[PATCH/RFC] Make certain timekeeping variables __read_mostly

[tony@bakeyournoodle.com (Tony Breeds)]

On Wed, Jun 20, 2007 at 12:02:11PM +1000, Tony Breeds wrote:
 
> Also this patch makes tb_to_ns_scale and tb_to_ns_shift static for good
> measure.

While we're ate it these 3 variables can be marked __read_mostly.

Depends on previous patch.

From: Tony Breeds <tony@bakeyournoodle.com>

These really are read mostly as they're only written to in time_init()

Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>

---
There looks to be other variables that can be made read_mostly, I think
that's a job for another day though (perhaps while doing the static cleanup).

 arch/powerpc/kernel/time.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
Index: working/arch/powerpc/kernel/time.c
===================================================================
--- working.orig/arch/powerpc/kernel/time.c	2007-06-20 12:08:27.000000000 +1000
+++ working/arch/powerpc/kernel/time.c	2007-06-20 12:08:32.000000000 +1000
@@ -113,9 +113,9 @@ u64 ticklen_to_xs;	/* 0.64 fraction */
 DEFINE_SPINLOCK(rtc_lock);
 EXPORT_SYMBOL_GPL(rtc_lock);
 
-static u64 tb_to_ns_scale;
-static unsigned tb_to_ns_shift;
-static unsigned long boot_tb;
+static u64 tb_to_ns_scale __read_mostly;
+static unsigned tb_to_ns_shift __read_mostly;
+static unsigned long boot_tb __read_mostly;
 
 struct gettimeofday_struct do_gtod;
 

Yours Tony

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