struct take_cpu_down_param *param = _param;
int err;
- raw_notifier_call_chain(&cpu_chain, CPU_DYING | param->mod,
- param->hcpu);
/* Ensure this CPU doesn't handle any more interrupts. */
err = __cpu_disable();
if (err < 0)
return err;
+ raw_notifier_call_chain(&cpu_chain, CPU_DYING | param->mod,
+ param->hcpu);
+
/* Force idle task to run as soon as we yield: it should
immediately notice cpu is offline and die quickly. */
sched_idle_next();
static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
{
int err, nr_calls = 0;
- struct task_struct *p;
cpumask_t old_allowed, tmp;
void *hcpu = (void *)(long)cpu;
unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0;
cpus_setall(tmp);
cpu_clear(cpu, tmp);
set_cpus_allowed_ptr(current, &tmp);
+ tmp = cpumask_of_cpu(cpu);
- p = __stop_machine_run(take_cpu_down, &tcd_param, cpu);
-
- if (IS_ERR(p) || cpu_online(cpu)) {
+ err = __stop_machine(take_cpu_down, &tcd_param, &tmp);
+ if (err) {
/* CPU didn't die: tell everyone. Can't complain. */
if (raw_notifier_call_chain(&cpu_chain, CPU_DOWN_FAILED | mod,
hcpu) == NOTIFY_BAD)
BUG();
- if (IS_ERR(p)) {
- err = PTR_ERR(p);
- goto out_allowed;
- }
- goto out_thread;
+ goto out_allowed;
}
+ BUG_ON(cpu_online(cpu));
/* Wait for it to sleep (leaving idle task). */
while (!idle_cpu(cpu))
check_for_tasks(cpu);
-out_thread:
- err = kthread_stop(p);
out_allowed:
set_cpus_allowed_ptr(current, &old_allowed);
out_release:
goto out_notify;
BUG_ON(!cpu_online(cpu));
+ cpu_set(cpu, cpu_active_map);
+
/* Now call notifier in preparation. */
raw_notifier_call_chain(&cpu_chain, CPU_ONLINE | mod, hcpu);
if (!cpu_isset(cpu, cpu_possible_map)) {
printk(KERN_ERR "can't online cpu %d because it is not "
"configured as may-hotadd at boot time\n", cpu);
-#if defined(CONFIG_IA64) || defined(CONFIG_X86_64) || defined(CONFIG_S390)
+#if defined(CONFIG_IA64) || defined(CONFIG_X86_64)
printk(KERN_ERR "please check additional_cpus= boot "
"parameter\n");
#endif
err = _cpu_up(cpu, 0);
- if (cpu_online(cpu))
- cpu_set(cpu, cpu_active_map);
-
out:
cpu_maps_update_done();
return err;
}
#endif /* CONFIG_PM_SLEEP_SMP */
+/**
+ * notify_cpu_starting(cpu) - call the CPU_STARTING notifiers
+ * @cpu: cpu that just started
+ *
+ * This function calls the cpu_chain notifiers with CPU_STARTING.
+ * It must be called by the arch code on the new cpu, before the new cpu
+ * enables interrupts and before the "boot" cpu returns from __cpu_up().
+ */
+void __cpuinit notify_cpu_starting(unsigned int cpu)
+{
+ unsigned long val = CPU_STARTING;
+
+#ifdef CONFIG_PM_SLEEP_SMP
+ if (cpu_isset(cpu, frozen_cpus))
+ val = CPU_STARTING_FROZEN;
+#endif /* CONFIG_PM_SLEEP_SMP */
+ raw_notifier_call_chain(&cpu_chain, val, (void *)(long)cpu);
+}
+
#endif /* CONFIG_SMP */
-#ifndef CONFIG_HAVE_CPUMASK_OF_CPU_MAP
-/* 64 bits of zeros, for initializers. */
-#if BITS_PER_LONG == 32
-#define Z64 0, 0
-#else
-#define Z64 0
-#endif
+/*
+ * cpu_bit_bitmap[] is a special, "compressed" data structure that
+ * represents all NR_CPUS bits binary values of 1<<nr.
+ *
+ * It is used by cpumask_of_cpu() to get a constant address to a CPU
+ * mask value that has a single bit set only.
