansen Cc: Dinh Nguyen Cc: Guo Ren Cc: Peter Zijlstra Cc: Thomas Bogendoerfer Cc: Will Deacon Cc: Xuefeng Li Cc: Xuerui Wang Cc: Min Zhou Cc: Muchun Song Signed-off-by: Andrew Morton

mips: rename PGD_ORDER to PGD_TABLE_ORDER

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

This is the order of the page table allocation, not the order of a PGD. While at it remove unused defintion of _PGD_ORDER in asm-offsets. Link: https://lkml.kernel.org/r/20220703141203.147893-7-rppt@kernel.org Signed-off-by: Mike Rapoport Cc: Arnd Bergmann Cc: Dinh Nguyen 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

MIPS: Move pgd_alloc() out of header

2017-02-02T15:06:26+00:00

pgd_alloc() references init_mm which is not exported to modules. In order for KVM to be able to use pgd_alloc() to allocate GVA page tables, move pgd_alloc() into a new pgtable.c file and export it to modules. Signed-off-by: James Hogan Acked-by: Ralf Baechle Cc: Ralf Baechle Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org

mips: use generic show_mem()

2008-07-26T19:00:11+00:00

Remove arch-specific show_mem() in favor of the generic version. This also removes the following redundant information display: - pages in swapcache, printed by show_swap_cache_info() where show_mem() calls show_free_areas(), which calls show_swap_cache_info(). And show_mem() does now actually print something on configurations with multiple nodes. Signed-off-by: Johannes Weiner Acked-by: Ralf Baechle Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[MIPS] remove redundant display of free swap space in show_mem()

2008-04-28T16:14:27+00:00

Signed-off-by: Johannes Weiner Signed-off-by: Andrew Morton Signed-off-by: Ralf Baechle

[MIPS] checkfiles: Fix "need space after that ','" errors.

2007-10-11T22:46:15+00:00

Signed-off-by: Ralf Baechle

[MIPS] sparsemem: fix crash in show_mem

2006-07-13T20:26:22+00:00

With sparsemem, pfn should be checked by pfn_valid() before pfn_to_page(). Signed-off-by: Atsushi Nemoto Signed-off-by: Ralf Baechle

Remove obsolete #include

2006-06-30T17:25:36+00:00

Signed-off-by: Jörn Engel Signed-off-by: Adrian Bunk