[PATCH] make kstack_depth_to_print and some APM stuff static

Tridge has written a little utility
(http://samba.org/ftp/unpacked/junkcode/findstatic.pl) that (given a set of
object files) works out a list of candidate finctions and variables that
may be able to be made static.  Obviously some hand checking is needed
(different configs and/or architectures etc), but it seems useful.

Here is my first patch using its outout.

kstack_depth_to_print is used in many architectures, but only in one
file in each.  In some architectures it is declared and not used.  It
is not even clear why kstack_depth_to_print is not a #define.  Tridge
suggested that maybe you could change its value with a debugger ...

The APM code has a function and a struct that can be static.

arch/alpha/kernel/traps.c

@@ -141,7 +141,7 @@ void show_trace_task(struct task_struct * tsk)
 	}
 }
 
-int kstack_depth_to_print = 24;
+static int kstack_depth_to_print = 24;
 
 void show_stack(unsigned long *sp)
 {

arch/cris/kernel/traps.c

@@ -28,7 +28,7 @@
 #include <asm/io.h>
 #include <asm/pgtable.h>
 
-int kstack_depth_to_print = 24;
+static int kstack_depth_to_print = 24;
 
 void show_trace(unsigned long * stack)
 {

arch/i386/kernel/apm.c

@@ -922,12 +922,13 @@ static void apm_power_off(void)
  * callback we use.
  */
 
-void handle_poweroff (int key, struct pt_regs *pt_regs,
-		struct kbd_struct *kbd, struct tty_struct *tty) {
+static void handle_poweroff (int key, struct pt_regs *pt_regs,
+		struct kbd_struct *kbd, struct tty_struct *tty)
+{
         apm_power_off();
 }
 
-struct sysrq_key_op	sysrq_poweroff_op = {
+static struct sysrq_key_op	sysrq_poweroff_op = {
 	handler:        handle_poweroff,
 	help_msg:       "Off",
 	action_msg:     "Power Off\n"

arch/i386/kernel/traps.c

@@ -89,7 +89,7 @@ asmlinkage void alignment_check(void);
 asmlinkage void spurious_interrupt_bug(void);
 asmlinkage void machine_check(void);
 
-int kstack_depth_to_print = 24;
+static int kstack_depth_to_print = 24;
 
 
 /*

arch/m68k/kernel/traps.c

@@ -815,7 +815,7 @@ asmlinkage void buserr_c(struct frame *fp)
 }
 
 
-int kstack_depth_to_print = 48;
+static int kstack_depth_to_print = 48;
 extern struct module kernel_module;
 
 static inline int kernel_text_address(unsigned long addr)

arch/mips/kernel/traps.c

@@ -69,8 +69,6 @@ char watch_available = 0;
 void (*ibe_board_handler)(struct pt_regs *regs);
 void (*dbe_board_handler)(struct pt_regs *regs);
 
-int kstack_depth_to_print = 24;
-
 /*
  * These constant is for searching for possible module text segments.
  * MODULE_RANGE is a guess of how much space is likely to be vmalloced.

arch/mips64/kernel/traps.c

@@ -51,8 +51,6 @@ char dedicated_iv_available = 0;
 char vce_available = 0;
 char mips4_available = 0;
 
-int kstack_depth_to_print = 24;
-
 /*
  * These constant is for searching for possible module text segments.
  * MODULE_RANGE is a guess of how much space is likely to be vmalloced.

arch/parisc/kernel/traps.c

@@ -58,8 +58,6 @@ void page_exception(void);
 #define VMALLOC_OFFSET (8*1024*1024)
 #define MODULE_RANGE (8*1024*1024)
 
-int kstack_depth_to_print = 24;
-
 static void printbinary(unsigned long x, int nbits)
 {
 	unsigned long mask = 1UL << (nbits - 1);

arch/s390/kernel/traps.c

@@ -61,7 +61,7 @@ extern void pfault_interrupt(struct pt_regs *regs, __u16 error_code);
 static ext_int_info_t ext_int_pfault;
 #endif
 
-int kstack_depth_to_print = 12;
+static int kstack_depth_to_print = 12;
 
 /*
  * If the address is either in the .text section of the

arch/s390x/kernel/traps.c

@@ -63,7 +63,7 @@ extern void pfault_interrupt(struct pt_regs *regs, __u16 error_code);
 static ext_int_info_t ext_int_pfault;
 #endif
 
-int kstack_depth_to_print = 20;
+static int kstack_depth_to_print = 20;
 
 /*
  * If the address is either in the .text section of the

arch/x86_64/kernel/traps.c

@@ -81,7 +81,7 @@ extern int exception_trace;
 
 struct notifier_block *die_chain;
 
-int kstack_depth_to_print = 10;
+static int kstack_depth_to_print = 10;
 
 #ifdef CONFIG_KALLSYMS
 #include <linux/kallsyms.h>