linux-kernel - Re: [RFC patch 03/15] get_cycles() : sparc64 HAVE_GET

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Date:	Thu, 16 Oct 2008 22:48:24 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	David Miller <davem@...emloft.net>, Ingo Molnar <mingo@...hat.com>
Subject: Re: [RFC patch 03/15] get_cycles() : sparc64 HAVE_GET_CYCLES
	(update)

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@...ymtl.ca>
CC: David Miller <davem@...emloft.net>
CC: Linus Torvalds <torvalds@...ux-foundation.org>
CC: Andrew Morton <akpm@...ux-foundation.org>
CC: Ingo Molnar <mingo@...hat.com>
CC: Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC: Thomas Gleixner <tglx@...utronix.de>
CC: Steven Rostedt <rostedt@...dmis.org>
CC: linux-arch@...r.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)
 {

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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