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[PATCH] memory hotplug: ppc64 specific hot-add functions 

Here is a set of ppc64 specific patches that at least allow
compilation/booting with the following configurations:

FLATMEM
SPARSEMEN
SPARSEMEM + MEMORY_HOTPLUG

Signed-off-by: Mike Kravetz <kravetz@us.ibm.com>
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>
hifive-unleashed-5.1
Dave Hansen 2005-10-29 18:16:58 -07:00 committed by Linus Torvalds
parent 05039b9263
commit bb7e7e032d
1 changed files with 77 additions and 0 deletions
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77
arch/ppc64/mm/init.c
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@ -871,3 +871,80 @@ pgprot_t phys_mem_access_prot(struct file *file, unsigned long addr,
return vma_prot;
}
EXPORT_SYMBOL(phys_mem_access_prot);
#ifdef CONFIG_MEMORY_HOTPLUG
void online_page(struct page *page)
{
ClearPageReserved(page);
free_cold_page(page);
totalram_pages++;
num_physpages++;
}
/*
* This works only for the non-NUMA case. Later, we'll need a lookup
* to convert from real physical addresses to nid, that doesn't use
* pfn_to_nid().
*/
int __devinit add_memory(u64 start, u64 size)
{
struct pglist_data *pgdata = NODE_DATA(0);
struct zone *zone;
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
/* this should work for most non-highmem platforms */
zone = pgdata->node_zones;
return __add_pages(zone, start_pfn, nr_pages);
return 0;
}
/*
* First pass at this code will check to determine if the remove
* request is within the RMO. Do not allow removal within the RMO.
*/
int __devinit remove_memory(u64 start, u64 size)
{
struct zone *zone;
unsigned long start_pfn, end_pfn, nr_pages;
start_pfn = start >> PAGE_SHIFT;
nr_pages = size >> PAGE_SHIFT;
end_pfn = start_pfn + nr_pages;
printk("%s(): Attempting to remove memoy in range "
"%lx to %lx\n", __func__, start, start+size);
/*
* check for range within RMO
*/
zone = page_zone(pfn_to_page(start_pfn));
printk("%s(): memory will be removed from "
"the %s zone\n", __func__, zone->name);
/*
* not handling removing memory ranges that
* overlap multiple zones yet
*/
if (end_pfn > (zone->zone_start_pfn + zone->spanned_pages))
goto overlap;
/* make sure it is NOT in RMO */
if ((start < lmb.rmo_size) || ((start+size) < lmb.rmo_size)) {
printk("%s(): range to be removed must NOT be in RMO!\n",
__func__);
goto in_rmo;
}
return __remove_pages(zone, start_pfn, nr_pages);
overlap:
printk("%s(): memory range to be removed overlaps "
"multiple zones!!!\n", __func__);
in_rmo:
return -1;
}
#endif /* CONFIG_MEMORY_HOTPLUG */