+ */
-/* Initializer macros. */
-#define CMI0(n) { .bits = { 1UL << (n) } }
-#define CMI(n, ...) { .bits = { __VA_ARGS__, 1UL << ((n) % BITS_PER_LONG) } }
-
-#define CMI8(n, ...) \
- CMI((n), __VA_ARGS__), CMI((n)+1, __VA_ARGS__), \
- CMI((n)+2, __VA_ARGS__), CMI((n)+3, __VA_ARGS__), \
- CMI((n)+4, __VA_ARGS__), CMI((n)+5, __VA_ARGS__), \
- CMI((n)+6, __VA_ARGS__), CMI((n)+7, __VA_ARGS__)
-
-#if BITS_PER_LONG == 32
-#define CMI64(n, ...) \
- CMI8((n), __VA_ARGS__), CMI8((n)+8, __VA_ARGS__), \
- CMI8((n)+16, __VA_ARGS__), CMI8((n)+24, __VA_ARGS__), \
- CMI8((n)+32, 0, __VA_ARGS__), CMI8((n)+40, 0, __VA_ARGS__), \
- CMI8((n)+48, 0, __VA_ARGS__), CMI8((n)+56, 0, __VA_ARGS__)
-#else
-#define CMI64(n, ...) \
- CMI8((n), __VA_ARGS__), CMI8((n)+8, __VA_ARGS__), \
- CMI8((n)+16, __VA_ARGS__), CMI8((n)+24, __VA_ARGS__), \
- CMI8((n)+32, __VA_ARGS__), CMI8((n)+40, __VA_ARGS__), \
- CMI8((n)+48, __VA_ARGS__), CMI8((n)+56, __VA_ARGS__)
-#endif
+/* cpu_bit_bitmap[0] is empty - so we can back into it */
+#define MASK_DECLARE_1(x) [x+1][0] = 1UL << (x)
+#define MASK_DECLARE_2(x) MASK_DECLARE_1(x), MASK_DECLARE_1(x+1)
+#define MASK_DECLARE_4(x) MASK_DECLARE_2(x), MASK_DECLARE_2(x+2)
+#define MASK_DECLARE_8(x) MASK_DECLARE_4(x), MASK_DECLARE_4(x+4)
-#define CMI256(n, ...) \
- CMI64((n), __VA_ARGS__), CMI64((n)+64, Z64, __VA_ARGS__), \
- CMI64((n)+128, Z64, Z64, __VA_ARGS__), \
- CMI64((n)+192, Z64, Z64, Z64, __VA_ARGS__)
-#define Z256 Z64, Z64, Z64, Z64
-
-#define CMI1024(n, ...) \
- CMI256((n), __VA_ARGS__), \
- CMI256((n)+256, Z256, __VA_ARGS__), \
- CMI256((n)+512, Z256, Z256, __VA_ARGS__), \
- CMI256((n)+768, Z256, Z256, Z256, __VA_ARGS__)
-#define Z1024 Z256, Z256, Z256, Z256
-
-/* We want this statically initialized, just to be safe. We try not
- * to waste too much space, either. */
-static const cpumask_t cpumask_map[] = {
- CMI0(0), CMI0(1), CMI0(2), CMI0(3),
-#if NR_CPUS > 4
- CMI0(4), CMI0(5), CMI0(6), CMI0(7),
-#endif
-#if NR_CPUS > 8
- CMI0(8), CMI0(9), CMI0(10), CMI0(11),
- CMI0(12), CMI0(13), CMI0(14), CMI0(15),
-#endif
-#if NR_CPUS > 16
- CMI0(16), CMI0(17), CMI0(18), CMI0(19),
- CMI0(20), CMI0(21), CMI0(22), CMI0(23),
- CMI0(24), CMI0(25), CMI0(26), CMI0(27),
- CMI0(28), CMI0(29), CMI0(30), CMI0(31),
-#endif
-#if NR_CPUS > 32
-#if BITS_PER_LONG == 32
- CMI(32, 0), CMI(33, 0), CMI(34, 0), CMI(35, 0),
- CMI(36, 0), CMI(37, 0), CMI(38, 0), CMI(39, 0),
- CMI(40, 0), CMI(41, 0), CMI(42, 0), CMI(43, 0),
- CMI(44, 0), CMI(45, 0), CMI(46, 0), CMI(47, 0),
- CMI(48, 0), CMI(49, 0), CMI(50, 0), CMI(51, 0),
- CMI(52, 0), CMI(53, 0), CMI(54, 0), CMI(55, 0),
- CMI(56, 0), CMI(57, 0), CMI(58, 0), CMI(59, 0),
- CMI(60, 0), CMI(61, 0), CMI(62, 0), CMI(63, 0),
-#else
- CMI0(32), CMI0(33), CMI0(34), CMI0(35),
- CMI0(36), CMI0(37), CMI0(38), CMI0(39),
- CMI0(40), CMI0(41), CMI0(42), CMI0(43),
- CMI0(44), CMI0(45), CMI0(46), CMI0(47),
- CMI0(48), CMI0(49), CMI0(50), CMI0(51),
- CMI0(52), CMI0(53), CMI0(54), CMI0(55),
- CMI0(56), CMI0(57), CMI0(58), CMI0(59),
- CMI0(60), CMI0(61), CMI0(62), CMI0(63),
-#endif /* BITS_PER_LONG == 64 */
-#endif
-#if NR_CPUS > 64
- CMI64(64, Z64),
-#endif
-#if NR_CPUS > 128
- CMI64(128, Z64, Z64), CMI64(192, Z64, Z64, Z64),
-#endif
-#if NR_CPUS > 256
- CMI256(256, Z256),
-#endif
-#if NR_CPUS > 512
- CMI256(512, Z256, Z256), CMI256(768, Z256, Z256, Z256),
-#endif
-#if NR_CPUS > 1024
- CMI1024(1024, Z1024),
-#endif
-#if NR_CPUS > 2048
- CMI1024(2048, Z1024, Z1024), CMI1024(3072, Z1024, Z1024, Z1024),
-#endif
-#if NR_CPUS > 4096
-#error NR_CPUS too big. Fix initializers or set CONFIG_HAVE_CPUMASK_OF_CPU_MAP
+const unsigned long cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)] = {
+
+ MASK_DECLARE_8(0), MASK_DECLARE_8(8),
+ MASK_DECLARE_8(16), MASK_DECLARE_8(24),
+#if BITS_PER_LONG > 32
+ MASK_DECLARE_8(32), MASK_DECLARE_8(40),
+ MASK_DECLARE_8(48), MASK_DECLARE_8(56),
#endif
};
+EXPORT_SYMBOL_GPL(cpu_bit_bitmap);
-const cpumask_t *cpumask_of_cpu_map = cpumask_map;
-#endif /* !CONFIG_HAVE_CPUMASK_OF_CPU_MAP */
+const DECLARE_BITMAP(cpu_all_bits, NR_CPUS) = CPU_BITS_ALL;
+EXPORT_SYMBOL(cpu_all_bits);
projects / h-e-n / blobdiff