[PATCH 3/8] serial: drop serial_rx_fn's regs parameter

[Jan Beulich <jbeulich@xxxxxxxx>]

In the one place where it's needed, get_irq_regs() can be used instead.
This is in preparation of dropping the register parameters from IRQ
handler functions.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/drivers/char/console.c
+++ b/xen/drivers/char/console.c
@@ -527,12 +527,12 @@ static void switch_serial_input(void)
     printk("\n");
 }
 
-static void __serial_rx(char c, struct cpu_user_regs *regs)
+static void __serial_rx(char c)
 {
     switch ( console_rx )
     {
     case 0:
-        return handle_keypress(c, regs);
+        return handle_keypress(c, get_irq_regs());
 
     case 1:
         /*
@@ -579,7 +579,7 @@ static void __serial_rx(char c, struct c
 #endif
 }
 
-static void cf_check serial_rx(char c, struct cpu_user_regs *regs)
+static void cf_check serial_rx(char c)
 {
     static int switch_code_count = 0;
 
@@ -595,10 +595,10 @@ static void cf_check serial_rx(char c, s
     }
 
     for ( ; switch_code_count != 0; switch_code_count-- )
-        __serial_rx(switch_code, regs);
+        __serial_rx(switch_code);
 
     /* Finally process the just-received character. */
-    __serial_rx(c, regs);
+    __serial_rx(c);
 }
 
 static void cf_check notify_dom0_con_ring(void *unused)
--- a/xen/drivers/char/serial.c
+++ b/xen/drivers/char/serial.c
@@ -68,7 +68,7 @@ void serial_rx_interrupt(struct serial_p
     spin_unlock_irqrestore(&port->rx_lock, flags);
 
     if ( fn != NULL )
-        (*fn)(c & 0x7f, regs);
+        fn(c & 0x7f);
 }
 
 void serial_tx_interrupt(struct serial_port *port, struct cpu_user_regs *regs)
--- a/xen/drivers/char/xen_pv_console.c
+++ b/xen/drivers/char/xen_pv_console.c
@@ -118,7 +118,7 @@ size_t pv_console_rx(struct cpu_user_reg
     {
         c = cons_ring->in[MASK_XENCONS_IDX(cons++, cons_ring->in)];
         if ( cons_rx_handler )
-            cons_rx_handler(c, regs);
+            cons_rx_handler(c);
         recv++;
     }
 
--- a/xen/include/xen/serial.h
+++ b/xen/include/xen/serial.h
@@ -15,7 +15,7 @@
 struct cpu_user_regs;
 
 /* Register a character-receive hook on the specified COM port. */
-typedef void (*serial_rx_fn)(char c, struct cpu_user_regs *regs);
+typedef void (*serial_rx_fn)(char c);
 void serial_set_rx_handler(int handle, serial_rx_fn fn);
 
 /* Number of characters we buffer for a polling receiver. */