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sh: memory hot-add for sparsemem users support. 

This enables simple hotplug support for sparsemem users. Presently
this only permits memory being added in to node 0 on ZONE_NORMAL.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
hifive-unleashed-5.1
Paul Mundt 2007-06-07 11:32:52 +09:00 committed by Paul Mundt
parent 05a117847b
commit 33d63bd83b
3 changed files with 51 additions and 1 deletions
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8
arch/sh/mm/Kconfig
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@ -331,6 +331,14 @@ config ARCH_POPULATES_NODE_MAP
config ARCH_SELECT_MEMORY_MODEL
def_bool y
config ARCH_ENABLE_MEMORY_HOTPLUG
def_bool y
depends on SPARSEMEM
config ARCH_MEMORY_PROBE
def_bool y
depends on MEMORY_HOTPLUG
choice
prompt "Kernel page size"
default PAGE_SIZE_4KB

42
arch/sh/mm/init.c
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@ -265,3 +265,45 @@ void free_initrd_mem(unsigned long start, unsigned long end)
printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
}
#endif
#ifdef CONFIG_MEMORY_HOTPLUG
void online_page(struct page *page)
{
ClearPageReserved(page);
init_page_count(page);
__free_page(page);
totalram_pages++;
num_physpages++;
}
int arch_add_memory(int nid, u64 start, u64 size)
{
pg_data_t *pgdat;
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;
pgdat = NODE_DATA(nid);
/* We only have ZONE_NORMAL, so this is easy.. */
ret = __add_pages(pgdat->node_zones + ZONE_NORMAL, start_pfn, nr_pages);
if (unlikely(ret))
printk("%s: Failed, __add_pages() == %d\n", __FUNCTION__, ret);
return ret;
}
EXPORT_SYMBOL_GPL(arch_add_memory);
int remove_memory(u64 start, u64 size)
{
return -EINVAL;
}
EXPORT_SYMBOL_GPL(remove_memory);
int memory_add_physaddr_to_nid(u64 addr)
{
/* Node 0 for now.. */
return 0;
}
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif

2
mm/Kconfig
View File

@ -117,7 +117,7 @@ config MEMORY_HOTPLUG
bool "Allow for memory hot-add"
depends on SPARSEMEM || X86_64_ACPI_NUMA
depends on HOTPLUG && !SOFTWARE_SUSPEND && ARCH_ENABLE_MEMORY_HOTPLUG
depends on (IA64 || X86 || PPC64)
depends on (IA64 || X86 || PPC64 || SUPERH)
comment "Memory hotplug is currently incompatible with Software Suspend"
depends on SPARSEMEM && HOTPLUG && SOFTWARE_SUSPEND