xtensa: clean up PS_WOE_BIT usage

PS_WOE_BIT is mainly used to generate PS.WOE mask in the code. Introduce
PS_WOE_MASK macro and use it instead.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

arch/xtensa/include/asm/processor.h

@@ -179,7 +179,7 @@ struct thread_struct {
  * Note: We set-up ps as if we did a call4 to the new pc.
  *       set_thread_state in signal.c depends on it.
  */
-#define USER_PS_VALUE ((1 << PS_WOE_BIT) |				\
+#define USER_PS_VALUE (PS_WOE_MASK |					\
 		       (1 << PS_CALLINC_SHIFT) |			\
 		       (USER_RING << PS_RING_SHIFT) |			\
 		       (1 << PS_UM_BIT) |				\

arch/xtensa/include/asm/regs.h

@@ -81,6 +81,7 @@
 /*  PS register fields.  */
 
 #define PS_WOE_BIT		18
+#define PS_WOE_MASK		0x00040000
 #define PS_CALLINC_SHIFT	16
 #define PS_CALLINC_MASK		0x00030000
 #define PS_OWB_SHIFT		8

arch/xtensa/kernel/entry.S

@@ -414,7 +414,7 @@ common_exception:
 	movi	a3, LOCKLEVEL
 
 .Lexception:
-	movi	a0, 1 << PS_WOE_BIT
+	movi	a0, PS_WOE_MASK
 	or	a3, a3, a0
 #else
 	addi	a2, a2, -EXCCAUSE_LEVEL1_INTERRUPT
@@ -422,7 +422,7 @@ common_exception:
 	extui	a3, a3, PS_INTLEVEL_SHIFT, PS_INTLEVEL_WIDTH
 					# a3 = PS.INTLEVEL
 	moveqz	a3, a0, a2		# a3 = LOCKLEVEL iff interrupt
-	movi	a2, 1 << PS_WOE_BIT
+	movi	a2, PS_WOE_MASK
 	or	a3, a3, a2
 	rsr	a2, exccause
 #endif
@@ -922,7 +922,7 @@ ENTRY(unrecoverable_exception)
 	wsr	a1, windowbase
 	rsync
 
-	movi	a1, (1 << PS_WOE_BIT) | LOCKLEVEL
+	movi	a1, PS_WOE_MASK | LOCKLEVEL
 	wsr	a1, ps
 	rsync
 
@@ -1359,7 +1359,7 @@ ENTRY(fast_syscall_spill_registers)
 	rsr	a3, excsave1
 	l32i	a1, a3, EXC_TABLE_KSTK
 
-	movi	a4, (1 << PS_WOE_BIT) | LOCKLEVEL
+	movi	a4, PS_WOE_MASK | LOCKLEVEL
 	wsr	a4, ps
 	rsync
 

arch/xtensa/kernel/head.S

@@ -193,7 +193,7 @@ ENTRY(_startup)
 	movi	a1, start_info
 	l32i	a1, a1, 0
 
-	movi	a2, (1 << PS_WOE_BIT) | LOCKLEVEL
+	movi	a2, PS_WOE_MASK | LOCKLEVEL
 					# WOE=1, INTLEVEL=LOCKLEVEL, UM=0
 	wsr	a2, ps			# (enable reg-windows; progmode stack)
 	rsync