[POWERPC] Move iSeries_tb_recal into its own late_initcall.

Currently iSeries will recalibrate the cputime_factors in the first
settimeofday() call.

It seems the reason for doing this is to ensure a resaonable time delta after
time_init().  On current kernels (with udev), this call is made 40-60 seconds
into the boot process, by moving it to a late initcall it is called
approximately 5 seconds after time_init() is called.  This is sufficient to
recalibrate the timebase.

Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
CC: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 19 insertions, 11 deletions

diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 43c687a1d76e..66d2db7495aa 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -77,9 +77,8 @@
 /* keep track of when we need to update the rtc */
 time_t last_rtc_update;
 #ifdef CONFIG_PPC_ISERIES
-unsigned long iSeries_recal_titan = 0;
-unsigned long iSeries_recal_tb = 0; 
-static unsigned long first_settimeofday = 1;
+static unsigned long __initdata iSeries_recal_titan;
+static signed long __initdata iSeries_recal_tb;
 #endif
 
 /* The decrementer counts down by 128 every 128ns on a 601. */
@@ -556,10 +555,15 @@ EXPORT_SYMBOL(profile_pc);
  * returned by the service processor for the timebase frequency.  
  */
 
-static void iSeries_tb_recal(void)
+static int __init iSeries_tb_recal(void)
 {
         struct div_result divres;
         unsigned long titan, tb;
+
+        /* Make sure we only run on iSeries */
+        if (!firmware_has_feature(FW_FEATURE_ISERIES))
+                return -ENODEV;
+
         tb = get_tb();
         titan = HvCallXm_loadTod();
         if ( iSeries_recal_titan ) {
@@ -600,8 +604,18 @@ static void iSeries_tb_recal(void)
         }
         iSeries_recal_titan = titan;
         iSeries_recal_tb = tb;
+
+        return 0;
 }
-#endif
+late_initcall(iSeries_tb_recal);
+
+/* Called from platform early init */
+void __init iSeries_time_init_early(void)
+{
+        iSeries_recal_tb = get_tb();
+        iSeries_recal_titan = HvCallXm_loadTod();
+}
+#endif /* CONFIG_PPC_ISERIES */
 
 /*
  * For iSeries shared processors, we have to let the hypervisor
@@ -765,12 +779,6 @@ int do_settimeofday(struct timespec *tv)
          * to the RTC again, or write to the RTC but then they don't call
          * settimeofday to perform this operation.
          */
-#ifdef CONFIG_PPC_ISERIES
-        if (firmware_has_feature(FW_FEATURE_ISERIES) && first_settimeofday) {
-                iSeries_tb_recal();
-                first_settimeofday = 0;
-        }
-#endif
 
         /* Make userspace gettimeofday spin until we're done. */
         ++vdso_data->tb_update_count;