s390/asm-offsets: Remove ASM_OFFSETS_C

Remove ASM_OFFSETS_C which is used as guard in thread_info.h to decide if
asm-offsets can be included or not.

There is no reason to include asm-offsets.h in thread_info.h anymore.
Remove the define and the not needed include. Explicitly include
asm-offsets.h in all header files which require it, and where it used
to be included implicitly via thread_info.h.

This reduces header dependencies.

Acked-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

arch/s390/include/asm/thread_info.h

@@ -9,9 +9,6 @@
 #define _ASM_THREAD_INFO_H
 
 #include <linux/bits.h>
-#ifndef ASM_OFFSETS_C
-#include <asm/asm-offsets.h>
-#endif
 
 /*
  * General size of kernel stacks

arch/s390/kernel/asm-offsets.c

@@ -5,8 +5,6 @@
  * and format the required data.
  */
 
-#define ASM_OFFSETS_C
-
 #include <linux/kbuild.h>
 #include <linux/sched.h>
 #include <linux/purgatory.h>

arch/s390/kernel/dumpstack.c

@@ -17,6 +17,7 @@
 #include <linux/sched.h>
 #include <linux/sched/debug.h>
 #include <linux/sched/task_stack.h>
+#include <asm/asm-offsets.h>
 #include <asm/processor.h>
 #include <asm/debug.h>
 #include <asm/dis.h>

arch/s390/kernel/early.c

@@ -22,6 +22,7 @@
 #include <asm/asm-extable.h>
 #include <linux/memblock.h>
 #include <asm/access-regs.h>
+#include <asm/asm-offsets.h>
 #include <asm/machine.h>
 #include <asm/diag.h>
 #include <asm/ebcdic.h>

arch/s390/kernel/stacktrace.c

@@ -9,6 +9,7 @@
 #include <linux/stacktrace.h>
 #include <linux/uaccess.h>
 #include <linux/compat.h>
+#include <asm/asm-offsets.h>
 #include <asm/stacktrace.h>
 #include <asm/unwind.h>
 #include <asm/kprobes.h>

arch/s390/mm/pfault.c

@@ -9,6 +9,7 @@
 #include <linux/init.h>
 #include <linux/irq.h>
 #include <asm/asm-extable.h>
+#include <asm/asm-offsets.h>
 #include <asm/pfault.h>
 #include <asm/diag.h>