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authorTejun Heo <tj@kernel.org>2012-08-08 11:10:25 -0700
committerThomas Gleixner <tglx@linutronix.de>2012-08-21 16:28:30 +0200
commite52b1db37b89b69ceb08b521a808bd2cf4724481 (patch)
tree9f37d5060e57f1b2746047c204b1c96725463f39 /kernel/timer.c
parenteec19d1a0d04c80e66eef634f7b8f460f2ca5643 (diff)
downloadlinux-e52b1db37b89b69ceb08b521a808bd2cf4724481.tar.bz2
timer: Generalize timer->base flags handling
To prepare for addition of another flag, generalize timer->base flags handling. * Rename from TBASE_*_FLAG to TIMER_* and make them LU constants. * Define and use TIMER_FLAG_MASK for flags masking so that multiple flags can be handled correctly. * Don't dereference timer->base directly even if !tbase_get_deferrable(). All two such places are already passed in @base, so use it instead. * Make sure tvec_base's alignment is large enough for timer->base flags using BUILD_BUG_ON(). Signed-off-by: Tejun Heo <tj@kernel.org> Cc: torvalds@linux-foundation.org Cc: peterz@infradead.org Link: http://lkml.kernel.org/r/1344449428-24962-2-git-send-email-tj@kernel.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/timer.c')
-rw-r--r--kernel/timer.c21
1 files changed, 13 insertions, 8 deletions
diff --git a/kernel/timer.c b/kernel/timer.c
index a61c09374eba..cf7af56940b7 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -92,12 +92,12 @@ static DEFINE_PER_CPU(struct tvec_base *, tvec_bases) = &boot_tvec_bases;
/* Functions below help us manage 'deferrable' flag */
static inline unsigned int tbase_get_deferrable(struct tvec_base *base)
{
- return ((unsigned int)(unsigned long)base & TBASE_DEFERRABLE_FLAG);
+ return ((unsigned int)(unsigned long)base & TIMER_DEFERRABLE);
}
static inline struct tvec_base *tbase_get_base(struct tvec_base *base)
{
- return ((struct tvec_base *)((unsigned long)base & ~TBASE_DEFERRABLE_FLAG));
+ return ((struct tvec_base *)((unsigned long)base & ~TIMER_FLAG_MASK));
}
static inline void timer_set_deferrable(struct timer_list *timer)
@@ -108,8 +108,9 @@ static inline void timer_set_deferrable(struct timer_list *timer)
static inline void
timer_set_base(struct timer_list *timer, struct tvec_base *new_base)
{
- timer->base = (struct tvec_base *)((unsigned long)(new_base) |
- tbase_get_deferrable(timer->base));
+ unsigned long flags = (unsigned long)timer->base & TIMER_FLAG_MASK;
+
+ timer->base = (struct tvec_base *)((unsigned long)(new_base) | flags);
}
static unsigned long round_jiffies_common(unsigned long j, int cpu,
@@ -686,7 +687,7 @@ detach_expired_timer(struct timer_list *timer, struct tvec_base *base)
{
detach_timer(timer, true);
if (!tbase_get_deferrable(timer->base))
- timer->base->active_timers--;
+ base->active_timers--;
}
static int detach_if_pending(struct timer_list *timer, struct tvec_base *base,
@@ -697,7 +698,7 @@ static int detach_if_pending(struct timer_list *timer, struct tvec_base *base,
detach_timer(timer, clear_pending);
if (!tbase_get_deferrable(timer->base)) {
- timer->base->active_timers--;
+ base->active_timers--;
if (timer->expires == base->next_timer)
base->next_timer = base->timer_jiffies;
}
@@ -1800,9 +1801,13 @@ static struct notifier_block __cpuinitdata timers_nb = {
void __init init_timers(void)
{
- int err = timer_cpu_notify(&timers_nb, (unsigned long)CPU_UP_PREPARE,
- (void *)(long)smp_processor_id());
+ int err;
+
+ /* ensure there are enough low bits for flags in timer->base pointer */
+ BUILD_BUG_ON(__alignof__(struct tvec_base) & TIMER_FLAG_MASK);
+ err = timer_cpu_notify(&timers_nb, (unsigned long)CPU_UP_PREPARE,
+ (void *)(long)smp_processor_id());
init_timer_stats();
BUG_ON(err != NOTIFY_OK);