Hi Sasha, I see the following build errors with v4.1.40-200-gee0553e. arm: arch/arm/mach-omap2/omap-headsmp.S: Assembler messages: arch/arm/mach-omap2/omap-headsmp.S:60: Error: bad instruction `badr r0,hyp_boot' If I recall correctly, badr is a macro which was only declared in a later kernel version. mips: arch/mips/kernel/genex.S: Assembler messages: arch/mips/kernel/genex.S:219: Error: absolute expression required `li $9,_IRQ_STACK_SIZE' arch/mips/kernel/genex.S:329: Error: absolute expression required `li $9,_IRQ_STACK_SIZE' arch/mips/kernel/process.c: In function 'unwind_stack': arch/mips/kernel/process.c:560:3: error: implicit declaration of function 'on_irq_stack' arch/mips/kernel/process.c:561:32: error: 'irq_stack' undeclared nios2: arch/nios2/kernel/setup.c: In function ‘setup_arch’: arch/nios2/kernel/setup.c:198:2: error: implicit declaration of function ‘early_init_fdt_reserve_self’ Guenter