Hi Guenter,
On Mon, Sep 06, 2021 at 10:06:06PM -0700, Guenter Roeck wrote:
> m68k, mips, s390, and sparc allmodconfig images fail to build with the
> following error.
>
> drivers/input/joystick/analog.c:160:2: error:
> #warning Precise timer not defined for this architecture.
>
> Remove architecture specific time handling code and always use ktime
> functions to determine time deltas. Also remove the now useless use_ktime
> kernel parameter.
>
> Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> ---
> drivers/input/joystick/analog.c | 74 ++-------------------------------
> 1 file changed, 3 insertions(+), 71 deletions(-)
>
> diff --git a/drivers/input/joystick/analog.c b/drivers/input/joystick/analog.c
> index f798922a4598..4702982182fa 100644
> --- a/drivers/input/joystick/analog.c
> +++ b/drivers/input/joystick/analog.c
> @@ -28,10 +28,6 @@ MODULE_AUTHOR("Vojtech Pavlik <vojtech@xxxxxx>");
> MODULE_DESCRIPTION(DRIVER_DESC);
> MODULE_LICENSE("GPL");
>
> -static bool use_ktime = true;
> -module_param(use_ktime, bool, 0400);
> -MODULE_PARM_DESC(use_ktime, "Use ktime for measuring I/O speed");
> -
> /*
> * Option parsing.
> */
> @@ -119,64 +115,14 @@ struct analog_port {
> int axtime;
> };
>
> -/*
> - * Time macros.
> - */
> -
> -#ifdef __i386__
> -
> -#include <linux/i8253.h>
> -
> -#define GET_TIME(x) do { if (boot_cpu_has(X86_FEATURE_TSC)) x = (unsigned int)rdtsc(); else x = get_time_pit(); } while (0)
> -#define DELTA(x,y) (boot_cpu_has(X86_FEATURE_TSC) ? ((y) - (x)) : ((x) - (y) + ((x) < (y) ? PIT_TICK_RATE / HZ : 0)))
> -#define TIME_NAME (boot_cpu_has(X86_FEATURE_TSC)?"TSC":"PIT")
> -static unsigned int get_time_pit(void)
> -{
> - unsigned long flags;
> - unsigned int count;
> -
> - raw_spin_lock_irqsave(&i8253_lock, flags);
> - outb_p(0x00, 0x43);
> - count = inb_p(0x40);
> - count |= inb_p(0x40) << 8;
> - raw_spin_unlock_irqrestore(&i8253_lock, flags);
> -
> - return count;
> -}
> -#elif defined(__x86_64__)
> -#define GET_TIME(x) do { x = (unsigned int)rdtsc(); } while (0)
> -#define DELTA(x,y) ((y)-(x))
> -#define TIME_NAME "TSC"
> -#elif defined(__alpha__) || defined(CONFIG_ARM) || defined(CONFIG_ARM64) || defined(CONFIG_PPC) || defined(CONFIG_RISCV)
> -#define GET_TIME(x) do { x = get_cycles(); } while (0)
> -#define DELTA(x,y) ((y)-(x))
> -#define TIME_NAME "get_cycles"
> -#else
> -#define FAKE_TIME
> -static unsigned long analog_faketime = 0;
> -#define GET_TIME(x) do { x = analog_faketime++; } while(0)
> -#define DELTA(x,y) ((y)-(x))
> -#define TIME_NAME "Unreliable"
> -#warning Precise timer not defined for this architecture.
> -#endif
> -
> static inline u64 get_time(void)
> {
> - if (use_ktime) {
> - return ktime_get_ns();
> - } else {
> - unsigned int x;
> - GET_TIME(x);
> - return x;
> - }
> + return ktime_get_ns();
> }
>
> static inline unsigned int delta(u64 x, u64 y)
> {
> - if (use_ktime)
> - return y - x;
> - else
> - return DELTA((unsigned int)x, (unsigned int)y);
> + return y - x;
I wonder if we should get rid of these wrappers and use ktime_t and
ktime_get(), ktime_sub(), etc directly.
> }
>
> /*
> @@ -378,21 +324,7 @@ static void analog_calibrate_timer(struct analog_port *port)
> u64 t1, t2, t3;
> unsigned long flags;
>
> - if (use_ktime) {
> - port->speed = 1000000;
> - } else {
> - local_irq_save(flags);
> - t1 = get_time();
> -#ifdef FAKE_TIME
> - analog_faketime += 830;
> -#endif
> - mdelay(1);
> - t2 = get_time();
> - t3 = get_time();
> - local_irq_restore(flags);
> -
> - port->speed = delta(t1, t2) - delta(t2, t3);
> - }
> + port->speed = 1000000;
It seems we could get rid of port->speed.
Thanks.
--
Dmitry
