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Subject[tip:timers/core] hrtimer: Make room in 'struct hrtimer_cpu_base'
Commit-ID:  da21c5a58a7f30db69e04e06dfb6777ccbb1113c
Author: Anna-Maria Gleixner <>
AuthorDate: Thu, 21 Dec 2017 11:41:41 +0100
Committer: Ingo Molnar <>
CommitDate: Tue, 16 Jan 2018 02:35:46 +0100

hrtimer: Make room in 'struct hrtimer_cpu_base'

The upcoming softirq based hrtimers support requires an additional field in
the hrtimer_cpu_base struct, which would grow the struct size beyond a
cache line.

The hrtimer_cpu_base::nr_retries and ::nr_hangs members are solely
used for diagnostic output and have no requirement to be 'unsigned int'.

Make them 'unsigned short' to create room for the new struct member.

No functional change.

Signed-off-by: Anna-Maria Gleixner <>
Cc: Christoph Hellwig <>
Cc: John Stultz <>
Cc: Linus Torvalds <>
Cc: Peter Zijlstra <>
Cc: Thomas Gleixner <>
Signed-off-by: Ingo Molnar <>
include/linux/hrtimer.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 1bae7b9..56e56bc 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -189,8 +189,8 @@ struct hrtimer_cpu_base {
ktime_t expires_next;
struct hrtimer *next_timer;
unsigned int nr_events;
- unsigned int nr_retries;
- unsigned int nr_hangs;
+ unsigned short nr_retries;
+ unsigned short nr_hangs;
unsigned int max_hang_time;
struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES];
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