sched/headers: Prepare for new header dependencies before moving code to <linux/sched/hotplug.h>

We are going to split <linux/sched/hotplug.h> out of <linux/sched.h>, which
will have to be picked up from other headers and a couple of .c files.

Create a trivial placeholder <linux/sched/hotplug.h> file that just
maps to <linux/sched.h> to make this patch obviously correct and
bisectable.

Include the new header in the files that are going to need it.

Acked-by: Linus 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: Ingo Molnar <mingo@kernel.org>

arch/arm/kernel/smp.c

@@ -12,6 +12,7 @@
 #include <linux/init.h>
 #include <linux/spinlock.h>
 #include <linux/sched.h>
+#include <linux/sched/hotplug.h>
 #include <linux/interrupt.h>
 #include <linux/cache.h>
 #include <linux/profile.h>

arch/arm64/include/asm/mmu_context.h

@@ -25,6 +25,7 @@
 
 #include <linux/compiler.h>
 #include <linux/sched.h>
+#include <linux/sched/hotplug.h>
 
 #include <asm/cacheflush.h>
 #include <asm/cpufeature.h>

arch/arm64/kernel/smp.c

@@ -22,6 +22,7 @@
 #include <linux/init.h>
 #include <linux/spinlock.h>
 #include <linux/sched.h>
+#include <linux/sched/hotplug.h>
 #include <linux/interrupt.h>
 #include <linux/cache.h>
 #include <linux/profile.h>

arch/ia64/kernel/process.c

@@ -21,6 +21,7 @@
 #include <linux/personality.h>
 #include <linux/sched.h>
 #include <linux/sched/debug.h>
+#include <linux/sched/hotplug.h>
 #include <linux/stddef.h>
 #include <linux/thread_info.h>
 #include <linux/unistd.h>

arch/metag/kernel/smp.c

@@ -13,6 +13,7 @@
 #include <linux/init.h>
 #include <linux/spinlock.h>
 #include <linux/sched.h>
+#include <linux/sched/hotplug.h>
 #include <linux/interrupt.h>
 #include <linux/cache.h>
 #include <linux/profile.h>

arch/mips/cavium-octeon/smp.c

@@ -11,6 +11,7 @@
 #include <linux/interrupt.h>
 #include <linux/kernel_stat.h>
 #include <linux/sched.h>
+#include <linux/sched/hotplug.h>
 #include <linux/init.h>
 #include <linux/export.h>
 

arch/mips/kernel/smp-bmips.c

@@ -10,6 +10,7 @@
 
 #include <linux/init.h>
 #include <linux/sched.h>
+#include <linux/sched/hotplug.h>
 #include <linux/mm.h>
 #include <linux/delay.h>
 #include <linux/smp.h>

arch/mips/kernel/smp-cps.c

@@ -12,6 +12,7 @@
 #include <linux/io.h>
 #include <linux/irqchip/mips-gic.h>
 #include <linux/sched.h>
+#include <linux/sched/hotplug.h>
 #include <linux/slab.h>
 #include <linux/smp.h>
 #include <linux/types.h>

arch/mips/loongson64/loongson-3/smp.c

@@ -17,6 +17,7 @@
 #include <linux/init.h>
 #include <linux/cpu.h>
 #include <linux/sched.h>
+#include <linux/sched/hotplug.h>
 #include <linux/smp.h>
 #include <linux/cpufreq.h>
 #include <asm/processor.h>

arch/powerpc/platforms/85xx/smp.c

@@ -12,6 +12,7 @@
 
 #include <linux/stddef.h>
 #include <linux/kernel.h>
+#include <linux/sched/hotplug.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/of.h>

arch/powerpc/platforms/powermac/smp.c

@@ -23,6 +23,7 @@
  */
 #include <linux/kernel.h>
 #include <linux/sched.h>
+#include <linux/sched/hotplug.h>
 #include <linux/smp.h>
 #include <linux/interrupt.h>
 #include <linux/kernel_stat.h>

arch/powerpc/platforms/powernv/smp.c

@@ -12,6 +12,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/sched.h>
+#include <linux/sched/hotplug.h>
 #include <linux/smp.h>
 #include <linux/interrupt.h>
 #include <linux/delay.h>

arch/powerpc/platforms/pseries/hotplug-cpu.c

@@ -24,6 +24,7 @@
 #include <linux/interrupt.h>
 #include <linux/delay.h>
 #include <linux/sched.h>	/* for idle_task_exit */
+#include <linux/sched/hotplug.h>
 #include <linux/cpu.h>
 #include <linux/of.h>
 #include <linux/slab.h>

arch/s390/kernel/smp.c

@@ -31,6 +31,7 @@
 #include <linux/irqflags.h>
 #include <linux/cpu.h>
 #include <linux/slab.h>
+#include <linux/sched/hotplug.h>
 #include <linux/crash_dump.h>
 #include <linux/memblock.h>
 #include <asm/asm-offsets.h>

arch/sh/kernel/smp.c

@@ -21,6 +21,7 @@
 #include <linux/cpu.h>
 #include <linux/interrupt.h>
 #include <linux/sched.h>
+#include <linux/sched/hotplug.h>
 #include <linux/atomic.h>
 #include <linux/clockchips.h>
 #include <asm/processor.h>

arch/sparc/kernel/smp_64.c

@@ -6,6 +6,7 @@
 #include <linux/export.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
+#include <linux/sched/hotplug.h>
 #include <linux/mm.h>
 #include <linux/pagemap.h>
 #include <linux/threads.h>

arch/x86/kernel/smpboot.c

@@ -46,6 +46,7 @@
 #include <linux/export.h>
 #include <linux/sched.h>
 #include <linux/sched/topology.h>
+#include <linux/sched/hotplug.h>
 #include <linux/percpu.h>
 #include <linux/bootmem.h>
 #include <linux/err.h>

arch/xtensa/kernel/smp.c

@@ -21,6 +21,7 @@
 #include <linux/irq.h>
 #include <linux/kdebug.h>
 #include <linux/module.h>
+#include <linux/sched/hotplug.h>
 #include <linux/reboot.h>
 #include <linux/seq_file.h>
 #include <linux/smp.h>

include/linux/sched/hotplug.h

@@ -0,0 +1,6 @@
+#ifndef _LINUX_SCHED_HOTPLUG_H
+#define _LINUX_SCHED_HOTPLUG_H
+
+#include <linux/sched.h>
+
+#endif /* _LINUX_SCHED_HOTPLUG_H */

kernel/cpu.c

@@ -8,6 +8,7 @@
 #include <linux/init.h>
 #include <linux/notifier.h>
 #include <linux/sched/signal.h>
+#include <linux/sched/hotplug.h>
 #include <linux/unistd.h>
 #include <linux/cpu.h>
 #include <linux/oom.h>