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hotplug-memory: make online_page() common

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All architectures use an effectively identical definition of online_page(), so
just make it common code.  x86-64, ia64, powerpc and sh are actually
identical; x86-32 is slightly different.

x86-32's differences arise because it puts its hotplug pages in the highmem
zone.  We can handle this in the generic code by inspecting the page to see if
its in highmem, and update the totalhigh_pages count appropriately.  This
leaves init_32.c:free_new_highpage with a single caller, so I folded it into
add_one_highpage_init.

I also removed an incorrect comment referring to the NUMA case; any NUMA
details have already been dealt with by the time online_page() is called.

[akpm@linux-foundation.org: fix indenting]
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Dave Hansen <dave@linux.vnet.ibm.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamez.hiroyu@jp.fujitsu.com>
Tested-by: KAMEZAWA Hiroyuki <kamez.hiroyu@jp.fujitsu.com>
Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Christoph Lameter <clameter@sgi.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeremy Fitzhardinge 2008-04-28 02:12:03 -07:00 committed by Linus Torvalds
parent ea01ea937d
commit 180c06efce
6 changed files with 22 additions and 69 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/ia64/mm/init.c
View File

@ -682,15 +682,6 @@ mem_init (void)
}
#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;

9
arch/powerpc/mm/mem.c
View File

@ -110,15 +110,6 @@ EXPORT_SYMBOL(phys_mem_access_prot);
#ifdef CONFIG_MEMORY_HOTPLUG
void online_page(struct page *page)
{
ClearPageReserved(page);
init_page_count(page);
__free_page(page);
totalram_pages++;
num_physpages++;
}
#ifdef CONFIG_NUMA
int memory_add_physaddr_to_nid(u64 start)
{

9
arch/sh/mm/init.c
View File

@ -307,15 +307,6 @@ void free_initrd_mem(unsigned long start, unsigned long end)
#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;

36
arch/x86/mm/init_32.c
View File

@ -287,47 +287,17 @@ static void __init permanent_kmaps_init(pgd_t *pgd_base)
pkmap_page_table = pte;
}
static void __meminit free_new_highpage(struct page *page)
{
init_page_count(page);
__free_page(page);
totalhigh_pages++;
}
void __init add_one_highpage_init(struct page *page, int pfn, int bad_ppro)
{
if (page_is_ram(pfn) && !(bad_ppro && page_kills_ppro(pfn))) {
ClearPageReserved(page);
free_new_highpage(page);
init_page_count(page);
__free_page(page);
totalhigh_pages++;
} else
SetPageReserved(page);
}
static int __meminit
add_one_highpage_hotplug(struct page *page, unsigned long pfn)
{
free_new_highpage(page);
totalram_pages++;
#ifdef CONFIG_FLATMEM
max_mapnr = max(pfn, max_mapnr);
#endif
num_physpages++;
return 0;
}
/*
* Not currently handling the NUMA case.
* Assuming single node and all memory that
* has been added dynamically that would be
* onlined here is in HIGHMEM.
*/
void __meminit online_page(struct page *page)
{
ClearPageReserved(page);
add_one_highpage_hotplug(page, page_to_pfn(page));
}
#ifndef CONFIG_NUMA
static void __init set_highmem_pages_init(int bad_ppro)
{

9
arch/x86/mm/init_64.c
View File

@ -620,15 +620,6 @@ void __init paging_init(void)
/*
* Memory hotplug specific functions
*/
void online_page(struct page *page)
{
ClearPageReserved(page);
init_page_count(page);
__free_page(page);
totalram_pages++;
num_physpages++;
}
#ifdef CONFIG_MEMORY_HOTPLUG
/*
* Memory is added always to NORMAL zone. This means you will never get

19
mm/memory_hotplug.c
View File

@ -219,6 +219,25 @@ static void grow_pgdat_span(struct pglist_data *pgdat,
pgdat->node_start_pfn;
}
void online_page(struct page *page)
{
totalram_pages++;
num_physpages++;
#ifdef CONFIG_HIGHMEM
if (PageHighMem(page))
totalhigh_pages++;
#endif
#ifdef CONFIG_FLATMEM
max_mapnr = max(page_to_pfn(page), max_mapnr);
#endif
ClearPageReserved(page);
init_page_count(page);
__free_page(page);
}
static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages,
void *arg)
{