[PATCH v2] mm, page_alloc: Add missing check for memory holes

From: Tony Luck commit 13ad59df67f19788f6c22985b1a33e466eceb643 ("mm, page_alloc: avoid page_to_pfn() when merging buddies") moved the check for memory holes out of page_is_buddy() and had the callers do the check. But this wasn't done correctly in one place which caused

[PATCH v2] mm, page_alloc: Add missing check for memory holes

From: Tony Luck commit 13ad59df67f19788f6c22985b1a33e466eceb643 ("mm, page_alloc: avoid page_to_pfn() when merging buddies") moved the check for memory holes out of page_is_buddy() and had the callers do the check. But this wasn't done correctly in one place which caused ia64 to crash very