The header percpu.h header file is using raw_local_irq_save() but does not include irqflags.h for its definition. It compiles because the header file is included via an other header file. On -RT the build fails because raw_local_irq_save() is not defined. Include irqflags.h in percpu.h. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> --- include/asm-generic/percpu.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/asm-generic/percpu.h b/include/asm-generic/percpu.h index 1817a8415a5e8..942d64c0476e7 100644 --- a/include/asm-generic/percpu.h +++ b/include/asm-generic/percpu.h @@ -5,6 +5,7 @@ #include <linux/compiler.h> #include <linux/threads.h> #include <linux/percpu-defs.h> +#include <linux/irqflags.h> #ifdef CONFIG_SMP -- 2.19.1