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[PATCH] Fix sparsemem on Cell

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Fix an oops experienced on the Cell architecture when init-time functions,
early_*(), are called at runtime.  It alters the call paths to make sure
that the callers explicitly say whether the call is being made on behalf of
a hotplug even, or happening at boot-time.

It has been compile tested on ppc64, ia64, s390, i386 and x86_64.

Acked-by: Arnd Bergmann <arndb@de.ibm.com>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Acked-by: Andy Whitcroft <apw@shadowen.org>
Cc: Christoph Lameter <clameter@engr.sgi.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Dave Hansen
2007-01-10 23:15:30 -08:00
committed by Linus Torvalds
parent 47a4d5be7c
commit a2f3aa0257
6 changed files with 34 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
mm/memory_hotplug.c
View File

@ -67,11 +67,13 @@ static int __add_zone(struct zone *zone, unsigned long phys_start_pfn)
zone_type = zone - pgdat->node_zones;
if (!populated_zone(zone)) {
int ret = 0;
ret = init_currently_empty_zone(zone, phys_start_pfn, nr_pages);
ret = init_currently_empty_zone(zone, phys_start_pfn,
nr_pages, MEMMAP_HOTPLUG);
if (ret < 0)
return ret;
}
memmap_init_zone(nr_pages, nid, zone_type, phys_start_pfn);
memmap_init_zone(nr_pages, nid, zone_type,
phys_start_pfn, MEMMAP_HOTPLUG);
return 0;
}

25
mm/page_alloc.c
View File

@ -1956,17 +1956,24 @@ static inline unsigned long wait_table_bits(unsigned long size)
* done. Non-atomic initialization, single-pass.
*/
void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
unsigned long start_pfn)
unsigned long start_pfn, enum memmap_context context)
{
struct page *page;
unsigned long end_pfn = start_pfn + size;
unsigned long pfn;
for (pfn = start_pfn; pfn < end_pfn; pfn++) {
if (!early_pfn_valid(pfn))
continue;
if (!early_pfn_in_nid(pfn, nid))
continue;
/*
* There can be holes in boot-time mem_map[]s
* handed to this function. They do not
* exist on hotplugged memory.
*/
if (context == MEMMAP_EARLY) {
if (!early_pfn_valid(pfn))
continue;
if (!early_pfn_in_nid(pfn, nid))
continue;
}
page = pfn_to_page(pfn);
set_page_links(page, zone, nid, pfn);
init_page_count(page);
@ -1993,7 +2000,7 @@ void zone_init_free_lists(struct pglist_data *pgdat, struct zone *zone,
#ifndef __HAVE_ARCH_MEMMAP_INIT
#define memmap_init(size, nid, zone, start_pfn) \
memmap_init_zone((size), (nid), (zone), (start_pfn))
memmap_init_zone((size), (nid), (zone), (start_pfn), MEMMAP_EARLY)
#endif
static int __cpuinit zone_batchsize(struct zone *zone)
@ -2239,7 +2246,8 @@ static __meminit void zone_pcp_init(struct zone *zone)
__meminit int init_currently_empty_zone(struct zone *zone,
unsigned long zone_start_pfn,
unsigned long size)
unsigned long size,
enum memmap_context context)
{
struct pglist_data *pgdat = zone->zone_pgdat;
int ret;
@ -2683,7 +2691,8 @@ static void __meminit free_area_init_core(struct pglist_data *pgdat,
if (!size)
continue;
ret = init_currently_empty_zone(zone, zone_start_pfn, size);
ret = init_currently_empty_zone(zone, zone_start_pfn,
size, MEMMAP_EARLY);
BUG_ON(ret);
zone_start_pfn += size;
}