hugetlb: try to search again if it is really needed

hugetlb: try to search again if it is really needed

Search again only if some holes may be skipped in the first pass.

[[email protected]: clean up crazy compound definition]
Signed-off-by: Xiao Guangrong <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Hillf Danton <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: KAMEZAWA Hiroyuki <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>