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Subject[PATCH] linux-2.5.55_timer-tsc-cleanups_A0
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Linus, All,

This patch cleans up the timer_tsc code. It removes the unused use_tsc
variable and makes fast_gettimeoffset_quotient static (replacing it w/
cpu_khz in smpboot.c).

Please consider for acceptance.

thanks
-john


diff -Nru a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c
--- a/arch/i386/kernel/smpboot.c Thu Jan 9 17:03:07 2003
+++ b/arch/i386/kernel/smpboot.c Thu Jan 9 17:03:07 2003
@@ -182,8 +182,6 @@

#define NR_LOOPS 5

-extern unsigned long fast_gettimeoffset_quotient;
-
/*
* accurate 64-bit/32-bit division, expanded to 32-bit divisions and 64-bit
* multiplication. Not terribly optimized but we need it at boot time only
@@ -223,7 +221,8 @@

printk("checking TSC synchronization across %u CPUs: ", num_booting_cpus());

- one_usec = ((1<<30)/fast_gettimeoffset_quotient)*(1<<2);
+ /* convert from kcyc/sec to cyc/usec */
+ one_usec = cpu_khz / 1000;

atomic_set(&tsc_start_flag, 1);
wmb();
diff -Nru a/arch/i386/kernel/timers/timer_tsc.c b/arch/i386/kernel/timers/timer_tsc.c
--- a/arch/i386/kernel/timers/timer_tsc.c Thu Jan 9 17:03:07 2003
+++ b/arch/i386/kernel/timers/timer_tsc.c Thu Jan 9 17:03:07 2003
@@ -19,7 +19,6 @@
extern int x86_udelay_tsc;
extern spinlock_t i8253_lock;

-static int use_tsc;
/* Number of usecs that the last interrupt was delayed */
static int delay_at_last_interrupt;

@@ -30,7 +29,7 @@
* Equal to 2^32 * (1 / (clocks per usec) ).
* Initialized in time_init.
*/
-unsigned long fast_gettimeoffset_quotient;
+static unsigned long fast_gettimeoffset_quotient;

static unsigned long get_offset_tsc(void)
{
@@ -267,7 +266,6 @@
unsigned long tsc_quotient = calibrate_tsc();
if (tsc_quotient) {
fast_gettimeoffset_quotient = tsc_quotient;
- use_tsc = 1;
/*
* We could be more selective here I suspect
* and just enable this for the next intel chips ?


-
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