1 files changed, 2 insertions, 2 deletions

diff --git a/arch/x86_64/kernel/irq.c b/arch/x86_64/kernel/irq.c
index 59518d4d4358..3be0a7e4bf08 100644
--- a/arch/x86_64/kernel/irq.c
+++ b/arch/x86_64/kernel/irq.c
@@ -115,8 +115,8 @@ skip:
  */
 asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
 {       
-        /* high bits used in ret_from_ code  */
-        unsigned irq = regs->orig_rax & 0xff;
+        /* high bit used in ret_from_ code  */
+        unsigned irq = ~regs->orig_rax;
 
         exit_idle();
         irq_enter();