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Merge branch 'acpi-hotplug'

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* acpi-hotplug:
  ACPI: Do not use CONFIG_ACPI_HOTPLUG_MEMORY_MODULE
  ACPI / cpufreq: Add ACPI processor device IDs to acpi-cpufreq
  Memory hotplug: Move alternative function definitions to header
  ACPI / processor: Fix potential NULL pointer dereference in acpi_processor_add()
  Memory hotplug / ACPI: Simplify memory removal
  ACPI / scan: Add second pass of companion offlining to hot-remove code
  Driver core / MM: Drop offline_memory_block()
  ACPI / processor: Pass processor object handle to acpi_bind_one()
  ACPI: Drop removal_type field from struct acpi_device
  Driver core / memory: Simplify __memory_block_change_state()
  ACPI / processor: Initialize per_cpu(processors, pr->id) properly
  CPU: Fix sysfs cpu/online of offlined CPUs
  Driver core: Introduce offline/online callbacks for memory blocks
  ACPI / memhotplug: Bind removable memory blocks to ACPI device nodes
  ACPI / processor: Use common hotplug infrastructure
  ACPI / hotplug: Use device offline/online for graceful hot-removal
  Driver core: Use generic offline/online for CPU offline/online
  Driver core: Add offline/online device operations
This commit is contained in:
Rafael J. Wysocki
2013-06-28 12:58:05 +02:00
parent 45e00374db 08f502c1c3
commit a204dbc61b
20 changed files with 1116 additions and 926 deletions
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81
mm/memory_hotplug.c
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@@ -1621,6 +1621,7 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
{
return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ);
}
#endif /* CONFIG_MEMORY_HOTREMOVE */
/**
* walk_memory_range - walks through all mem sections in [start_pfn, end_pfn)
@@ -1634,7 +1635,7 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
*
* Returns the return value of func.
*/
static int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
void *arg, int (*func)(struct memory_block *, void *))
{
struct memory_block *mem = NULL;
@@ -1671,24 +1672,7 @@ static int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
return 0;
}
/**
* offline_memory_block_cb - callback function for offlining memory block
* @mem: the memory block to be offlined
* @arg: buffer to hold error msg
*
* Always return 0, and put the error msg in arg if any.
*/
static int offline_memory_block_cb(struct memory_block *mem, void *arg)
{
int *ret = arg;
int error = offline_memory_block(mem);
if (error != 0 && *ret == 0)
*ret = error;
return 0;
}
#ifdef CONFIG_MEMORY_HOTREMOVE
static int is_memblock_offlined_cb(struct memory_block *mem, void *arg)
{
int ret = !is_memblock_offlined(mem);
@@ -1814,54 +1798,22 @@ void try_offline_node(int nid)
}
EXPORT_SYMBOL(try_offline_node);
int __ref remove_memory(int nid, u64 start, u64 size)
void __ref remove_memory(int nid, u64 start, u64 size)
{
unsigned long start_pfn, end_pfn;
int ret = 0;
int retry = 1;
start_pfn = PFN_DOWN(start);
end_pfn = PFN_UP(start + size - 1);
/*
* When CONFIG_MEMCG is on, one memory block may be used by other
* blocks to store page cgroup when onlining pages. But we don't know
* in what order pages are onlined. So we iterate twice to offline
* memory:
* 1st iterate: offline every non primary memory block.
* 2nd iterate: offline primary (i.e. first added) memory block.
*/
repeat:
walk_memory_range(start_pfn, end_pfn, &ret,
offline_memory_block_cb);
if (ret) {
if (!retry)
return ret;
retry = 0;
ret = 0;
goto repeat;
}
int ret;
lock_memory_hotplug();
/*
* we have offlined all memory blocks like this:
* 1. lock memory hotplug
* 2. offline a memory block
* 3. unlock memory hotplug
*
* repeat step1-3 to offline the memory block. All memory blocks
* must be offlined before removing memory. But we don't hold the
* lock in the whole operation. So we should check whether all
* memory blocks are offlined.
* All memory blocks must be offlined before removing memory. Check
* whether all memory blocks in question are offline and trigger a BUG()
* if this is not the case.
*/
ret = walk_memory_range(start_pfn, end_pfn, NULL,
ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL,
is_memblock_offlined_cb);
if (ret) {
unlock_memory_hotplug();
return ret;
BUG();
}
/* remove memmap entry */
@@ -1872,17 +1824,6 @@ repeat:
try_offline_node(nid);
unlock_memory_hotplug();
return 0;
}
#else
int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
{
return -EINVAL;
}
int remove_memory(int nid, u64 start, u64 size)
{
return -EINVAL;
}
#endif /* CONFIG_MEMORY_HOTREMOVE */
EXPORT_SYMBOL_GPL(remove_memory);
#endif /* CONFIG_MEMORY_HOTREMOVE */