[RFC patch 04/15] get_cycles() : powerpc64 HAVE_GET_CYCLES

Mathieu Desnoyers
2008-10-16T23:27:33Z

[-- Attachment #1: get-cycles-powerpc-have-get-cycles.patch --]
[-- Type: text/plain, Size: 1994 bytes --]

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

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: benh@kernel.crashing.org
CC: paulus@samba.org
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/powerpc/Kconfig | 1 +
arch/powerpc/include/asm/timex.h | 13 +++++++++++++
2 files changed, 14 insertions(+)

Index: linux-2.6-lttng/arch/powerpc/Kconfig
===================================================================
--- linux-2.6-lttng.orig/arch/powerpc/Kconfig 2008-10-16 12:25:48.000000000 -0400
+++ linux-2.6-lttng/arch/powerpc/Kconfig 2008-10-16 12:33:31.000000000 -0400
@@ -122,6 +122,7 @@ config PPC
select HAVE_DMA_ATTRS if PPC64
select USE_GENERIC_SMP_HELPERS if SMP
select HAVE_OPROFILE
+ select HAVE_GET_CYCLES if PPC64

config EARLY_PRINTK
bool
Index: linux-2.6-lttng/arch/powerpc/include/asm/timex.h
===================================================================
--- linux-2.6-lttng.orig/arch/powerpc/include/asm/timex.h 2008-10-16 12:25:48.000000000 -0400
+++ linux-2.6-lttng/arch/powerpc/include/asm/timex.h 2008-10-16 12:33:58.000000000 -0400
@@ -46,5 +46,18 @@ static inline cycles_t get_cycles(void)
#endif
}

+static inline cycles_t get_cycles_rate(void)
+{
+ return CLOCK_TICK_RATE;
+}
+
+/*
+ * To check : assuming mtfb requires isync to synchronize instruction execution.
+ */
+static inline void get_cycles_barrier(void)
+{
+ isync();
+}
+
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_TIMEX_H */

--
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal