mm, hugetlb: close race when setting PageTail for gigantic pages

Now that gigantic pages are dynamically allocatable, care must be taken to
ensure that p->first_page is valid before setting PageTail.

If this isn't done, then it is possible to race and have compound_head()
return NULL.

Signed-off-by: David Rientjes <[email protected]>
Acked-by: Davidlohr Bueso <[email protected]>
Cc: Luiz Capitulino <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Acked-by: Hillf Danton <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions