diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 2c2ac3f..689ccb3 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -468,6 +468,14 @@ config ARCH_PHYS_ADDR_T_64BIT
 config ARCH_DMA_ADDR_T_64BIT
 	bool
 
+config ARC_VMALLOC_SIZE
+	hex "Vmalloc size (MB)"
+	range 0 512
+	default "256"
+	help
+	  By default equals to 256MB and the rest of 512MB is
+	  left for gutter between kernel and user space.
+
 config ARC_CURR_IN_REG
 	bool "Dedicate Register r25 for current_task pointer"
 	default y
diff --git a/arch/arc/include/asm/pgtable.h b/arch/arc/include/asm/pgtable.h
index 57af2f0..372a282 100644
--- a/arch/arc/include/asm/pgtable.h
+++ b/arch/arc/include/asm/pgtable.h
@@ -210,7 +210,7 @@
 #define BITS_FOR_PGD	(32 - BITS_FOR_PTE - BITS_IN_PAGE)
 
 #define PGDIR_SHIFT	(32 - BITS_FOR_PGD)
-#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)	/* vaddr span, not PDG sz */
+#define PGDIR_SIZE	_BITUL(PGDIR_SHIFT)	/* vaddr span, not PDG sz */
 #define PGDIR_MASK	(~(PGDIR_SIZE-1))
 
 #define	PTRS_PER_PTE	_BITUL(BITS_FOR_PTE)
diff --git a/arch/arc/include/asm/processor.h b/arch/arc/include/asm/processor.h
index 1d694c1..8a77ccd 100644
--- a/arch/arc/include/asm/processor.h
+++ b/arch/arc/include/asm/processor.h
@@ -109,18 +109,18 @@ extern unsigned int get_wchan(struct task_struct *p);
  * 0xC000_0000		0xFFFF_FFFF	(peripheral uncached space)
  * -----------------------------------------------------------------------------
  */
-#define VMALLOC_START	0x70000000
 
 /*
  * 1 PGDIR_SIZE each for fixmap/pkmap, 2 PGDIR_SIZE gutter
  * See asm/highmem.h for details
  */
-#define VMALLOC_SIZE	(PAGE_OFFSET - VMALLOC_START - PGDIR_SIZE * 4)
-#define VMALLOC_END	(VMALLOC_START + VMALLOC_SIZE)
+#define VMALLOC_END	(PAGE_OFFSET - PGDIR_SIZE * 4)
+#define VMALLOC_SIZE	(CONFIG_ARC_VMALLOC_SIZE << 20)
+#define VMALLOC_START	(VMALLOC_END - VMALLOC_SIZE)
 
-#define USER_KERNEL_GUTTER    0x10000000
+#define TASK_SIZE	0x60000000
 
-#define TASK_SIZE	(VMALLOC_START - USER_KERNEL_GUTTER)
+#define USER_KERNEL_GUTTER    (VMALLOC_START - TASK_SIZE)
 
 #define STACK_TOP       TASK_SIZE
 #define STACK_TOP_MAX   STACK_TOP
diff --git a/arch/arc/mm/tlb.c b/arch/arc/mm/tlb.c
index daf2bf5..843e1a5 100644
--- a/arch/arc/mm/tlb.c
+++ b/arch/arc/mm/tlb.c
@@ -814,6 +814,12 @@ void arc_mmu_init(void)
 
 	printk(arc_mmu_mumbojumbo(0, str, sizeof(str)));
 
+	/*
+	 * vmalloc size (in MB) sanity check,
+	 * Can't be done in processor.h due to header include depenedencies
+	 */
+	BUILD_BUG_ON(!IS_ALIGNED((CONFIG_ARC_VMALLOC_SIZE << 20), PMD_SIZE));
+
 	/* For efficiency sake, kernel is compile time built for a MMU ver
 	 * This must match the hardware it is running on.
 	 * Linux built for MMU V2, if run on MMU V1 will break down because V1