Memory hotadd doesn't need SPARSEMEM, but can be handled by just preallocating
mem_maps. This only needs some untangling of ifdefs to enable the necessary
code even without SPARSEMEM.
Originally from Keith Mannthey, hacked by AK.
Signed-off-by: Andi Kleen <ak@xxxxxxx>
---
arch/x86_64/kernel/e820.c | 2 +-
arch/x86_64/mm/init.c | 23 +++++++++++++++++++++--
drivers/acpi/Kconfig | 2 +-
include/linux/init.h | 3 ++-
include/linux/memory_hotplug.h | 6 ++++--
5 files changed, 29 insertions(+), 7 deletions(-)
Index: linux/arch/x86_64/mm/init.c
===================================================================
--- linux.orig/arch/x86_64/mm/init.c
+++ linux/arch/x86_64/mm/init.c
@@ -507,9 +507,8 @@ void __init clear_kernel_mapping(unsigne
/*
* Memory hotplug specific functions
- * These are only for non-NUMA machines right now.
*/
-#ifdef CONFIG_MEMORY_HOTPLUG
+#if defined(CONFIG_ACPI_HOTPLUG_MEMORY) || defined(CONFIG_ACPI_HOTPLUG_MEMORY_MODULE)
void online_page(struct page *page)
{
@@ -520,6 +519,26 @@ void online_page(struct page *page)
num_physpages++;
}
+#ifndef CONFIG_MEMORY_HOTPLUG
+/*
+ * Memory Hotadd without sparsemem. The mem_maps have been allocated in advance,
+ * just online the pages.
+ */
+int __add_pages(struct zone *z, unsigned long start_pfn, unsigned long nr_pages)
+{
+ int err = -EIO;
+ unsigned long pfn;
+ for (pfn = start_pfn; pfn < start_pfn + nr_pages; pfn++) {
+ unsigned long addr = pfn << PAGE_SHIFT;
+ if (pfn_valid(pfn) && e820_mapped(addr, addr+1, E820_RAM)) {
+ online_page(pfn_to_page(pfn));
+ err = 0;
+ }
+ }
+ return err;
+}
+#endif
+
int add_memory(u64 start, u64 size)
{
struct pglist_data *pgdat = NODE_DATA(0);
Index: linux/drivers/acpi/Kconfig
===================================================================
--- linux.orig/drivers/acpi/Kconfig
+++ linux/drivers/acpi/Kconfig
@@ -316,7 +316,7 @@ config ACPI_CONTAINER
config ACPI_HOTPLUG_MEMORY
tristate "Memory Hotplug"
depends on ACPI
- depends on MEMORY_HOTPLUG
+ depends on MEMORY_HOTPLUG || X86_64
default n
help
This driver adds supports for ACPI Memory Hotplug. This driver
Index: linux/include/linux/memory_hotplug.h
===================================================================
--- linux.orig/include/linux/memory_hotplug.h
+++ linux/include/linux/memory_hotplug.h
@@ -58,8 +58,6 @@ extern int add_one_highpage(struct page
/* need some defines for these for archs that don't support it */
extern void online_page(struct page *page);
/* VM interface that may be used by firmware interface */
-extern int add_memory(u64 start, u64 size);
-extern int remove_memory(u64 start, u64 size);
extern int online_pages(unsigned long, unsigned long);
/* reasonably generic interface to expand the physical pages in a zone */
@@ -105,4 +103,8 @@ static inline int __remove_pages(struct
dump_stack();
return -ENOSYS;
}
+
+extern int add_memory(u64 start, u64 size);
+extern int remove_memory(u64 start, u64 size);
+
#endif /* __LINUX_MEMORY_HOTPLUG_H */
Index: linux/include/linux/init.h
===================================================================
--- linux.orig/include/linux/init.h
+++ linux/include/linux/init.h
@@ -241,7 +241,8 @@ void __init parse_early_param(void);
#define __cpuexitdata __exitdata
#endif
-#ifdef CONFIG_MEMORY_HOTPLUG
+#if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_ACPI_HOTPLUG_MEMORY) \
+ || defined(CONFIG_ACPI_HOTPLUG_MEMORY_MODULE)
#define __meminit
#define __meminitdata
#define __memexit
Index: linux/arch/x86_64/kernel/e820.c
===================================================================
--- linux.orig/arch/x86_64/kernel/e820.c
+++ linux/arch/x86_64/kernel/e820.c
@@ -80,7 +80,7 @@ static inline int bad_addr(unsigned long
return 0;
}
-int __init e820_mapped(unsigned long start, unsigned long end, unsigned type)
+int __meminit e820_mapped(unsigned long start, unsigned long end, unsigned type)
{
int i;
for (i = 0; i < e820.nr_map; i++) {
-
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