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-rw-r--r--sys/amd64/include/smp.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/sys/amd64/include/smp.h b/sys/amd64/include/smp.h
index d669c51..ef5e684 100644
--- a/sys/amd64/include/smp.h
+++ b/sys/amd64/include/smp.h
@@ -21,6 +21,9 @@
#if defined(SMP) && !defined(APIC_IO)
# error APIC_IO required for SMP, add "options APIC_IO" to your config file.
#endif /* SMP && !APIC_IO */
+#if defined(SMP) && defined(CPU_DISABLE_CMPXCHG)
+#error SMP not supported with CPU_DISABLE_CMPXCHG
+#endif
#if defined(SMP) || defined(APIC_IO)
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