linux-kernel - [PATCH v3 12/36] hrtimer: Make room in struct hrtimer_cpu

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Date:   Wed, 29 Nov 2017 16:30:37 +0100
From:   Anna-Maria Gleixner <anna-maria@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, keescook@...omium.org,
        Christoph Hellwig <hch@....de>,
        John Stultz <john.stultz@...aro.org>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>
Subject: [PATCH v3 12/36] 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 struct members nr_retries and nr_hangs of hrtimer_cpu_base 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 <anna-maria@...utronix.de>
---
 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 1bae7b9f071d..56e56bcb6f0f 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;
 #endif
 	struct hrtimer_clock_base	clock_base[HRTIMER_MAX_CLOCK_BASES];
-- 
2.11.0