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bootmem: revisit alloc_bootmem_section 

Since alloc_bootmem_core does no goal-fallback anymore and just returns
NULL if the allocation fails, we might now use it in alloc_bootmem_section
without all the fixup code for a misplaced allocation.

Also, the limit can be the first PFN of the next section as the semantics
is that the limit is _above_ the allocated region, not within.

Signed-off-by: Johannes Weiner <hannes@saeurebad.de>
Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2008-07-23 21:28:09 -07:00 committed by Linus Torvalds
parent 4cc278b721
commit 75a56cfe9f
1 changed files with 6 additions and 21 deletions
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27
mm/bootmem.c
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@ -632,30 +632,15 @@ void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
void * __init alloc_bootmem_section(unsigned long size,
unsigned long section_nr)
{
void *ptr;
unsigned long limit, goal, start_nr, end_nr, pfn;
struct pglist_data *pgdat;
bootmem_data_t *bdata;
unsigned long pfn, goal, limit;
pfn = section_nr_to_pfn(section_nr);
goal = PFN_PHYS(pfn);
limit = PFN_PHYS(section_nr_to_pfn(section_nr + 1)) - 1;
pgdat = NODE_DATA(early_pfn_to_nid(pfn));
ptr = alloc_bootmem_core(pgdat->bdata, size, SMP_CACHE_BYTES, goal,
limit);
goal = pfn << PAGE_SHIFT;
limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;
bdata = &bootmem_node_data[early_pfn_to_nid(pfn)];
if (!ptr)
return NULL;
start_nr = pfn_to_section_nr(PFN_DOWN(__pa(ptr)));
end_nr = pfn_to_section_nr(PFN_DOWN(__pa(ptr) + size));
if (start_nr != section_nr || end_nr != section_nr) {
printk(KERN_WARNING "alloc_bootmem failed on section %ld.\n",
section_nr);
free_bootmem_node(pgdat, __pa(ptr), size);
ptr = NULL;
}
return ptr;
return alloc_bootmem_core(bdata, size, SMP_CACHE_BYTES, goal, limit);
}
#endif