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authorThomas Gleixner <tglx@linutronix.de>2015-04-15 00:08:44 +0300
committerThomas Gleixner <tglx@linutronix.de>2015-04-22 18:06:49 +0300
commitb8e38413ac2c33c497e72895fcd5da709fd1b908 (patch)
treec2aab305af3fc45fe82b9639ce8af1fa8a72f9d1 /include/linux/hrtimer.h
parent6d9a1411393d51f17bee3fe163430b21b2cb2de9 (diff)
downloadlinux-b8e38413ac2c33c497e72895fcd5da709fd1b908.tar.xz
hrtimer: Align the hrtimer clock bases as well
We don't use cacheline_align here because that might waste lot of space on 32bit machine with 64 bytes cachelines and on 64bit machines with 128 bytes cachelines. The size of struct hrtimer_clock_base is 64byte on 64bit and 32byte on 32bit machines. So we utilize the cache lines proper. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com> Cc: Viresh Kumar <viresh.kumar@linaro.org> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/r/20150414203501.498165771@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/hrtimer.h')
-rw-r--r--include/linux/hrtimer.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 0853f52f8ffb..e5c22d611850 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -130,6 +130,12 @@ struct hrtimer_sleeper {
struct task_struct *task;
};
+#ifdef CONFIG_64BIT
+# define HRTIMER_CLOCK_BASE_ALIGN 64
+#else
+# define HRTIMER_CLOCK_BASE_ALIGN 32
+#endif
+
/**
* struct hrtimer_clock_base - the timer base for a specific clock
* @cpu_base: per cpu clock base
@@ -147,7 +153,7 @@ struct hrtimer_clock_base {
struct timerqueue_head active;
ktime_t (*get_time)(void);
ktime_t offset;
-};
+} __attribute__((__aligned__(HRTIMER_CLOCK_BASE_ALIGN)));
enum hrtimer_base_type {
HRTIMER_BASE_MONOTONIC,
@@ -195,6 +201,8 @@ struct hrtimer_cpu_base {
static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time)
{
+ BUILD_BUG_ON(sizeof(struct hrtimer_clock_base) > HRTIMER_CLOCK_BASE_ALIGN);
+
timer->node.expires = time;
timer->_softexpires = time;
}