diff options
Diffstat (limited to 'arch/powerpc/kernel/smp.c')
| -rw-r--r-- | arch/powerpc/kernel/smp.c | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index 793401e..e6f5d08 100644 --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c @@ -81,6 +81,29 @@ int smt_enabled_at_boot = 1; static void (*crash_ipi_function_ptr)(struct pt_regs *) = NULL; +/* + * Returns 1 if the specified cpu should be brought up during boot. + * Used to inhibit booting threads if they've been disabled or + * limited on the command line + */ +int smp_generic_cpu_bootable(unsigned int nr) +{ + /* Special case - we inhibit secondary thread startup + * during boot if the user requests it. + */ + if (system_state < SYSTEM_RUNNING && cpu_has_feature(CPU_FTR_SMT)) { + if (!smt_enabled_at_boot && cpu_thread_in_core(nr) != 0) + return 0; + if (smt_enabled_at_boot + && cpu_thread_in_core(nr) >= smt_enabled_at_boot) + return 0; + } + + return 1; +} +EXPORT_SYMBOL(smp_generic_cpu_bootable); + + #ifdef CONFIG_PPC64 int smp_generic_kick_cpu(int nr) { @@ -381,14 +404,31 @@ int generic_cpu_disable(void) return 0; } +/** + * platform_cpu_die() - do platform related operations on the boot cpu, after + * the cpu_state of the dying cpu is assigned to CPU_DEAD. Platform + * implementations can override this. + * + * @cpu: the cpu to die + */ +void __attribute__ ((weak)) platform_cpu_die(unsigned int cpu) +{ + return; +} + void generic_cpu_die(unsigned int cpu) { int i; for (i = 0; i < 100; i++) { smp_rmb(); - if (per_cpu(cpu_state, cpu) == CPU_DEAD) + if (per_cpu(cpu_state, cpu) == CPU_DEAD) { + platform_cpu_die(cpu); +#ifdef CONFIG_PPC64 + paca[cpu].cpu_start = 0; +#endif return; + } msleep(100); } printk(KERN_ERR "CPU%d didn't die...\n", cpu); |