Flags from spin_lock_irqsave() are saved into global variable and restored
from it.  My gut feeling this is very racy.
Signed-off-by: NAlexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>