diff --git a/arch/arc/include/asm/entry.h b/arch/arc/include/asm/entry.h
index 5bbec8ad8123..2b274fa9c5a7 100644
--- a/arch/arc/include/asm/entry.h
+++ b/arch/arc/include/asm/entry.h
@@ -252,7 +252,7 @@
 	ld  \out, [\tsk, TASK_THREAD_INFO]
 
 	/* Go to end of page where stack begins (grows upwards) */
-	add2 \out, \out, (THREAD_SIZE - 4)/4   /* one word GUTTER */
+	add2 \out, \out, (THREAD_SIZE)/4
 
 .endm
 
diff --git a/arch/arc/include/asm/processor.h b/arch/arc/include/asm/processor.h
index 5f26b2c1cba0..81efbcae3839 100644
--- a/arch/arc/include/asm/processor.h
+++ b/arch/arc/include/asm/processor.h
@@ -50,7 +50,7 @@ struct task_struct;
 unsigned long thread_saved_pc(struct task_struct *t);
 
 #define task_pt_regs(p) \
-	((struct pt_regs *)(THREAD_SIZE - 4 + (void *)task_stack_page(p)) - 1)
+	((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)
 
 /* Free all resources held by a thread. */
 #define release_thread(thread) do { } while (0)
diff --git a/arch/arc/include/asm/ptrace.h b/arch/arc/include/asm/ptrace.h
index 6179de7e07c2..f82a3a2201b5 100644
--- a/arch/arc/include/asm/ptrace.h
+++ b/arch/arc/include/asm/ptrace.h
@@ -110,7 +110,7 @@ struct callee_regs {
 	/* open-coded current_thread_info() */			\
 	register unsigned long sp asm ("sp");			\
 	unsigned long pg_start = (sp & ~(THREAD_SIZE - 1));	\
-	(struct pt_regs *)(pg_start + THREAD_SIZE - 4) - 1;	\
+	(struct pt_regs *)(pg_start + THREAD_SIZE) - 1;	\
 })
 
 static inline long regs_return_value(struct pt_regs *regs)
diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c
index cad66851e0c4..949bfd5d62a0 100644
--- a/arch/arc/kernel/process.c
+++ b/arch/arc/kernel/process.c
@@ -75,8 +75,6 @@ asmlinkage void ret_from_fork(void);
  * ~                ~
  * |    --to--      |   (scratch Regs of user mode)
  * |     r0         |
- * ------------------
- * |   UNUSED 1 word|
  * ------------------  <===== END of PAGE
  */
 int copy_thread(unsigned long clone_flags,