1 files changed, 1 insertions, 0 deletions

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 84f3cdae440..8fb182956cb 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -645,6 +645,7 @@ static int __init idle_setup(char *str)
                 boot_option_idle_override = IDLE_POLL;
         } else if (!strcmp(str, "mwait")) {
                 boot_option_idle_override = IDLE_FORCE_MWAIT;
+                WARN_ONCE(1, "\idle=mwait\" will be removed in 2012\"\n");
         } else if (!strcmp(str, "halt")) {
                 /*
                  * When the boot option of idle=halt is added, halt is