New kernel option nowait allows disabling the use of the wait instruction.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index e40bd6fccea..53e4496de6b 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -71,11 +71,27 @@ static void au1k_wait(void)
                 : : "r" (au1k_wait));
 }
 
+static int __initdata nowait = 0;
+
+int __init wait_disable(char *s)
+{
+        nowait = 1;
+
+        return 1;
+}
+
+__setup("nowait", wait_disable);
+
 static inline void check_wait(void)
 {
         struct cpuinfo_mips *c = &current_cpu_data;
 
         printk("Checking for 'wait' instruction... ");
+        if (nowait) {
+                printk (" disabled.\n");
+                return;
+        }
+
         switch (c->cputype) {
         case CPU_R3081:
         case CPU_R3081E: