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7d4340bb92
We do this only with VMEMMAP config so that our page_to_[nid/section] etc are not impacted. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_SPARSEMEM_H
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#define _ASM_POWERPC_SPARSEMEM_H 1
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#ifdef __KERNEL__
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#ifdef CONFIG_SPARSEMEM
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/*
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* SECTION_SIZE_BITS 2^N: how big each section will be
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* MAX_PHYSMEM_BITS 2^N: how much memory we can have in that space
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*/
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#define SECTION_SIZE_BITS 24
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/*
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* If we store section details in page->flags we can't increase the MAX_PHYSMEM_BITS
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* if we increase SECTIONS_WIDTH we will not store node details in page->flags and
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* page_to_nid does a page->section->node lookup
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* Hence only increase for VMEMMAP.
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*/
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#ifdef CONFIG_SPARSEMEM_VMEMMAP
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#define MAX_PHYSMEM_BITS 47
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#else
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#define MAX_PHYSMEM_BITS 46
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#endif
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#endif /* CONFIG_SPARSEMEM */
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#ifdef CONFIG_MEMORY_HOTPLUG
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extern int create_section_mapping(unsigned long start, unsigned long end, int nid);
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extern int remove_section_mapping(unsigned long start, unsigned long end);
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#ifdef CONFIG_PPC_BOOK3S_64
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extern void resize_hpt_for_hotplug(unsigned long new_mem_size);
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#else
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static inline void resize_hpt_for_hotplug(unsigned long new_mem_size) { }
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#endif
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#ifdef CONFIG_NUMA
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extern int hot_add_scn_to_nid(unsigned long scn_addr);
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#else
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static inline int hot_add_scn_to_nid(unsigned long scn_addr)
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{
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return 0;
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}
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#endif /* CONFIG_NUMA */
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#endif /* CONFIG_MEMORY_HOTPLUG */
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_SPARSEMEM_H */
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