frv: gdb: use __maybe_unused

Replace function instances of __attribute__((unused)) with
__maybe_unused to suppress warnings.

Cc: David Howells <dhowells@redhat.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/frv/kernel/gdb-stub.c

@@ -1195,7 +1195,7 @@ static void gdbstub_check_breakpoint(void)
 /*
  *
  */
-static void __attribute__((unused)) gdbstub_show_regs(void)
+static void __maybe_unused gdbstub_show_regs(void)
 {
 	unsigned long *reg;
 	int loop;
@@ -1223,7 +1223,7 @@ static void __attribute__((unused)) gdbstub_show_regs(void)
 /*
  * dump debugging regs
  */
-static void __attribute__((unused)) gdbstub_dump_debugregs(void)
+static void __maybe_unused gdbstub_dump_debugregs(void)
 {
 	gdbstub_printk("DCR    %08lx  ", __debug_status.dcr);
 	gdbstub_printk("BRR    %08lx\n", __debug_status.brr);
@@ -2079,25 +2079,25 @@ void gdbstub_exit(int status)
  * GDB wants to call malloc() and free() to allocate memory for calling kernel
  * functions directly from its command line
  */
-static void *malloc(size_t size) __attribute__((unused));
+static void *malloc(size_t size) __maybe_unused;
 static void *malloc(size_t size)
 {
 	return kmalloc(size, GFP_ATOMIC);
 }
 
-static void free(void *p) __attribute__((unused));
+static void free(void *p) __maybe_unused;
 static void free(void *p)
 {
 	kfree(p);
 }
 
-static uint32_t ___get_HSR0(void) __attribute__((unused));
+static uint32_t ___get_HSR0(void) __maybe_unused;
 static uint32_t ___get_HSR0(void)
 {
 	return __get_HSR(0);
 }
 
-static uint32_t ___set_HSR0(uint32_t x) __attribute__((unused));
+static uint32_t ___set_HSR0(uint32_t x) __maybe_unused;
 static uint32_t ___set_HSR0(uint32_t x)
 {
 	__set_HSR(0, x);