On 9/6/21 10:59 PM, Dmitry Torokhov wrote:
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.
Will do.
}
/*
@@ -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.
Sure. I'll just use NSEC_PER_MSEC directly.
Thanks,
Guenter
