linux-kernel - [PATCH 1/7] time: Define dummy functions for the generic sched clock

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Date:	Thu, 29 Oct 2015 23:52:37 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	tglx@...utronix.de
Cc:	john.stultz@...aro.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/7] time: Define dummy functions for the generic sched clock

When we try to compile a clocksource driver with the COMPILE_TEST option, we
can't select the GENERIC_SCHED_CLOCK because the sched_clock() symbol will be
duplicated with the one defined for the x86.

In order to fix that, we don't select the GENERIC_SCHED_CLOCK in the driver
Kconfig's file but we define some empty functions for the different symbols
in order to prevent the unresolved ones.

This patch fixes the COMPILE_TEST option for the compile test coverage for the
clocksource drivers. Without this patch, we can't add the COMPILE_TEST option
for the clocksource drivers using the GENERIC_SCHED_CLOCK.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 include/linux/sched_clock.h | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/include/linux/sched_clock.h b/include/linux/sched_clock.h
index efa931c..b2ec7bb 100644
--- a/include/linux/sched_clock.h
+++ b/include/linux/sched_clock.h
@@ -10,11 +10,17 @@

 #ifdef CONFIG_GENERIC_SCHED_CLOCK
 extern void sched_clock_postinit(void);
+
+extern void sched_clock_register(u64 (*read)(void), int bits,
+                                 unsigned long rate);
 #else
 static inline void sched_clock_postinit(void) { }
-#endif

-extern void sched_clock_register(u64 (*read)(void), int bits,
-				 unsigned long rate);
+static inline void sched_clock_register(u64 (*read)(void), int bits,
+					 unsigned long rate)
+{
+	;
+}
+#endif

 #endif
-- 
1.9.1

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