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Groups > linux.kernel > #1164467

[PATCH v2 10/17] input/joystick/analog: Switch from rdtscl() to native_read_tsc()

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

Cc: 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

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[PATCH v2 10/17] input/joystick/analog: Switch from rdtscl() to native_read_tsc() Andy Lutomirski <luto@kernel.org> - 2015-06-13 01:50 +0200
  Re: [PATCH v2 10/17] input/joystick/analog: Switch from rdtscl() to  native_read_tsc() Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2015-06-17 01:10 +0200
    Re: [PATCH v2 10/17] input/joystick/analog: Switch from rdtscl() to native_read_tsc() Andy Lutomirski <luto@amacapital.net> - 2015-06-17 01:10 +0200
      Re: [PATCH v2 10/17] input/joystick/analog: Switch from rdtscl() to native_read_tsc() Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2015-06-17 01:20 +0200

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