avr32: Move stack_end to arch_global_data

Move this field into arch_global_data and tidy up.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/avr32/cpu/exception.c b/arch/avr32/cpu/exception.c
index b21ef1f..828fc00 100644
--- a/arch/avr32/cpu/exception.c
+++ b/arch/avr32/cpu/exception.c
@@ -112,11 +112,11 @@
 	printf("CPU Mode: %s\n", cpu_modes[mode]);
 
 	/* Avoid exception loops */
-	if (regs->sp < (gd->stack_end - CONFIG_STACKSIZE)
-			|| regs->sp >= gd->stack_end)
+	if (regs->sp < (gd->arch.stack_end - CONFIG_STACKSIZE)
+			|| regs->sp >= gd->arch.stack_end)
 		printf("\nStack pointer seems bogus, won't do stack dump\n");
 	else
-		dump_mem("\nStack: ", regs->sp, gd->stack_end);
+		dump_mem("\nStack: ", regs->sp, gd->arch.stack_end);
 
 	panic("Unhandled exception\n");
 }
diff --git a/arch/avr32/include/asm/global_data.h b/arch/avr32/include/asm/global_data.h
index 236a9da..3be8628 100644
--- a/arch/avr32/include/asm/global_data.h
+++ b/arch/avr32/include/asm/global_data.h
@@ -24,6 +24,7 @@
 
 /* Architecture-specific global data */
 struct arch_global_data {
+	unsigned long stack_end;	/* highest stack address */
 };
 
 /*
@@ -38,7 +39,6 @@
 	bd_t		*bd;
 	unsigned long	flags;
 	unsigned int	baudrate;
-	unsigned long	stack_end;	/* highest stack address */
 	unsigned long	have_console;	/* serial_init() was called */
 #ifdef CONFIG_PRE_CONSOLE_BUFFER
 	unsigned long	precon_buf_idx;	/* Pre-Console buffer index */
diff --git a/arch/avr32/lib/board.c b/arch/avr32/lib/board.c
index e3287c4..d3c8cb7 100644
--- a/arch/avr32/lib/board.c
+++ b/arch/avr32/lib/board.c
@@ -231,7 +231,7 @@
 
 	/* And finally, a new, bigger stack. */
 	new_sp = (unsigned long *)addr;
-	gd->stack_end = addr;
+	gd->arch.stack_end = addr;
 	*(--new_sp) = 0;
 	*(--new_sp) = 0;