diff --git a/arch/avr32/kernel/setup.c b/arch/avr32/kernel/setup.c
index e66a07a928cd6f7e10cb4798e61a46de75e492b3..2687b730e2d006a638492b303429cbcb767a313a 100644
--- a/arch/avr32/kernel/setup.c
+++ b/arch/avr32/kernel/setup.c
@@ -163,6 +163,7 @@ add_reserved_region(resource_size_t start, resource_size_t end,
 	new->start = start;
 	new->end = end;
 	new->name = name;
+	new->sibling = next;
 	new->flags = IORESOURCE_MEM;
 
 	*pprev = new;
diff --git a/arch/avr32/kernel/traps.c b/arch/avr32/kernel/traps.c
index cf6f686d9b0b4c97647316cd93a890930f100990..b835c4c0136882e8320ddde56fe14d98d3f1201c 100644
--- a/arch/avr32/kernel/traps.c
+++ b/arch/avr32/kernel/traps.c
@@ -178,6 +178,7 @@ static int do_cop_absent(u32 insn)
 	return 0;
 }
 
+#ifdef CONFIG_BUG
 int is_valid_bugaddr(unsigned long pc)
 {
 	unsigned short opcode;
@@ -189,6 +190,7 @@ int is_valid_bugaddr(unsigned long pc)
 
 	return opcode == AVR32_BUG_OPCODE;
 }
+#endif
 
 asmlinkage void do_illegal_opcode(unsigned long ecr, struct pt_regs *regs)
 {
@@ -197,6 +199,7 @@ asmlinkage void do_illegal_opcode(unsigned long ecr, struct pt_regs *regs)
 	void __user *pc;
 	long code;
 
+#ifdef CONFIG_BUG
 	if (!user_mode(regs) && (ecr == ECR_ILLEGAL_OPCODE)) {
 		enum bug_trap_type type;
 
@@ -211,6 +214,7 @@ asmlinkage void do_illegal_opcode(unsigned long ecr, struct pt_regs *regs)
 			die("Kernel BUG", regs, SIGKILL);
 		}
 	}
+#endif
 
 	local_irq_enable();
 
diff --git a/include/asm-avr32/byteorder.h b/include/asm-avr32/byteorder.h
index 402ff4125cdc25d570bf9f769045f6d17aa62b61..d77b48ba73387ba57ac932e5a6676d43b1c6a584 100644
--- a/include/asm-avr32/byteorder.h
+++ b/include/asm-avr32/byteorder.h
@@ -12,8 +12,14 @@ extern unsigned long __builtin_bswap_32(unsigned long x);
 extern unsigned short __builtin_bswap_16(unsigned short x);
 #endif
 
+/*
+ * avr32-linux-gcc versions earlier than 4.2 improperly sign-extends
+ * the result.
+ */
+#if !(__GNUC__ == 4 && __GNUC_MINOR__ < 2)
 #define __arch__swab32(x) __builtin_bswap_32(x)
 #define __arch__swab16(x) __builtin_bswap_16(x)
+#endif
 
 #if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
 # define __BYTEORDER_HAS_U64__