kgdb,arm: fix register dump

DBG_MAX_REG_NUM incorrectly had the number of indices in the GDB regs
array rather than the number of registers, leading to an oops when the
"rd" command is used in KDB.

Cc: stable@kernel.org
Signed-off-by: NRabin Vincent <rabin@rab.in>
Signed-off-by: NJason Wessel <jason.wessel@windriver.com>

arch/arm/include/asm/kgdb.h

@@ -70,7 +70,8 @@ extern int kgdb_fault_expected;
 #define _GP_REGS		16
 #define _FP_REGS		8
 #define _EXTRA_REGS		2
-#define DBG_MAX_REG_NUM		(_GP_REGS + (_FP_REGS * 3) + _EXTRA_REGS)
+#define GDB_MAX_REGS		(_GP_REGS + (_FP_REGS * 3) + _EXTRA_REGS)
+#define DBG_MAX_REG_NUM		(_GP_REGS + _FP_REGS + _EXTRA_REGS)
 
 #define KGDB_MAX_NO_CPUS	1
 #define BUFMAX			400
@@ -93,7 +94,7 @@ extern int kgdb_fault_expected;
 #define _SPT			13
 #define _LR			14
 #define _PC			15
-#define _CPSR			(DBG_MAX_REG_NUM - 1)
+#define _CPSR			(GDB_MAX_REGS - 1)
 
 /*
  * So that we can denote the end of a frame for tracing,

arch/arm/kernel/kgdb.c

@@ -79,7 +79,7 @@ sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task)
 		return;
 
 	/* Initialize to zero */
-	for (regno = 0; regno < DBG_MAX_REG_NUM; regno++)
+	for (regno = 0; regno < GDB_MAX_REGS; regno++)
 		gdb_regs[regno] = 0;
 
 	/* Otherwise, we have only some registers from switch_to() */