[PATCH v3 10/18] input/joystick/analog: Switch from rdtscl() to native_read_tsc()

Andy Lutomirski
2015-06-17T00:39:29Z

This timing code is hideous, and this doesn't help. It gets rid of
one of the last users of rdtscl, though.

Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org
Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
drivers/input/joystick/analog.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/input/joystick/analog.c b/drivers/input/joystick/analog.c
index 4284080e481d..f871b4f00056 100644
--- a/drivers/input/joystick/analog.c
+++ b/drivers/input/joystick/analog.c
@@ -143,7 +143,7 @@ struct analog_port {

#include <linux/i8253.h>

-#define GET_TIME(x) do { if (cpu_has_tsc) rdtscl(x); else x = get_time_pit(); } while (0)
+#define GET_TIME(x) do { if (cpu_has_tsc) x = (unsigned int)native_read_tsc(); else x = get_time_pit(); } while (0)
#define DELTA(x,y) (cpu_has_tsc ? ((y) - (x)) : ((x) - (y) + ((x) < (y) ? PIT_TICK_RATE / HZ : 0)))
#define TIME_NAME (cpu_has_tsc?"TSC":"PIT")
static unsigned int get_time_pit(void)
@@ -160,7 +160,7 @@ static unsigned int get_time_pit(void)
return count;
}
#elif defined(__x86_64__)
-#define GET_TIME(x) rdtscl(x)
+#define GET_TIME(x) do { x = (unsigned int)native_read_tsc(); } while (0)
#define DELTA(x,y) ((y)-(x))
#define TIME_NAME "TSC"
#elif defined(__alpha__) || defined(CONFIG_MN10300) || defined(CONFIG_ARM) || defined(CONFIG_ARM64) || defined(CONFIG_TILE)
--
2.4.2