[RFC patch 03/18] get_cycles() : sparc64 HAVE_GET_CYCLES

Mathieu Desnoyers
2008-11-07T05:49:36Z

[-- Attachment #1: get-cycles-sparc64-have-get-cycles.patch --]
[-- Type: text/plain, Size: 2763 bytes --]

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>
Acked-by: David S. 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.trees.git/arch/sparc64/Kconfig
===================================================================
--- linux.trees.git.orig/arch/sparc64/Kconfig 2008-10-30 20:22:50.000000000 -0400
+++ linux.trees.git/arch/sparc64/Kconfig 2008-11-07 00:09:35.000000000 -0500
@@ -13,6 +13,7 @@ config SPARC64
default y
select HAVE_FUNCTION_TRACER
select HAVE_IDE
+ select HAVE_GET_CYCLES
select HAVE_LMB
select HAVE_ARCH_KGDB
select USE_GENERIC_SMP_HELPERS if SMP
Index: linux.trees.git/arch/sparc/include/asm/timex_64.h
===================================================================
--- linux.trees.git.orig/arch/sparc/include/asm/timex_64.h 2008-09-30 11:38:51.000000000 -0400
+++ linux.trees.git/arch/sparc/include/asm/timex_64.h 2008-11-07 00:09:35.000000000 -0500
@@ -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.trees.git/arch/sparc64/kernel/time.c
===================================================================
--- linux.trees.git.orig/arch/sparc64/kernel/time.c 2008-11-07 00:06:06.000000000 -0500
+++ linux.trees.git/arch/sparc64/kernel/time.c 2008-11-07 00:09:35.000000000 -0500
@@ -793,7 +793,8 @@ 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