--- zzzz-none-000/linux-4.19.183/arch/arm/mm/proc-macros.S	2021-03-24 10:07:39.000000000 +0000
+++ bcm63-7530ax-756/linux-4.19.183/arch/arm/mm/proc-macros.S	2023-06-28 08:54:18.000000000 +0000
@@ -386,3 +386,11 @@
 	orr	\dest, \addr, \dest, lsl #1	@ mask in the region size
 	orr	\dest, \dest, \enable
 .endm
+
+#if defined(CONFIG_BCM_KF_ARM_BCM963XX) && defined(CONFIG_BCM_B15_MEGA_BARRIER)
+.macro issue_mega_barrier
+	stmfd	sp!,{r3,lr}
+	blx	BcmMegaBarrier
+	ldmfd	sp!,{r3,lr}
+.endm
+#endif