xtensa: drop unused fast_io_protect function

fast_io_protect is not used anywhere, drop its definition.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

diff --git a/arch/xtensa/kernel/coprocessor.S b/arch/xtensa/kernel/coprocessor.S
index 6911e38..3a98503 100644 (file)
--- a/arch/xtensa/kernel/coprocessor.S
+++ b/arch/xtensa/kernel/coprocessor.S
@@ -26,30 +26,6 @@
 #include <asm/signal.h>
 #include <asm/tlbflush.h>
 
-/*
- * Entry condition:
- *
- *   a0:       trashed, original value saved on stack (PT_AREG0)
- *   a1:       a1
- *   a2:       new stack pointer, original in DEPC
- *   a3:       a3
- *   depc:     a2, original value saved on stack (PT_DEPC)
- *   excsave_1:        dispatch table
- *
- *   PT_DEPC >= VALID_DOUBLE_EXCEPTION_ADDRESS: double exception, DEPC
- *          <  VALID_DOUBLE_EXCEPTION_ADDRESS: regular exception
- */
-
-/* IO protection is currently unsupported. */
-
-ENTRY(fast_io_protect)
-
-       wsr     a0, excsave1
-       movi    a0, unrecoverable_exception
-       callx0  a0
-
-ENDPROC(fast_io_protect)
-
 #if XTENSA_HAVE_COPROCESSORS
 
 /*