diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 509cafea7ef0..bd66c23de3fb 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -812,7 +812,7 @@ config IOMMU_HELPER
 config MAXSMP
 	bool "Enable Maximum number of SMP Processors and NUMA Nodes"
 	depends on X86_64 && SMP && DEBUG_KERNEL
-	select CPUMASK_OFFSTACK
+	select CPUMASK_OFFSTACK if !PREEMPT_RT_FULL
 	---help---
 	  Enable maximum number of CPUS and NUMA Nodes for this architecture.
 	  If unsure, say N.
diff --git a/lib/Kconfig b/lib/Kconfig
index 991c98bc4a3f..d20e75d4a55b 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -357,6 +357,7 @@ config CHECK_SIGNATURE
 
 config CPUMASK_OFFSTACK
 	bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
+	depends on !PREEMPT_RT_FULL
 	help
 	  Use dynamic allocation for cpumask_var_t, instead of putting
 	  them on the stack.  This is a bit more expensive, but avoids