4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> commit 1f59a4581b5ecfe9b4f049a7a2cf904d8352842d upstream. This should have been marked extern inline in order to pick up the out of line definition in arch/x86/kernel/irqflags.S. Fixes: 208cbb325589 ("x86/irqflags: Provide a declaration for native_save_fl") Reported-by: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx> Signed-off-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Reviewed-by: Juergen Gross <jgross@xxxxxxxx> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx> Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Link: https://lkml.kernel.org/r/20180827214011.55428-1-ndesaulniers@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/x86/include/asm/irqflags.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/arch/x86/include/asm/irqflags.h +++ b/arch/x86/include/asm/irqflags.h @@ -28,7 +28,8 @@ extern inline unsigned long native_save_ return flags; } -static inline void native_restore_fl(unsigned long flags) +extern inline void native_restore_fl(unsigned long flags); +extern inline void native_restore_fl(unsigned long flags) { asm volatile("push %0 ; popf" : /* no output */