mm: hugetlb: replace hugetlb_free_vmemmap_enabled with a static_key

The page_fixed_fake_head() is used throughout memory management and the
conditional check requires checking a global variable, although the
overhead of this check may be small, it increases when the memory cache
comes under pressure.  Also, the global variable will not be modified
after system boot, so it is very appropriate to use static key machanism.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Muchun Song <[email protected]>
Reviewed-by: Barry Song <[email protected]>
Cc: Bodeddula Balasubramaniam <[email protected]>
Cc: Chen Huang <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Fam Zheng <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Mike Kravetz <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: Qi Zheng <[email protected]>
Cc: Xiongchun Duan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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