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USB: serial: inline sysrq dummy function

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Inline the dummy sysrq character handling when either console support or
magic-sysrq support isn't enabled to allow the compiler to eliminate
unused code.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2020-07-08 14:49:56 +02:00
parent 8c6a223186
commit 4fbfbdb572
2 changed files with 11 additions and 7 deletions
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9
drivers/usb/serial/generic.c
View File

@ -571,7 +571,7 @@ int usb_serial_generic_get_icount(struct tty_struct *tty,
} }
EXPORT_SYMBOL_GPL(usb_serial_generic_get_icount); EXPORT_SYMBOL_GPL(usb_serial_generic_get_icount);
#ifdef CONFIG_MAGIC_SYSRQ #if defined(CONFIG_USB_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch) int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch)
{ {
if (port->sysrq) { if (port->sysrq) {
@ -584,13 +584,8 @@ int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch)
} }
return 0; return 0;
} }
#else
int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch)
{
return 0;
}
#endif
EXPORT_SYMBOL_GPL(usb_serial_handle_sysrq_char); EXPORT_SYMBOL_GPL(usb_serial_handle_sysrq_char);
#endif
int usb_serial_handle_break(struct usb_serial_port *port) int usb_serial_handle_break(struct usb_serial_port *port)
{ {

9
include/linux/usb/serial.h
View File

@ -365,8 +365,17 @@ extern int usb_serial_generic_submit_read_urbs(struct usb_serial_port *port,
extern void usb_serial_generic_process_read_urb(struct urb *urb); extern void usb_serial_generic_process_read_urb(struct urb *urb);
extern int usb_serial_generic_prepare_write_buffer(struct usb_serial_port *port, extern int usb_serial_generic_prepare_write_buffer(struct usb_serial_port *port,
void *dest, size_t size); void *dest, size_t size);
#if defined(CONFIG_USB_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
extern int usb_serial_handle_sysrq_char(struct usb_serial_port *port, extern int usb_serial_handle_sysrq_char(struct usb_serial_port *port,
unsigned int ch); unsigned int ch);
#else
static inline int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch)
{
return 0;
}
#endif
extern int usb_serial_handle_break(struct usb_serial_port *port); extern int usb_serial_handle_break(struct usb_serial_port *port);
extern void usb_serial_handle_dcd_change(struct usb_serial_port *usb_port, extern void usb_serial_handle_dcd_change(struct usb_serial_port *usb_port,
struct tty_struct *tty, struct tty_struct *tty,