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memory hotplug: rearrange memory hotplug notifier

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Current memory notifier has some defects yet.  (Fortunately, nothing uses
it.) This patch is to fix and rearrange for them.

  - Add information of start_pfn, nr_pages, and node id if node status is
    changes from/to memoryless node for callback functions.
    Callbacks can't do anything without those information.
  - Add notification going-online status.
    It is necessary for creating per node structure before the node's
    pages are available.
  - Move GOING_OFFLINE status notification after page isolation.
    It is good place for return memory like cache for callback,
    because returned page is not used again.
  - Make CANCEL events for rollingback when error occurs.
  - Delete MEM_MAPPING_INVALID notification. It will be not used.
  - Fix compile error of (un)register_memory_notifier().

Signed-off-by: Yasunori Goto <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Yasunori Goto 2007-10-21 16:41:36 -07:00 • committed by Linus Torvalds
commit 7b78d335ac
3 changed files with 61 additions and 23 deletions
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9
drivers/base/memory.c
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@ -137,7 +137,7 @@ static ssize_t show_mem_state(struct sys_device *dev, char *buf)
return len;
}
static inline int memory_notify(unsigned long val, void *v)
int memory_notify(unsigned long val, void *v)
{
return blocking_notifier_call_chain(&memory_chain, val, v);
}
@ -183,7 +183,6 @@ memory_block_action(struct memory_block *mem, unsigned long action)
break;
case MEM_OFFLINE:
mem->state = MEM_GOING_OFFLINE;
memory_notify(MEM_GOING_OFFLINE, NULL);
start_paddr = page_to_pfn(first_page) << PAGE_SHIFT;
ret = remove_memory(start_paddr,
PAGES_PER_SECTION << PAGE_SHIFT);
@ -191,7 +190,6 @@ memory_block_action(struct memory_block *mem, unsigned long action)
mem->state = old_state;
break;
}
memory_notify(MEM_MAPPING_INVALID, NULL);
break;
default:
printk(KERN_WARNING "%s(%p, %ld) unknown action: %ld\n",
@ -199,11 +197,6 @@ memory_block_action(struct memory_block *mem, unsigned long action)
WARN_ON(1);
ret = -EINVAL;
}
/*
* For now, only notify on successful memory operations
*/
if (!ret)
memory_notify(action, NULL);
return ret;
}