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

We are going to split <linux/sched/signal.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/signal.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 <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Signed-off-by: Ingo Molnar <[email protected]>

arch/sh/kernel/cpu/sh2a/fpu.c

@@ -9,7 +9,7 @@
  *
  * FIXME! These routines can be optimized in big endian case.
  */
-#include <linux/sched.h>
+#include <linux/sched/signal.h>
 #include <linux/signal.h>
 #include <asm/processor.h>
 #include <asm/io.h>

arch/sh/kernel/hw_breakpoint.c

@@ -11,6 +11,7 @@
  */
 #include <linux/init.h>
 #include <linux/perf_event.h>
+#include <linux/sched/signal.h>
 #include <linux/hw_breakpoint.h>
 #include <linux/percpu.h>
 #include <linux/kallsyms.h>

arch/sh/kernel/traps.c

@@ -8,6 +8,8 @@
 #include <linux/hardirq.h>
 #include <linux/kernel.h>
 #include <linux/kexec.h>
+#include <linux/sched/signal.h>
+
 #include <linux/extable.h>
 #include <linux/module.h>	/* print_modules */
 #include <asm/unwinder.h>

arch/sh/math-emu/math.c

@@ -10,7 +10,7 @@
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/types.h>
-#include <linux/sched.h>
+#include <linux/sched/signal.h>
 #include <linux/signal.h>
 #include <linux/perf_event.h>
 

arch/sh/mm/asids-debugfs.c

@@ -20,6 +20,8 @@
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>
 #include <linux/spinlock.h>
+#include <linux/sched/signal.h>
+
 #include <asm/processor.h>
 #include <asm/mmu_context.h>
 

arch/sh/mm/fault.c

@@ -13,6 +13,7 @@
  */
 #include <linux/kernel.h>
 #include <linux/mm.h>
+#include <linux/sched/signal.h>
 #include <linux/hardirq.h>
 #include <linux/kprobes.h>
 #include <linux/perf_event.h>