diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index e368fc0daa4a..6ae7fa4b8eb7 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2523,6 +2523,25 @@ config CPU_UNRET_ENTRY
 	help
 	  Compile the kernel with support for the retbleed=unret mitigation.
 
+config CALL_DEPTH_TRACKING
+	bool "Mitigate RSB underflow with call depth tracking"
+	depends on CPU_SUP_INTEL && HAVE_CALL_THUNKS
+	select HAVE_DYNAMIC_FTRACE_NO_PATCHABLE
+	select CALL_THUNKS
+	default y
+	help
+	  Compile the kernel with call depth tracking to mitigate the Intel
+	  SKL Return-Speculation-Buffer (RSB) underflow issue. The
+	  mitigation is off by default and needs to be enabled on the
+	  kernel command line via the retbleed=stuff option. For
+	  non-affected systems the overhead of this option is marginal as
+	  the call depth tracking is using run-time generated call thunks
+	  in a compiler generated padding area and call patching. This
+	  increases text size by ~5%. For non affected systems this space
+	  is unused. On affected SKL systems this results in a significant
+	  performance gain over the IBRS mitigation.
+
+
 config CPU_IBPB_ENTRY
 	bool "Enable IBPB on kernel entry"
 	depends on CPU_SUP_AMD && X86_64
diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index b71f4f2ecdd5..aefd0816a333 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -304,6 +304,7 @@
 #define X86_FEATURE_UNRET		(11*32+15) /* "" AMD BTB untrain return */
 #define X86_FEATURE_USE_IBPB_FW		(11*32+16) /* "" Use IBPB during runtime firmware calls */
 #define X86_FEATURE_RSB_VMEXIT_LITE	(11*32+17) /* "" Fill RSB on VM exit when EIBRS is enabled */
+#define X86_FEATURE_CALL_DEPTH		(11*32+18) /* "" Call depth tracking for RSB stuffing */
 
 /* Intel-defined CPU features, CPUID level 0x00000007:1 (EAX), word 12 */
 #define X86_FEATURE_AVX_VNNI		(12*32+ 4) /* AVX VNNI instructions */
diff --git a/arch/x86/include/asm/disabled-features.h b/arch/x86/include/asm/disabled-features.h
index 33d2cd04d254..bbb03b25263e 100644
--- a/arch/x86/include/asm/disabled-features.h
+++ b/arch/x86/include/asm/disabled-features.h
@@ -69,6 +69,12 @@
 # define DISABLE_UNRET		(1 << (X86_FEATURE_UNRET & 31))
 #endif
 
+#ifdef CONFIG_CALL_DEPTH_TRACKING
+# define DISABLE_CALL_DEPTH_TRACKING	0
+#else
+# define DISABLE_CALL_DEPTH_TRACKING	(1 << (X86_FEATURE_CALL_DEPTH & 31))
+#endif
+
 #ifdef CONFIG_INTEL_IOMMU_SVM
 # define DISABLE_ENQCMD		0
 #else
@@ -101,7 +107,8 @@
 #define DISABLED_MASK8	(DISABLE_TDX_GUEST)
 #define DISABLED_MASK9	(DISABLE_SGX)
 #define DISABLED_MASK10	0
-#define DISABLED_MASK11	(DISABLE_RETPOLINE|DISABLE_RETHUNK|DISABLE_UNRET)
+#define DISABLED_MASK11	(DISABLE_RETPOLINE|DISABLE_RETHUNK|DISABLE_UNRET| \
+			 DISABLE_CALL_DEPTH_TRACKING)
 #define DISABLED_MASK12	0
 #define DISABLED_MASK13	0
 #define DISABLED_MASK14	0