2 * SMP stuff which is common to all sub-architectures.
4 #include <linux/module.h>
7 DEFINE_PER_CPU(unsigned long, this_cpu_off
);
8 EXPORT_PER_CPU_SYMBOL(this_cpu_off
);
10 /* Initialize the CPU's GDT. This is either the boot CPU doing itself
11 (still using the master per-cpu area), or a CPU doing it for a
12 secondary which will soon come up. */
13 __cpuinit
void init_gdt(int cpu
)
15 struct desc_struct
*gdt
= get_cpu_gdt_table(cpu
);
17 pack_descriptor((u32
*)&gdt
[GDT_ENTRY_PERCPU
].a
,
18 (u32
*)&gdt
[GDT_ENTRY_PERCPU
].b
,
19 __per_cpu_offset
[cpu
], 0xFFFFF,
20 0x80 | DESCTYPE_S
| 0x2, 0x8);
22 per_cpu(this_cpu_off
, cpu
) = __per_cpu_offset
[cpu
];
23 per_cpu(cpu_number
, cpu
) = cpu
;
28 * smp_call_function(): Run a function on all other CPUs.
29 * @func: The function to run. This must be fast and non-blocking.
30 * @info: An arbitrary pointer to pass to the function.
32 * @wait: If true, wait (atomically) until function has completed on other CPUs.
34 * Returns 0 on success, else a negative status code.
36 * If @wait is true, then returns once @func has returned; otherwise
37 * it returns just before the target cpu calls @func.
39 * You must not call this function with disabled interrupts or from a
40 * hardware interrupt handler or from a bottom half handler.
42 int smp_call_function(void (*func
) (void *info
), void *info
, int nonatomic
,
45 return smp_call_function_mask(cpu_online_map
, func
, info
, wait
);
47 EXPORT_SYMBOL(smp_call_function
);
50 * smp_call_function_single - Run a function on a specific CPU
51 * @cpu: The target CPU. Cannot be the calling CPU.
52 * @func: The function to run. This must be fast and non-blocking.
53 * @info: An arbitrary pointer to pass to the function.
55 * @wait: If true, wait until function has completed on other CPUs.
57 * Returns 0 on success, else a negative status code.
59 * If @wait is true, then returns once @func has returned; otherwise
60 * it returns just before the target cpu calls @func.
62 int smp_call_function_single(int cpu
, void (*func
) (void *info
), void *info
,
63 int nonatomic
, int wait
)
65 /* prevent preemption and reschedule on another processor */
76 ret
= smp_call_function_mask(cpumask_of_cpu(cpu
), func
, info
, wait
);
81 EXPORT_SYMBOL(smp_call_function_single
);
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