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[PATCH] memory hotplug prep: __section_nr helper
A little helper that we use in the hotplug code. Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -509,6 +509,7 @@ static inline struct mem_section *__nr_to_section(unsigned long nr)
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return NULL;
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return &mem_section[SECTION_NR_TO_ROOT(nr)][nr & SECTION_ROOT_MASK];
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}
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extern int __section_nr(struct mem_section* ms);
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/*
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* We use the lower bits of the mem_map pointer to store
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25
mm/sparse.c
25
mm/sparse.c
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@ -72,6 +72,31 @@ static inline int sparse_index_init(unsigned long section_nr, int nid)
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}
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#endif
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/*
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* Although written for the SPARSEMEM_EXTREME case, this happens
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* to also work for the flat array case becase
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* NR_SECTION_ROOTS==NR_MEM_SECTIONS.
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*/
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int __section_nr(struct mem_section* ms)
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{
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unsigned long root_nr;
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struct mem_section* root;
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for (root_nr = 0;
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root_nr < NR_MEM_SECTIONS;
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root_nr += SECTIONS_PER_ROOT) {
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root = __nr_to_section(root_nr);
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if (!root)
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continue;
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if ((ms >= root) && (ms < (root + SECTIONS_PER_ROOT)))
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break;
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}
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return (root_nr * SECTIONS_PER_ROOT) + (ms - root);
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}
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/* Record a memory area against a node. */
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void memory_present(int nid, unsigned long start, unsigned long end)
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{
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