Re: [RFC patch 03/15] get_cycles() : sparc64 HAVE_GET_CYCLES (update)

Mathieu Desnoyers
2008-10-17T02:48:26Z

This patch selects HAVE_GET_CYCLES and makes sure get_cycles_barrier() and
get_cycles_rate() are implemented.

Changelog :
- Use tb_ticks_per_usec * 1000000 in get_cycles_rate().

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: David Miller <davem@davemloft.net>
CC: Linus Torvalds <torvalds@linux-foundation.org>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Ingo Molnar <mingo@redhat.com>
CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Steven Rostedt <rostedt@goodmis.org>
CC: linux-arch@vger.kernel.org
---
arch/sparc/include/asm/timex_64.h | 19 ++++++++++++++++++-
arch/sparc64/Kconfig | 1 +
arch/sparc64/kernel/time.c | 3 ++-
3 files changed, 21 insertions(+), 2 deletions(-)

Index: linux-2.6-lttng/arch/sparc64/Kconfig
===================================================================
--- linux-2.6-lttng.orig/arch/sparc64/Kconfig 2008-10-16 22:29:43.000000000 -0400
+++ linux-2.6-lttng/arch/sparc64/Kconfig 2008-10-16 22:29:53.000000000 -0400
@@ -14,6 +14,7 @@ config SPARC64
select HAVE_DYNAMIC_FTRACE
select HAVE_FTRACE
select HAVE_IDE
+ select HAVE_GET_CYCLES
select HAVE_LMB
select HAVE_ARCH_KGDB
select USE_GENERIC_SMP_HELPERS if SMP
Index: linux-2.6-lttng/arch/sparc/include/asm/timex_64.h
===================================================================
--- linux-2.6-lttng.orig/arch/sparc/include/asm/timex_64.h 2008-10-16 22:29:43.000000000 -0400
+++ linux-2.6-lttng/arch/sparc/include/asm/timex_64.h 2008-10-16 22:33:48.000000000 -0400
@@ -12,7 +12,24 @@

/* Getting on the cycle counter on sparc64. */
typedef unsigned long cycles_t;
-#define get_cycles() tick_ops->get_tick()
+
+static inline cycles_t get_cycles(void)
+{
+ return tick_ops->get_tick();
+}
+
+/* get_cycles instruction is synchronized on sparc64 */
+static inline void get_cycles_barrier(void)
+{
+ return;
+}
+
+extern unsigned long tb_ticks_per_usec;
+
+static inline cycles_t get_cycles_rate(void)
+{
+ return tb_ticks_per_usec * 1000000UL;
+}

#define ARCH_HAS_READ_CURRENT_TIMER

Index: linux-2.6-lttng/arch/sparc64/kernel/time.c
===================================================================
--- linux-2.6-lttng.orig/arch/sparc64/kernel/time.c 2008-10-16 22:30:36.000000000 -0400
+++ linux-2.6-lttng/arch/sparc64/kernel/time.c 2008-10-16 22:30:58.000000000 -0400
@@ -1008,7 +1008,8 @@ static void __init setup_clockevent_mult
sparc64_clockevent.mult = mult;
}

-static unsigned long tb_ticks_per_usec __read_mostly;
+unsigned long tb_ticks_per_usec __read_mostly;
+EXPORT_SYMBOL_GPL(tb_ticks_per_usec);

void __delay(unsigned long loops)
{