diff --git a/arch/Kconfig b/arch/Kconfig
index 129df498a8e1..98db63496bab 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -1282,6 +1282,9 @@ config ARCH_SPLIT_ARG64
 config ARCH_HAS_ELFCORE_COMPAT
 	bool
 
+config ARCH_HAS_PARANOID_L1D_FLUSH
+	bool
+
 source "kernel/gcov/Kconfig"
 
 source "scripts/gcc-plugins/Kconfig"
diff --git a/include/linux/sched.h b/include/linux/sched.h
index ec8d07d88641..c048e59d3fbd 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1400,6 +1400,16 @@ struct task_struct {
 	struct llist_head               kretprobe_instances;
 #endif
 
+#ifdef CONFIG_ARCH_HAS_PARANOID_L1D_FLUSH
+	/*
+	 * If L1D flush is supported on mm context switch
+	 * then we use this callback head to queue kill work
+	 * to kill tasks that are not running on SMT disabled
+	 * cores
+	 */
+	struct callback_head		l1d_flush_kill;
+#endif
+
 	/*
 	 * New fields for task_struct should be added above here, so that
 	 * they are included in the randomized portion of task_struct.