kgdb: fix signedness mixmatches, add statics, add declaration to header

Noticed by sparse:
arch/x86/kernel/kgdb.c:556:15: warning: symbol 'kgdb_arch_pc' was not declared. Should it be static?
kernel/kgdb.c:149:8: warning: symbol 'kgdb_do_roundup' was not declared. Should it be static?
kernel/kgdb.c:193:22: warning: symbol 'kgdb_arch_pc' was not declared. Should it be static?
kernel/kgdb.c:712:5: warning: symbol 'remove_all_break' was not declared. Should it be static?

Related to kgdb_hex2long:
arch/x86/kernel/kgdb.c:371:28: warning: incorrect type in argument 2 (different signedness)
arch/x86/kernel/kgdb.c:371:28:    expected long *long_val
arch/x86/kernel/kgdb.c:371:28:    got unsigned long *<noident>
kernel/kgdb.c:469:27: warning: incorrect type in argument 2 (different signedness)
kernel/kgdb.c:469:27:    expected long *long_val
kernel/kgdb.c:469:27:    got unsigned long *<noident>
kernel/kgdb.c:470:27: warning: incorrect type in argument 2 (different signedness)
kernel/kgdb.c:470:27:    expected long *long_val
kernel/kgdb.c:470:27:    got unsigned long *<noident>
kernel/kgdb.c:894:27: warning: incorrect type in argument 2 (different signedness)
kernel/kgdb.c:894:27:    expected long *long_val
kernel/kgdb.c:894:27:    got unsigned long *<noident>
kernel/kgdb.c:895:27: warning: incorrect type in argument 2 (different signedness)
kernel/kgdb.c:895:27:    expected long *long_val
kernel/kgdb.c:895:27:    got unsigned long *<noident>
kernel/kgdb.c:1127:28: warning: incorrect type in argument 2 (different signedness)
kernel/kgdb.c:1127:28:    expected long *long_val
kernel/kgdb.c:1127:28:    got unsigned long *<noident>
kernel/kgdb.c:1132:25: warning: incorrect type in argument 2 (different signedness)
kernel/kgdb.c:1132:25:    expected long *long_val
kernel/kgdb.c:1132:25:    got unsigned long *<noident>

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>

include/linux/kgdb.h

@@ -261,10 +261,12 @@ struct kgdb_io {
 
 extern struct kgdb_arch		arch_kgdb_ops;
 
+extern unsigned long __weak kgdb_arch_pc(int exception, struct pt_regs *regs);
+
 extern int kgdb_register_io_module(struct kgdb_io *local_kgdb_io_ops);
 extern void kgdb_unregister_io_module(struct kgdb_io *local_kgdb_io_ops);
 
-extern int kgdb_hex2long(char **ptr, long *long_val);
+extern int kgdb_hex2long(char **ptr, unsigned long *long_val);
 extern int kgdb_mem2hex(char *mem, char *buf, int count);
 extern int kgdb_hex2mem(char *buf, char *mem, int count);
 

kernel/kgdb.c

@@ -61,7 +61,7 @@ struct kgdb_state {
 	int			err_code;
 	int			cpu;
 	int			pass_exception;
-	long			threadid;
+	unsigned long		threadid;
 	long			kgdb_usethreadid;
 	struct pt_regs		*linux_regs;
 };
@@ -146,7 +146,7 @@ atomic_t			kgdb_cpu_doing_single_step = ATOMIC_INIT(-1);
  * the other CPUs might interfere with your debugging context, so
  * use this with care:
  */
-int				kgdb_do_roundup = 1;
+static int kgdb_do_roundup = 1;
 
 static int __init opt_nokgdbroundup(char *str)
 {
@@ -438,7 +438,7 @@ int kgdb_hex2mem(char *buf, char *mem, int count)
  * While we find nice hex chars, build a long_val.
  * Return number of chars processed.
  */
-int kgdb_hex2long(char **ptr, long *long_val)
+int kgdb_hex2long(char **ptr, unsigned long *long_val)
 {
 	int hex_val;
 	int num = 0;
@@ -709,7 +709,7 @@ int kgdb_isremovedbreak(unsigned long addr)
 	return 0;
 }
 
-int remove_all_break(void)
+static int remove_all_break(void)
 {
 	unsigned long addr;
 	int error;