On Thu, Sep 27, 2012 at 1:45 AM,  [off-list ref] wrote:

From: Wen Congyang <redacted>

hwpoisoned may set when we offline a page by the sysfs interface
/sys/devices/system/memory/soft_offline_page or
/sys/devices/system/memory/hard_offline_page. If we don't clear
this flag when onlining pages, this page can't be freed, and will
not in free list. So we can't offline these pages again. So we
should clear this flag when onlining pages.

This seems wrong fix to me.  After offline, memory may or may not
change with new one. Thus we can't assume any memory status. Thus,
we should just forget hwpoison status at _offline_ event.

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