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yaml
---
r: 196640
b: refs/heads/master
c: 8729faa
h: refs/heads/master
v: v3
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Anton Blanchard authored and Benjamin Herrenschmidt committed May 6, 2010
1 parent 378e464 commit 77434d2
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Showing 2 changed files with 20 additions and 15 deletions.
2 changes: 1 addition & 1 deletion [refs]
Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: cc1ba8ea6dde3f049b2b365d8fdc13976aee25cb
refs/heads/master: 8729faaa5e87557876c02f1665d517e2b41299f1
33 changes: 19 additions & 14 deletions trunk/arch/powerpc/platforms/pseries/hotplug-cpu.c
Original file line number Diff line number Diff line change
Expand Up @@ -163,7 +163,7 @@ static int pseries_cpu_disable(void)

/*fix boot_cpuid here*/
if (cpu == boot_cpuid)
boot_cpuid = any_online_cpu(cpu_online_map);
boot_cpuid = cpumask_any(cpu_online_mask);

/* FIXME: abstract this to not be platform specific later on */
xics_migrate_irqs_away();
Expand Down Expand Up @@ -231,56 +231,61 @@ static void pseries_cpu_die(unsigned int cpu)
static int pseries_add_processor(struct device_node *np)
{
unsigned int cpu;
cpumask_t candidate_map, tmp = CPU_MASK_NONE;
cpumask_var_t candidate_mask, tmp;
int err = -ENOSPC, len, nthreads, i;
const u32 *intserv;

intserv = of_get_property(np, "ibm,ppc-interrupt-server#s", &len);
if (!intserv)
return 0;

zalloc_cpumask_var(&candidate_mask, GFP_KERNEL);
zalloc_cpumask_var(&tmp, GFP_KERNEL);

nthreads = len / sizeof(u32);
for (i = 0; i < nthreads; i++)
cpu_set(i, tmp);
cpumask_set_cpu(i, tmp);

cpu_maps_update_begin();

BUG_ON(!cpus_subset(cpu_present_map, cpu_possible_map));
BUG_ON(!cpumask_subset(cpu_present_mask, cpu_possible_mask));

/* Get a bitmap of unoccupied slots. */
cpus_xor(candidate_map, cpu_possible_map, cpu_present_map);
if (cpus_empty(candidate_map)) {
cpumask_xor(candidate_mask, cpu_possible_mask, cpu_present_mask);
if (cpumask_empty(candidate_mask)) {
/* If we get here, it most likely means that NR_CPUS is
* less than the partition's max processors setting.
*/
printk(KERN_ERR "Cannot add cpu %s; this system configuration"
" supports %d logical cpus.\n", np->full_name,
cpus_weight(cpu_possible_map));
cpumask_weight(cpu_possible_mask));
goto out_unlock;
}

while (!cpus_empty(tmp))
if (cpus_subset(tmp, candidate_map))
while (!cpumask_empty(tmp))
if (cpumask_subset(tmp, candidate_mask))
/* Found a range where we can insert the new cpu(s) */
break;
else
cpus_shift_left(tmp, tmp, nthreads);
cpumask_shift_left(tmp, tmp, nthreads);

if (cpus_empty(tmp)) {
if (cpumask_empty(tmp)) {
printk(KERN_ERR "Unable to find space in cpu_present_map for"
" processor %s with %d thread(s)\n", np->name,
nthreads);
goto out_unlock;
}

for_each_cpu_mask(cpu, tmp) {
BUG_ON(cpu_isset(cpu, cpu_present_map));
for_each_cpu(cpu, tmp) {
BUG_ON(cpumask_test_cpu(cpu, cpu_present_mask));
set_cpu_present(cpu, true);
set_hard_smp_processor_id(cpu, *intserv++);
}
err = 0;
out_unlock:
cpu_maps_update_done();
free_cpumask_var(candidate_mask);
free_cpumask_var(tmp);
return err;
}

Expand Down Expand Up @@ -311,7 +316,7 @@ static void pseries_remove_processor(struct device_node *np)
set_hard_smp_processor_id(cpu, -1);
break;
}
if (cpu == NR_CPUS)
if (cpu >= nr_cpu_ids)
printk(KERN_WARNING "Could not find cpu to remove "
"with physical id 0x%x\n", intserv[i]);
}
Expand Down

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