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MIPS: Add arch generic CPU hotplug

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Each platform has to add support for CPU hotplugging itself by providing
suitable definitions for the cpu_disable and cpu_die of the smp_ops
methods and setting SYS_SUPPORTS_HOTPLUG_CPU.  A platform should only set
SYS_SUPPORTS_HOTPLUG_CPU once all it's smp_ops definitions have the
necessary changes.  This patch contains the changes to the dummy smp_ops
definition for uni-processor systems.

Parts of the code contributed by Cavium Inc.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle
2009-06-23 10:00:31 +01:00
parent 4ac4aa5cc3
commit 1b2bc75c1b
7 changed files with 78 additions and 7 deletions
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17
arch/mips/kernel/smp.c
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@@ -45,7 +45,7 @@
#include <asm/mipsmtregs.h>
#endif /* CONFIG_MIPS_MT_SMTC */
static volatile cpumask_t cpu_callin_map; /* Bitmask of started secondaries */
volatile cpumask_t cpu_callin_map; /* Bitmask of started secondaries */
int __cpu_number_map[NR_CPUS]; /* Map physical to logical */
int __cpu_logical_map[NR_CPUS]; /* Map logical to physical */
@@ -201,6 +201,8 @@ void __devinit smp_prepare_boot_cpu(void)
* and keep control until "cpu_online(cpu)" is set. Note: cpu is
* physical, not logical.
*/
static struct task_struct *cpu_idle_thread[NR_CPUS];
int __cpuinit __cpu_up(unsigned int cpu)
{
struct task_struct *idle;
@@ -210,9 +212,16 @@ int __cpuinit __cpu_up(unsigned int cpu)
* The following code is purely to make sure
* Linux can schedule processes on this slave.
*/
idle = fork_idle(cpu);
if (IS_ERR(idle))
panic(KERN_ERR "Fork failed for CPU %d", cpu);
if (!cpu_idle_thread[cpu]) {
idle = fork_idle(cpu);
cpu_idle_thread[cpu] = idle;
if (IS_ERR(idle))
panic(KERN_ERR "Fork failed for CPU %d", cpu);
} else {
idle = cpu_idle_thread[cpu];
init_idle(idle, cpu);
}
mp_ops->boot_secondary(cpu, idle);