sched/headers: Prepare to remove the <linux/gfp.h> include from <linux/sched.h>

<linux/topology.h> is still needed - also update other headers
and .c files that depend on sched.h including gfp.h (and its
sub-headers) for them.
Acked-by: NLinus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: NIngo Molnar <mingo@kernel.org>

include/linux/sched.h

@@ -56,6 +56,7 @@ struct sched_param {
 #include <linux/llist.h>
 #include <linux/uidgid.h>
 #include <linux/gfp.h>
+#include <linux/topology.h>
 #include <linux/magic.h>
 #include <linux/cgroup-defs.h>
 

include/linux/sched/mm.h

@@ -2,5 +2,6 @@
 #define _LINUX_SCHED_MM_H
 
 #include <linux/sched.h>
+#include <linux/gfp.h>
 
 #endif /* _LINUX_SCHED_MM_H */

lib/percpu_ida.c

@@ -14,6 +14,7 @@
  * General Public License for more details.
  */
 
+#include <linux/mm.h>
 #include <linux/bitmap.h>
 #include <linux/bitops.h>
 #include <linux/bug.h>