linux-kernel - [tip:timers/core] hrtimer: Make room in 'struct hrtimer_cpu

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Date:   Mon, 15 Jan 2018 19:45:10 -0800
From:   tip-bot for Anna-Maria Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, john.stultz@...aro.org,
        tglx@...utronix.de, peterz@...radead.org,
        torvalds@...ux-foundation.org, hpa@...or.com, hch@....de,
        mingo@...nel.org, anna-maria@...utronix.de
Subject: [tip:timers/core] hrtimer: Make room in 'struct hrtimer_cpu_base'

Commit-ID:  da21c5a58a7f30db69e04e06dfb6777ccbb1113c
Gitweb:     https://git.kernel.org/tip/da21c5a58a7f30db69e04e06dfb6777ccbb1113c
Author:     Anna-Maria Gleixner <anna-maria@...utronix.de>
AuthorDate: Thu, 21 Dec 2017 11:41:41 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
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 <anna-maria@...utronix.de>
Cc: Christoph Hellwig <hch@....de>
Cc: John Stultz <john.stultz@...aro.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: keescook@...omium.org
Link: http://lkml.kernel.org/r/20171221104205.7269-13-anna-maria@linutronix.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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;
 #endif
 	struct hrtimer_clock_base	clock_base[HRTIMER_MAX_CLOCK_BASES];