1 files changed, 50 insertions, 0 deletions

diff --git a/arch/x86/kernel/jump_label.c b/arch/x86/kernel/jump_label.c
new file mode 100644
index 000000000000..961b6b30ba90
--- /dev/null
+++ b/arch/x86/kernel/jump_label.c
@@ -0,0 +1,50 @@
+/*
+ * jump label x86 support
+ *
+ * Copyright (C) 2009 Jason Baron <jbaron@redhat.com>
+ *
+ */
+#include <linux/jump_label.h>
+#include <linux/memory.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/jhash.h>
+#include <linux/cpu.h>
+#include <asm/kprobes.h>
+#include <asm/alternative.h>
+
+#ifdef HAVE_JUMP_LABEL
+
+union jump_code_union {
+        char code[JUMP_LABEL_NOP_SIZE];
+        struct {
+                char jump;
+                int offset;
+        } __attribute__((packed));
+};
+
+void arch_jump_label_transform(struct jump_entry *entry,
+                               enum jump_label_type type)
+{
+        union jump_code_union code;
+
+        if (type == JUMP_LABEL_ENABLE) {
+                code.jump = 0xe9;
+                code.offset = entry->target -
+                                (entry->code + JUMP_LABEL_NOP_SIZE);
+        } else
+                memcpy(&code, ideal_nop5, JUMP_LABEL_NOP_SIZE);
+        get_online_cpus();
+        mutex_lock(&text_mutex);
+        text_poke_smp((void *)entry->code, &code, JUMP_LABEL_NOP_SIZE);
+        mutex_unlock(&text_mutex);
+        put_online_cpus();
+}
+
+void arch_jump_label_text_poke_early(jump_label_t addr)
+{
+        text_poke_early((void *)addr, ideal_nop5, JUMP_LABEL_NOP_SIZE);
+}
+
+#endif