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-rw-r--r--arch/x86/kernel/alternative.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 7038b95d363f..4db35544de73 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -620,7 +620,12 @@ static int __kprobes stop_machine_text_poke(void *data)
flush_icache_range((unsigned long)p->addr,
(unsigned long)p->addr + p->len);
}
-
+ /*
+ * Intel Archiecture Software Developer's Manual section 7.1.3 specifies
+ * that a core serializing instruction such as "cpuid" should be
+ * executed on _each_ core before the new instruction is made visible.
+ */
+ sync_core();
return 0;
}
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