[PATCH] Time: i386 Conversion - part 2: Rework TSC Support

As part of the i386 conversion to the generic timekeeping infrastructure, this
introduces a new tsc.c file.  The code in this file replaces the TSC
initialization, management and access code currently in timer_tsc.c (which
will be removed) that we want to preserve.

The code also introduces the following functionality:

o tsc_khz: like cpu_khz but stores the TSC frequency on systems that do not
  change TSC frequency w/ CPU frequency

o check/mark_tsc_unstable: accessor/modifier flag for TSC timekeeping
  usability

o minor cleanups to calibration math.

This patch also includes a one line __cpuinitdata fix from Zwane Mwaikambo.

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 6 insertions, 4 deletions

diff --git a/arch/i386/kernel/numaq.c b/arch/i386/kernel/numaq.c
index 5f5b075f860a..0caf14652bad 100644
--- a/arch/i386/kernel/numaq.c
+++ b/arch/i386/kernel/numaq.c
@@ -79,10 +79,12 @@ int __init get_memcfg_numaq(void)
         return 1;
 }
 
-static int __init numaq_dsc_disable(void)
+static int __init numaq_tsc_disable(void)
 {
-        printk(KERN_DEBUG "NUMAQ: disabling TSC\n");
-        tsc_disable = 1;
+        if (num_online_nodes() > 1) {
+                printk(KERN_DEBUG "NUMAQ: disabling TSC\n");
+                tsc_disable = 1;
+        }
         return 0;
 }
-core_initcall(numaq_dsc_disable);
+arch_initcall(numaq_tsc_disable);