[PATCH] x86/split_lock: Don't warn about unknown parameter

[Ronan Pigott <ronan@rjp.ie>]

The split_lock_detect command line parameter is handled in sld_setup
shortly after cpu_parse_early_param but still before parse_early_param.

Add a dummy __setup function so that parse_early_param doesn't later
complain about the "unknown" parameter split_lock_detect=, and pass it
along to init.
---
 arch/x86/kernel/cpu/bus_lock.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/kernel/cpu/bus_lock.c b/arch/x86/kernel/cpu/bus_lock.c
index fb166662bc0d..c8fec79ed557 100644
--- a/arch/x86/kernel/cpu/bus_lock.c
+++ b/arch/x86/kernel/cpu/bus_lock.c
@@ -132,6 +132,12 @@ static void __init sld_state_setup(void)
 	sld_state = state;
 }
 
+static __init int setup_split_lock_detect(char *arg)
+{
+	return 1;
+}
+__setup("split_lock_detect=", setup_split_lock_detect);
+
 static void __init __split_lock_setup(void)
 {
 	if (!split_lock_verify_msr(false)) {
-- 
2.53.0