From: Ronan Pigott <ronan@rjp.ie>
Date: Sun, 5 Apr 2026 17:28:25 +0000 (-0700)
Subject: x86/split_lock: Don't warn about unknown split_lock_detect parameter
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=fbe80bd6993a059ca366a3561051b419f3cd2b29;p=thirdparty%2Flinux.git

x86/split_lock: Don't warn about unknown split_lock_detect parameter

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 parsing function so that parse_early_param() doesn't later
complain about the "unknown" parameter split_lock_detect=, and pass it along
to init.

  [ bp: Massage commit message. ]

Signed-off-by: Ronan Pigott <ronan@rjp.ie>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20260405181807.3906-1-ronan@rjp.ie
---

diff --git a/arch/x86/kernel/cpu/bus_lock.c b/arch/x86/kernel/cpu/bus_lock.c
index 660aa9aa8bec2..bba28607a59a6 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)) {