[SERIAL]: Avoid 'statement with no effect' warnings.

When SUPPORT_SYSRQ is false, gcc can emit warnings for
the uart_handle_sysrq_char() that results.  Using an
empty inline returning zero kills the warning.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index cf0f64ea2bc0d36eb742c41c7db0e966525a0685..9b12fe731612dfd2ccb1665278dd5416e2e509f3 100644 (file)
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -385,11 +385,11 @@ int uart_resume_port(struct uart_driver *reg, struct uart_port *port);
 /*
  * The following are helper functions for the low level drivers.
  */
-#ifdef SUPPORT_SYSRQ
 static inline int
 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch,
                       struct pt_regs *regs)
 {
+#ifdef SUPPORT_SYSRQ
        if (port->sysrq) {
                if (ch && time_before(jiffies, port->sysrq)) {
                        handle_sysrq(ch, regs, NULL);
@@ -398,11 +398,9 @@ uart_handle_sysrq_char(struct uart_port *port, unsigned int ch,
                }
                port->sysrq = 0;
        }
+#endif
        return 0;
 }
-#else
-#define uart_handle_sysrq_char(port,ch,regs)   (0)
-#endif
 
 /*
  * We do the SysRQ and SAK checking like this...