mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-10-30 22:03:17 +01:00
Mike Rapoport (Microsoft)
8268af309d
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/[email protected] Signed-off-by: Mike Rapoport (Microsoft) <[email protected]> Acked-by: Dave Hansen <[email protected]> [x86] Tested-by: Mark Brown <[email protected]> Cc: Alexander Gordeev <[email protected]> Cc: Andreas Larsson <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Ard Biesheuvel <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Borislav Betkov <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: David S. Miller <[email protected]> Cc: Dinh Nguyen <[email protected]> Cc: Geert Uytterhoeven <[email protected]> Cc: Gerald Schaefer <[email protected]> Cc: Guo Ren (csky) <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: Helge Deller <[email protected]> Cc: Huacai Chen <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Jiaxun Yang <[email protected]> Cc: Johannes Berg <[email protected]> Cc: John Paul Adrian Glaubitz <[email protected]> Cc: Madhavan Srinivasan <[email protected]> Cc: Matt Turner <[email protected]> Cc: Max Filippov <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Michal Simek <[email protected]> Cc: Palmer Dabbelt <[email protected]> Cc: Richard Weinberger <[email protected]> Cc: Russel King <[email protected]> Cc: Stafford Horne <[email protected]> Cc: Thomas Bogendoerfer <[email protected]> Cc: Thomas Gleinxer <[email protected]> Cc: Vasily Gorbik <[email protected]> Cc: Vineet Gupta <[email protected]> Cc: Will Deacon <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_MEMORY_MODEL_H
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#define __ASM_MEMORY_MODEL_H
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#include <linux/pfn.h>
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#ifndef __ASSEMBLY__
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/*
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* supports 3 memory models.
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*/
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#if defined(CONFIG_FLATMEM)
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#ifndef ARCH_PFN_OFFSET
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#define ARCH_PFN_OFFSET (0UL)
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#endif
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#define __pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET))
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#define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + \
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ARCH_PFN_OFFSET)
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/* avoid <linux/mm.h> include hell */
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extern unsigned long max_mapnr;
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#ifndef pfn_valid
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static inline int pfn_valid(unsigned long pfn)
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{
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unsigned long pfn_offset = ARCH_PFN_OFFSET;
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return pfn >= pfn_offset && (pfn - pfn_offset) < max_mapnr;
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}
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#define pfn_valid pfn_valid
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#endif
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#elif defined(CONFIG_SPARSEMEM_VMEMMAP)
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/* memmap is virtually contiguous. */
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#define __pfn_to_page(pfn) (vmemmap + (pfn))
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#define __page_to_pfn(page) (unsigned long)((page) - vmemmap)
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#elif defined(CONFIG_SPARSEMEM)
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/*
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* Note: section's mem_map is encoded to reflect its start_pfn.
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* section[i].section_mem_map == mem_map's address - start_pfn;
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*/
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#define __page_to_pfn(pg) \
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({ const struct page *__pg = (pg); \
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int __sec = page_to_section(__pg); \
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(unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \
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})
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#define __pfn_to_page(pfn) \
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({ unsigned long __pfn = (pfn); \
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struct mem_section *__sec = __pfn_to_section(__pfn); \
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__section_mem_map_addr(__sec) + __pfn; \
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})
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#endif /* CONFIG_FLATMEM/SPARSEMEM */
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/*
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* Convert a physical address to a Page Frame Number and back
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*/
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#define __phys_to_pfn(paddr) PHYS_PFN(paddr)
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#define __pfn_to_phys(pfn) PFN_PHYS(pfn)
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#define page_to_pfn __page_to_pfn
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#define pfn_to_page __pfn_to_page
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#ifdef CONFIG_DEBUG_VIRTUAL
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#define page_to_phys(page) \
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({ \
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unsigned long __pfn = page_to_pfn(page); \
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\
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WARN_ON_ONCE(!pfn_valid(__pfn)); \
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PFN_PHYS(__pfn); \
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})
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#else
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#define page_to_phys(page) PFN_PHYS(page_to_pfn(page))
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#endif /* CONFIG_DEBUG_VIRTUAL */
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#define phys_to_page(phys) pfn_to_page(PHYS_PFN(phys))
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#endif /* __ASSEMBLY__ */
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#endif
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