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[PATCH] x86_64: Support memory hotadd without sparsemem

Browse source 
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@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2006-04-07 19:49:15 +02:00 committed by Linus Torvalds
parent 805e8c03c9
commit 9d99aaa31f
6 changed files with 47 additions and 12 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
arch/i386/mm/init.c
View file

@ -651,6 +651,7 @@ void __init mem_init(void)
* Specifically, in the case of x86, we will always add
* memory to the highmem for now.
*/
#ifdef CONFIG_HOTPLUG_MEMORY
#ifndef CONFIG_NEED_MULTIPLE_NODES
int add_memory(u64 start, u64 size)
{
@ -667,6 +668,7 @@ int remove_memory(u64 start, u64 size)
return -EINVAL;
}
#endif
#endif
kmem_cache_t *pgd_cache;
kmem_cache_t *pmd_cache;

2
arch/x86_64/kernel/e820.c
View file

@ -80,7 +80,7 @@ static inline int bad_addr(unsigned long *addrp, unsigned long size)
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++) {

36
arch/x86_64/mm/init.c
View file

@ -507,9 +507,8 @@ void __init clear_kernel_mapping(unsigned long address, unsigned long size)
/*
* 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 +519,39 @@ 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;
unsigned long total = 0, mem = 0;
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;
mem++;
}
total++;
}
if (!err) {
z->spanned_pages += total;
z->present_pages += mem;
z->zone_pgdat->node_spanned_pages += total;
z->zone_pgdat->node_present_pages += mem;
}
return err;
}
#endif
/*
* Memory is added always to NORMAL zone. This means you will never get
* additional DMA/DMA32 memory.
*/
int add_memory(u64 start, u64 size)
{
struct pglist_data *pgdat = NODE_DATA(0);

2
drivers/acpi/Kconfig
View file

@ -329,7 +329,7 @@ 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

3
include/linux/init.h
View file

@ -245,7 +245,8 @@ 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

14
include/linux/memory_hotplug.h
View file

@ -58,8 +58,6 @@ extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
/* 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 */
@ -92,11 +90,6 @@ static inline int mhp_notimplemented(const char *func)
return -ENOSYS;
}
static inline int __add_pages(struct zone *zone, unsigned long start_pfn,
unsigned long nr_pages)
{
return mhp_notimplemented(__FUNCTION__);
}
#endif /* ! CONFIG_MEMORY_HOTPLUG */
static inline int __remove_pages(struct zone *zone, unsigned long start_pfn,
unsigned long nr_pages)
@ -105,4 +98,11 @@ static inline int __remove_pages(struct zone *zone, unsigned long start_pfn,
dump_stack();
return -ENOSYS;
}
#if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_ACPI_HOTPLUG_MEMORY) \
|| defined(CONFIG_ACPI_HOTPLUG_MEMORY_MODULE)
extern int add_memory(u64 start, u64 size);
extern int remove_memory(u64 start, u64 size);
#endif
#endif /* __LINUX_MEMORY_HOTPLUG_H */