Messages in this thread | | | Date | Wed, 2 Apr 2008 22:52:50 -0700 | From | "Yinghai Lu" <> | Subject | Re: [Patch 003/005](memory hotplug) make alloc_bootmem_section() |
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On Wed, Apr 2, 2008 at 10:41 PM, Yasunori Goto <y-goto@jp.fujitsu.com> wrote: > alloc_bootmem_section() can allocate specified section's area. > This is used for usemap to keep same section with pgdat by later patch. > > Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com> > > include/linux/bootmem.h | 2 ++ > mm/bootmem.c | 25 +++++++++++++++++++++++++ > 2 files changed, 27 insertions(+) > > Index: current/include/linux/bootmem.h > =================================================================== > --- current.orig/include/linux/bootmem.h 2008-04-01 20:56:39.000000000 +0900 > +++ current/include/linux/bootmem.h 2008-04-01 20:59:02.000000000 +0900 > @@ -101,6 +101,8 @@ > extern void free_bootmem_node(pg_data_t *pgdat, > unsigned long addr, > unsigned long size); > +extern void *alloc_bootmem_section(unsigned long size, > + unsigned long section_nr); > > #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE > #define alloc_bootmem_node(pgdat, x) \ > Index: current/mm/bootmem.c > =================================================================== > --- current.orig/mm/bootmem.c 2008-04-01 20:56:39.000000000 +0900 > +++ current/mm/bootmem.c 2008-04-01 20:59:02.000000000 +0900 > @@ -540,6 +540,31 @@ > return __alloc_bootmem(size, align, goal); > } > > +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; > + > + 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); > + > + 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_core(pgdat->bdata, __pa(ptr), size); > + ptr = NULL; > + }
how about __alloc_bootmem_core return NULL?
YH
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