x86: Wait for curthread to be set up as an indicator that the boot stack
is no longer used. pc_curthread is set by cpu_switch after it stopped using the old thread (or boot) stack. This makes the smp_after_idle_runnable() function not dependent on the internals of the scheduler operations. Reviewed by: markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D23276
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=356919
@ -1092,13 +1092,12 @@ init_secondary_tail(void)
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static void
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smp_after_idle_runnable(void *arg __unused)
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{
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struct thread *idle_td;
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struct pcpu *pc;
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int cpu;
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for (cpu = 1; cpu < mp_ncpus; cpu++) {
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idle_td = pcpu_find(cpu)->pc_idlethread;
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while (atomic_load_int(&idle_td->td_lastcpu) == NOCPU &&
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atomic_load_int(&idle_td->td_oncpu) == NOCPU)
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pc = pcpu_find(cpu);
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while (atomic_load_ptr(&pc->pc_curthread) == (uintptr_t)NULL)
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cpu_spinwait();
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kmem_free((vm_offset_t)bootstacks[cpu], kstack_pages *
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PAGE_SIZE);
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