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powerpc: Update cpu_sibling_maps dynamically

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Rather doing one initialization pass over all the per-cpu
cpu_sibling_maps at boot, update the maps at cpu online/offline time.

This is a behavior change -- the thread_siblings attribute now
reflects only online siblings, whereas it would display offline
siblings before.  The new behavior matches that of x86, and is
arguably more useful.

Signed-off-by: Nathan Lynch <ntl@pobox.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Nathan Lynch 2008-07-27 15:24:52 +10:00 • committed by Benjamin Herrenschmidt
parent 9ba1984ead
commit e2075f79a9
3 changed files with 29 additions and 30 deletions
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24
arch/powerpc/kernel/setup-common.c
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@ -367,7 +367,6 @@ static void __init cpu_init_thread_core_maps(int tpc)
* setup_cpu_maps - initialize the following cpu maps:
* cpu_possible_map
* cpu_present_map
* cpu_sibling_map
*
* Having the possible map set up early allows us to restrict allocations
* of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
@ -475,29 +474,6 @@ void __init smp_setup_cpu_maps(void)
*/
cpu_init_thread_core_maps(nthreads);
}
/*
* Being that cpu_sibling_map is now a per_cpu array, then it cannot
* be initialized until the per_cpu areas have been created. This
* function is now called from setup_per_cpu_areas().
*/
void __init smp_setup_cpu_sibling_map(void)
{
#ifdef CONFIG_PPC64
int i, cpu, base;
for_each_possible_cpu(cpu) {
DBG("Sibling map for CPU %d:", cpu);
base = cpu_first_thread_in_core(cpu);
for (i = 0; i < threads_per_core; i++) {
cpu_set(base + i, per_cpu(cpu_sibling_map, cpu));
DBG(" %d", base + i);
}
DBG("\n");
}
#endif /* CONFIG_PPC64 */
}
#endif /* CONFIG_SMP */
#ifdef CONFIG_PCSPKR_PLATFORM