[PATCH] cpu_has_tsc

[PATCH] cpu_has_tsc

[Brian Gerst]

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This patch converts drivers/char/random.c and 
drivers/input/joystick/analog.c to use the cpu_has_tsc macro.

--

						Brian Gerst

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diff -urN linux-bk/drivers/char/random.c linux/drivers/char/random.c
--- linux-bk/drivers/char/random.c	Wed May 15 10:27:26 2002
+++ linux/drivers/char/random.c	Mon May 20 22:03:58 2002
@@ -735,18 +735,14 @@
 	__s32		delta, delta2, delta3;
 	int		entropy = 0;
 
-#if defined (__i386__)
-	if ( test_bit(X86_FEATURE_TSC, boot_cpu_data.x86_capability) ) {
+#if defined (__i386__) || defined (__x86_64__)
+	if (cpu_has_tsc)
 		__u32 high;
 		rdtsc(time, high);
 		num ^= high;
 	} else {
 		time = jiffies;
 	}
-#elif defined (__x86_64__)
-	__u32 high;
-	rdtsc(time, high);
-	num ^= high;
 #else
 	time = jiffies;
 #endif
diff -urN linux-bk/drivers/input/joystick/analog.c linux/drivers/input/joystick/analog.c
--- linux-bk/drivers/input/joystick/analog.c	Thu Mar  7 21:18:24 2002
+++ linux/drivers/input/joystick/analog.c	Mon May 20 22:05:48 2002
@@ -137,10 +137,9 @@
  */
 
 #ifdef __i386__
-#define TSC_PRESENT	(test_bit(X86_FEATURE_TSC, &boot_cpu_data.x86_capability))
-#define GET_TIME(x)	do { if (TSC_PRESENT) rdtscl(x); else x = get_time_pit(); } while (0)
-#define DELTA(x,y)	(TSC_PRESENT?((y)-(x)):((x)-(y)+((x)<(y)?1193180L/HZ:0)))
-#define TIME_NAME	(TSC_PRESENT?"TSC":"PIT")
+#define GET_TIME(x)	do { if (cpu_has_tsc) rdtscl(x); else x = get_time_pit(); } while (0)
+#define DELTA(x,y)	(cpu_has_tsc?((y)-(x)):((x)-(y)+((x)<(y)?1193180L/HZ:0)))
+#define TIME_NAME	(cpu_has_tsc?"TSC":"PIT")
 static unsigned int get_time_pit(void)
 {
         extern spinlock_t i8253_lock;

Re: [PATCH] cpu_has_tsc

[Martin J. Bligh]

Excellent - thanks for doing this. This is obviously broken
at the moment, and I have to disable TSCs ;-)

--On Monday, May 20, 2002 10:10 PM -0400 Brian Gerst <bgerst@didntduck.org> wrote:

> This patch converts drivers/char/random.c and drivers/input/joystick/analog.c to use the cpu_has_tsc macro.
> 
> --
> 
> 						Brian Gerst