1 files changed, 24 insertions, 51 deletions

diff --git a/arch/s390/kernel/alternative.c b/arch/s390/kernel/alternative.c
index 1ac5f707dd70..8d5d0de35de0 100644
--- a/arch/s390/kernel/alternative.c
+++ b/arch/s390/kernel/alternative.c
@@ -1,68 +1,41 @@
 // SPDX-License-Identifier: GPL-2.0
-#include <linux/module.h>
-#include <linux/cpu.h>
-#include <linux/smp.h>
-#include <asm/text-patching.h>
+
+#include <linux/uaccess.h>
+#include <asm/nospec-branch.h>
+#include <asm/abs_lowcore.h>
 #include <asm/alternative.h>
 #include <asm/facility.h>
-#include <asm/nospec-branch.h>
-
-static int __initdata_or_module alt_instr_disabled;
-
-static int __init disable_alternative_instructions(char *str)
-{
-	alt_instr_disabled = 1;
-	return 0;
-}
-
-early_param("noaltinstr", disable_alternative_instructions);
 
-static void __init_or_module __apply_alternatives(struct alt_instr *start,
-						  struct alt_instr *end)
+void __apply_alternatives(struct alt_instr *start, struct alt_instr *end, unsigned int ctx)
 {
-	struct alt_instr *a;
 	u8 *instr, *replacement;
+	struct alt_instr *a;
+	bool replace;
 
 	/*
 	 * The scan order should be from start to end. A later scanned
 	 * alternative code can overwrite previously scanned alternative code.
 	 */
 	for (a = start; a < end; a++) {
+		if (!(a->ctx & ctx))
+			continue;
+		switch (a->type) {
+		case ALT_TYPE_FACILITY:
+			replace = test_facility(a->data);
+			break;
+		case ALT_TYPE_SPEC:
+			replace = nobp_enabled();
+			break;
+		case ALT_TYPE_LOWCORE:
+			replace = have_relocated_lowcore();
+			break;
+		default:
+			replace = false;
+		}
+		if (!replace)
+			continue;
 		instr = (u8 *)&a->instr_offset + a->instr_offset;
 		replacement = (u8 *)&a->repl_offset + a->repl_offset;
-
-		if (!__test_facility(a->facility, alt_stfle_fac_list))
-			continue;
 		s390_kernel_write(instr, replacement, a->instrlen);
 	}
 }
-
-void __init_or_module apply_alternatives(struct alt_instr *start,
-					 struct alt_instr *end)
-{
-	if (!alt_instr_disabled)
-		__apply_alternatives(start, end);
-}
-
-extern struct alt_instr __alt_instructions[], __alt_instructions_end[];
-void __init apply_alternative_instructions(void)
-{
-	apply_alternatives(__alt_instructions, __alt_instructions_end);
-}
-
-static void do_sync_core(void *info)
-{
-	sync_core();
-}
-
-void text_poke_sync(void)
-{
-	on_each_cpu(do_sync_core, NULL, 1);
-}
-
-void text_poke_sync_lock(void)
-{
-	cpus_read_lock();
-	text_poke_sync();
-	cpus_read_unlock();
-}