diff options
| -rw-r--r-- | kernel/time/timer.c | 48 |
1 files changed, 19 insertions, 29 deletions
diff --git a/kernel/time/timer.c b/kernel/time/timer.c index 2d3f5c504939..f3cc653f876c 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -90,8 +90,19 @@ struct tvec_base { struct tvec tv5; } ____cacheline_aligned; +/* + * __TIMER_INITIALIZER() needs to set ->base to a valid pointer (because we've + * made NULL special, hint: lock_timer_base()) and we cannot get a compile time + * pointer to per-cpu entries because we don't know where we'll map the section, + * even for the boot cpu. + * + * And so we use boot_tvec_bases for boot CPU and per-cpu __tvec_bases for the + * rest of them. + */ struct tvec_base boot_tvec_bases; EXPORT_SYMBOL(boot_tvec_bases); +static DEFINE_PER_CPU(struct tvec_base, __tvec_bases); + static DEFINE_PER_CPU(struct tvec_base *, tvec_bases) = &boot_tvec_bases; /* Functions below help us manage 'deferrable' flag */ @@ -1534,46 +1545,25 @@ EXPORT_SYMBOL(schedule_timeout_uninterruptible); static int init_timers_cpu(int cpu) { - int j; - struct tvec_base *base; + struct tvec_base *base = per_cpu(tvec_bases, cpu); static char tvec_base_done[NR_CPUS]; + int j; if (!tvec_base_done[cpu]) { - static char boot_done; + static char boot_cpu_skipped; - if (boot_done) { - /* - * The APs use this path later in boot - */ - base = kzalloc_node(sizeof(*base), GFP_KERNEL, - cpu_to_node(cpu)); - if (!base) - return -ENOMEM; - - /* Make sure tvec_base has TIMER_FLAG_MASK bits free */ - if (WARN_ON(base != tbase_get_base(base))) { - kfree(base); - return -ENOMEM; - } - per_cpu(tvec_bases, cpu) = base; + if (!boot_cpu_skipped) { + boot_cpu_skipped = 1; /* skip the boot cpu */ } else { - /* - * This is for the boot CPU - we use compile-time - * static initialisation because per-cpu memory isn't - * ready yet and because the memory allocators are not - * initialised either. - */ - boot_done = 1; - base = &boot_tvec_bases; + base = per_cpu_ptr(&__tvec_bases, cpu); + per_cpu(tvec_bases, cpu) = base; } + spin_lock_init(&base->lock); tvec_base_done[cpu] = 1; base->cpu = cpu; - } else { - base = per_cpu(tvec_bases, cpu); } - for (j = 0; j < TVN_SIZE; j++) { INIT_LIST_HEAD(base->tv5.vec + j); INIT_LIST_HEAD(base->tv4.vec + j); |