linux-kernel - Re: [PATCH v2 10/17] input/joystick/analog: Switch from rdtscl() to native_read

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Date:	Tue, 16 Jun 2015 16:09:06 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
	Borislav Petkov <bp@...e.de>,
	Peter Zijlstra <peterz@...radead.org>,
	John Stultz <john.stultz@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Len Brown <lenb@...nel.org>, Huang Rui <ray.huang@....com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>
Subject: Re: [PATCH v2 10/17] input/joystick/analog: Switch from rdtscl() to native_read_tsc()

Is it okay for -tip to take this and the other one you just acked?

Thanks,
Andy

On Tue, Jun 16, 2015 at 4:03 PM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
> On Fri, Jun 12, 2015 at 04:44:50PM -0700, Andy Lutomirski wrote:
>> 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@...il.com>
>> Cc: linux-input@...r.kernel.org
>> Signed-off-by: Andy Lutomirski <luto@...nel.org>
>
> Acked-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
>
>> ---
>>  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
>>
>
> --
> Dmitry



-- 
Andy Lutomirski
AMA Capital Management, LLC
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