signals: Prepare to split out <linux/signal_types.h> from <linux/signal.h>

Introduce dummy header and add dependencies to places that will depend on 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>
diff --git a/arch/mips/include/asm/abi.h b/arch/mips/include/asm/abi.h
index 9407608..dba7f4b 100644
--- a/arch/mips/include/asm/abi.h
+++ b/arch/mips/include/asm/abi.h
@@ -9,6 +9,8 @@
 #ifndef _ASM_ABI_H
 #define _ASM_ABI_H
 
+#include <linux/signal_types.h>
+
 #include <asm/signal.h>
 #include <asm/siginfo.h>
 #include <asm/vdso.h>
diff --git a/include/linux/signal.h b/include/linux/signal.h
index 5308304..d1c2b05 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -1,9 +1,8 @@
 #ifndef _LINUX_SIGNAL_H
 #define _LINUX_SIGNAL_H
 
-#include <linux/list.h>
 #include <linux/bug.h>
-#include <uapi/linux/signal.h>
+#include <linux/signal_types.h>
 
 struct task_struct;
 
diff --git a/include/linux/signal_types.h b/include/linux/signal_types.h
new file mode 100644
index 0000000..28799c8
--- /dev/null
+++ b/include/linux/signal_types.h
@@ -0,0 +1,7 @@
+#ifndef _LINUX_SIGNAL_TYPES_H
+#define _LINUX_SIGNAL_TYPES_H
+
+#include <linux/list.h>
+#include <uapi/linux/signal.h>
+
+#endif /* _LINUX_SIGNAL_TYPES_H */