HWPOISON, hugetlb: set/clear PG_hwpoison bits on hugepage

To avoid race condition between concurrent memory errors on identified
hugepage, we atomically test and set PG_hwpoison bit on the head page.
All pages in the error hugepage are considered as hwpoisoned
for now, so set and clear all PG_hwpoison bits in the hugepage
with page lock of the head page held.

Dependency:
  "HWPOISON, hugetlb: enable error handling path for hugepage"

Signed-off-by: Naoya Horiguchi <[email protected]>
Cc: Andrew Morton <[email protected]>
Acked-by: Fengguang Wu <[email protected]>
Signed-off-by: Andi Kleen <[email protected]>

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