[tip:perfcounters/core] perf_counter: frequency based adaptive irq_period, 32-bit fix

[tip-bot for Peter Zijlstra]

Commit-ID:  2e569d36729c8105ae066a9b105068305442cc77
Gitweb:     http://git.kernel.org/tip/2e569d36729c8105ae066a9b105068305442cc77
Author:     Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
AuthorDate: Fri, 15 May 2009 15:37:47 +0200
Committer:  Ingo Molnar <mingo@xxxxxxx>
CommitDate: Fri, 15 May 2009 15:40:25 +0200

perf_counter: frequency based adaptive irq_period, 32-bit fix

fix:

  kernel/built-in.o: In function `perf_counter_alloc':
  perf_counter.c:(.text+0x7ddc7): undefined reference to `__udivdi3'

[ Impact: build fix on 32-bit systems ]

Reported-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Corey Ashford <cjashfor@xxxxxxxxxxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
LKML-Reference: <1242394667.6642.1887.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>


---
 kernel/perf_counter.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index 0ad1db4..728a595 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -2942,7 +2942,7 @@ perf_counter_alloc(struct perf_counter_hw_event *hw_event,
 
 	hwc = &counter->hw;
 	if (hw_event->freq && hw_event->irq_freq)
-		hwc->irq_period = TICK_NSEC / hw_event->irq_freq;
+		hwc->irq_period = div64_u64(TICK_NSEC, hw_event->irq_freq);
 	else
 		hwc->irq_period = hw_event->irq_period;
 
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