Merge tag 'x86_urgent_for_v6.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 rethunk fixes from Borislav Petkov:
 "Fix the patching ordering between static calls and return thunks"

* tag 'x86_urgent_for_v6.6-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86,static_call: Fix static-call vs return-thunk
  x86/alternatives: Remove faulty optimization

Author: torvalds

arch/x86/kernel/alternative.c

@@ -720,13 +720,8 @@ void __init_or_module noinline apply_returns(s32 *start, s32 *end)
 {
 	s32 *s;
 
-	/*
-	 * Do not patch out the default return thunks if those needed are the
-	 * ones generated by the compiler.
-	 */
-	if (cpu_feature_enabled(X86_FEATURE_RETHUNK) &&
-	    (x86_return_thunk == __x86_return_thunk))
-		return;
+	if (cpu_feature_enabled(X86_FEATURE_RETHUNK))
+		static_call_force_reinit();
 
 	for (s = start; s < end; s++) {
 		void *dest = NULL, *addr = (void *)s + *s;

arch/x86/kernel/callthunks.c

@@ -272,7 +272,6 @@ void __init callthunks_patch_builtin_calls(void)
 	pr_info("Setting up call depth tracking\n");
 	mutex_lock(&text_mutex);
 	callthunks_setup(&cs, &builtin_coretext);
-	static_call_force_reinit();
 	thunks_initialized = true;
 	mutex_unlock(&text_mutex);
 }