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6215d9f447
Reduce 22 declarations of empty_zero_page to 3 and 23 declarations of ZERO_PAGE() to 4. Every architecture defines empty_zero_page that way or another, but for the most of them it is always a page aligned page in BSS and most definitions of ZERO_PAGE do virt_to_page(empty_zero_page). Move Linus vetted x86 definition of empty_zero_page and ZERO_PAGE() to the core MM and drop these definitions in architectures that do not implement colored zero page (MIPS and s390). ZERO_PAGE() remains a macro because turning it to a wrapper for a static inline causes severe pain in header dependencies. For the most part the change is mechanical, with these being noteworthy: * alpha: aliased empty_zero_page with ZERO_PGE that was also used for boot parameters. Switching to a generic empty_zero_page removes the aliasing and keeps ZERO_PGE for boot parameters only * arm64: uses __pa_symbol() in ZERO_PAGE() so that definition of ZERO_PAGE() is kept intact. * m68k/parisc/um: allocated empty_zero_page from memblock, although they do not support zero page coloring and having it in BSS will work fine. * sparc64 can have empty_zero_page in BSS rather allocate it, but it can't use virt_to_page() for BSS. Keep it's definition of ZERO_PAGE() but instead of allocating it, make mem_map_zero point to empty_zero_page. * sh: used empty_zero_page for boot parameters at the very early boot. Rename the parameters page to boot_params_page and let sh use the generic empty_zero_page. * hexagon: had an amusing comment about empty_zero_page /* A handy thing to have if one has the RAM. Declared in head.S */ that unfortunately had to go :) Link: https://lkml.kernel.org/r/20260211103141.3215197-4-rppt@kernel.org Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Acked-by: Helge Deller <deller@gmx.de> [parisc] Tested-by: Helge Deller <deller@gmx.de> [parisc] Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org> Acked-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Magnus Lindholm <linmag7@gmail.com> [alpha] Acked-by: Dinh Nguyen <dinguyen@kernel.org> [nios2] Acked-by: Andreas Larsson <andreas@gaisler.com> [sparc] Acked-by: David Hildenbrand (Arm) <david@kernel.org> Acked-by: Liam R. Howlett <Liam.Howlett@oracle.com> Cc: "Borislav Petkov (AMD)" <bp@alien8.de> Cc: David S. Miller <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Guo Ren <guoren@kernel.org> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Hocko <mhocko@suse.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Richard Weinberger <richard@nod.at> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vineet Gupta <vgupta@kernel.org> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
119 lines
2.5 KiB
C
119 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/m68k/mm/init.c
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*
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* Copyright (C) 1995 Hamish Macdonald
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*
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* Contains common initialization routines, specific init code moved
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* to motorola.c and sun3mmu.c
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*/
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#include <linux/module.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/memblock.h>
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#include <linux/gfp.h>
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#include <asm/setup.h>
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#include <linux/uaccess.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm/traps.h>
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#include <asm/machdep.h>
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#include <asm/io.h>
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#ifdef CONFIG_ATARI
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#include <asm/atari_stram.h>
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#endif
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#include <asm/sections.h>
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#include <asm/tlb.h>
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void __init arch_zone_limits_init(unsigned long *max_zone_pfns)
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{
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max_zone_pfns[ZONE_DMA] = PFN_DOWN(memblock_end_of_DRAM());
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}
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#ifdef CONFIG_MMU
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int m68k_virt_to_node_shift;
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void __init m68k_setup_node(int node)
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{
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node_set_online(node);
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}
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#else /* CONFIG_MMU */
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/*
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* paging_init() continues the virtual memory environment setup which
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* was begun by the code in arch/head.S.
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* The parameters are pointers to where to stick the starting and ending
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* addresses of available kernel virtual memory.
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*/
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void __init paging_init(void)
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{
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/*
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* Make sure start_mem is page aligned, otherwise bootmem and
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* page_alloc get different views of the world.
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*/
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unsigned long end_mem = memory_end & PAGE_MASK;
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high_memory = (void *) end_mem;
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}
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#endif /* CONFIG_MMU */
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void free_initmem(void)
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{
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#ifndef CONFIG_MMU_SUN3
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free_initmem_default(-1);
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#endif /* CONFIG_MMU_SUN3 */
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}
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#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
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#define VECTORS &vectors[0]
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#else
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#define VECTORS _ramvec
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#endif
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static inline void init_pointer_tables(void)
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{
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#if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
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int i, j;
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/* insert pointer tables allocated so far into the tablelist */
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init_pointer_table(kernel_pg_dir, TABLE_PGD);
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for (i = 0; i < PTRS_PER_PGD; i++) {
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pud_t *pud = (pud_t *)&kernel_pg_dir[i];
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pmd_t *pmd_dir;
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if (!pud_present(*pud))
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continue;
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pmd_dir = (pmd_t *)pgd_page_vaddr(kernel_pg_dir[i]);
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init_pointer_table(pmd_dir, TABLE_PMD);
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for (j = 0; j < PTRS_PER_PMD; j++) {
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pmd_t *pmd = &pmd_dir[j];
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pte_t *pte_dir;
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if (!pmd_present(*pmd))
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continue;
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pte_dir = (pte_t *)pmd_page_vaddr(*pmd);
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init_pointer_table(pte_dir, TABLE_PTE);
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}
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}
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#endif
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}
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void __init mem_init(void)
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{
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init_pointer_tables();
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}
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