linux-kernel - [PATCH 12/12] clocksource: Add some debug info about clocksources being registered

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Date:	Thu, 22 Jan 2015 16:09:27 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	John Stultz <john.stultz@...aro.org>,
	Dave Jones <davej@...emonkey.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Richard Cochran <richardcochran@...il.com>,
	Prarit Bhargava <prarit@...hat.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 12/12] clocksource: Add some debug info about clocksources being registered

Print the mask, max_cycles, and max_idle_ns values for clocksources
being registered.

Cc: Dave Jones <davej@...emonkey.org.uk>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Richard Cochran <richardcochran@...il.com>
Cc: Prarit Bhargava <prarit@...hat.com>
Cc: Stephen Boyd <sboyd@...eaurora.org>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 kernel/time/clocksource.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index b56f4b9..ec7b552 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -773,6 +773,10 @@ void __clocksource_updatefreq_scale(struct clocksource *cs, u32 scale, u32 freq)
 	cs->max_idle_ns = clocks_calc_max_nsecs(cs->mult, cs->shift,
 						 cs->maxadj, cs->mask,
 						 &cs->max_cycles);
+
+	pr_info("clocksource %s: mask: 0x%llx max_cycles: 0x%llx, max_idle_ns: %lld ns\n",
+			cs->name, cs->mask, cs->max_cycles, cs->max_idle_ns);
+
 }
 EXPORT_SYMBOL_GPL(__clocksource_updatefreq_scale);
 
-- 
1.9.1

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