Commit 7e9238fb authored by Gerald Schaefer's avatar Gerald Schaefer Committed by Martin Schwidefsky
Browse files

[S390] Add support for memory hot-remove. 



This patch enables memory hot-remove on s390.

Signed-off-by: default avatarGerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
parent 519620cc

arch/s390/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -317,6 +317,9 @@ config ARCH_ENABLE_MEMORY_HOTPLUG 
	def_bool y

	depends on SPARSEMEM



config ARCH_ENABLE_MEMORY_HOTREMOVE

	def_bool y



source "mm/Kconfig"



comment "I/O subsystem configuration"

arch/s390/mm/init.c

+12 −1
Original line number Diff line number Diff line
@@ -179,7 +179,7 @@ int arch_add_memory(int nid, u64 start, u64 size) 
	int rc;



	pgdat = NODE_DATA(nid);

	zone = pgdat->node_zones + ZONE_NORMAL;

	zone = pgdat->node_zones + ZONE_MOVABLE;

	rc = vmem_add_mapping(start, size);

	if (rc)

		return rc;
@@ -189,3 +189,14 @@ int arch_add_memory(int nid, u64 start, u64 size) 
	return rc;

}

#endif /* CONFIG_MEMORY_HOTPLUG */



#ifdef CONFIG_MEMORY_HOTREMOVE

int remove_memory(u64 start, u64 size)

{

	unsigned long start_pfn, end_pfn;



	start_pfn = PFN_DOWN(start);

	end_pfn = start_pfn + PFN_DOWN(size);

	return offline_pages(start_pfn, end_pfn, 120 * HZ);

}

#endif /* CONFIG_MEMORY_HOTREMOVE */

drivers/s390/char/sclp_cmd.c

+5 −0
Original line number Diff line number Diff line
@@ -427,6 +427,8 @@ static int sclp_mem_notifier(struct notifier_block *nb, 
			sclp_attach_storage(id);

	switch (action) {

	case MEM_ONLINE:

	case MEM_GOING_OFFLINE:

	case MEM_CANCEL_OFFLINE:

		break;

	case MEM_GOING_ONLINE:

		rc = sclp_mem_change_state(start, size, 1);
@@ -434,6 +436,9 @@ static int sclp_mem_notifier(struct notifier_block *nb, 
	case MEM_CANCEL_ONLINE:

		sclp_mem_change_state(start, size, 0);

		break;

	case MEM_OFFLINE:

		sclp_mem_change_state(start, size, 0);

		break;

	default:

		rc = -EINVAL;

		break;