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fix memory hot remove not configured case.

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Now, arch dependent code around CONFIG_MEMORY_HOTREMOVE is a mess.
This patch cleans up them. This is against 2.6.23-rc6-mm1.

 - fix compile failure on ia64/ CONFIG_MEMORY_HOTPLUG && !CONFIG_MEMORY_HOTREMOVE case.
 - For !CONFIG_MEMORY_HOTREMOVE, add generic no-op remove_memory(),
   which returns -EINVAL.
 - removed remove_pages() only used in powerpc.
 - removed no-op remove_memory() in i386, sh, sparc64, x86_64.

 - only powerpc returns -ENOSYS at memory hot remove(no-op). changes it
   to return -EINVAL.

Note:
Currently, only ia64 supports CONFIG_MEMORY_HOTREMOVE. I welcome other
archs if there are requirements and testers.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@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:
KAMEZAWA Hiroyuki
2007-10-16 01:26:14 -07:00
committed by Linus Torvalds
parent de33b821f3
commit 48e94196a5
8 changed files with 10 additions and 78 deletions
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45
arch/powerpc/mm/mem.c
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@@ -129,51 +129,6 @@ int __devinit arch_add_memory(int nid, u64 start, u64 size)
return __add_pages(zone, start_pfn, nr_pages);
}
/*
* First pass at this code will check to determine if the remove
* request is within the RMO. Do not allow removal within the RMO.
*/
int __devinit remove_memory(u64 start, u64 size)
{
struct zone *zone;
unsigned long start_pfn, end_pfn, nr_pages;
start_pfn = start >> PAGE_SHIFT;
nr_pages = size >> PAGE_SHIFT;
end_pfn = start_pfn + nr_pages;
printk("%s(): Attempting to remove memoy in range "
"%lx to %lx\n", __func__, start, start+size);
/*
* check for range within RMO
*/
zone = page_zone(pfn_to_page(start_pfn));
printk("%s(): memory will be removed from "
"the %s zone\n", __func__, zone->name);
/*
* not handling removing memory ranges that
* overlap multiple zones yet
*/
if (end_pfn > (zone->zone_start_pfn + zone->spanned_pages))
goto overlap;
/* make sure it is NOT in RMO */
if ((start < lmb.rmo_size) || ((start+size) < lmb.rmo_size)) {
printk("%s(): range to be removed must NOT be in RMO!\n",
__func__);
goto in_rmo;
}
return __remove_pages(zone, start_pfn, nr_pages);
overlap:
printk("%s(): memory range to be removed overlaps "
"multiple zones!!!\n", __func__);
in_rmo:
return -1;
}
#endif /* CONFIG_MEMORY_HOTPLUG */
void show_mem(void)