diff options
Diffstat (limited to 'arch/mips/kernel/smp.c')
| -rw-r--r-- | arch/mips/kernel/smp.c | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c index 6e71130549ea..aba1afb64b62 100644 --- a/arch/mips/kernel/smp.c +++ b/arch/mips/kernel/smp.c @@ -261,16 +261,20 @@ int mips_smp_ipi_allocate(const struct cpumask *mask) ipidomain = irq_find_matching_host(NULL, DOMAIN_BUS_IPI); /* - * There are systems which only use IPI domains some of the time, - * depending upon configuration we don't know until runtime. An - * example is Malta where we may compile in support for GIC & the - * MT ASE, but run on a system which has multiple VPEs in a single - * core and doesn't include a GIC. Until all IPI implementations - * have been converted to use IPI domains the best we can do here - * is to return & hope some other code sets up the IPIs. + * There are systems which use IPI IRQ domains, but only have one + * registered when some runtime condition is met. For example a Malta + * kernel may include support for GIC & CPU interrupt controller IPI + * IRQ domains, but if run on a system with no GIC & no MT ASE then + * neither will be supported or registered. + * + * We only have a problem if we're actually using multiple CPUs so fail + * loudly if that is the case. Otherwise simply return, skipping IPI + * setup, if we're running with only a single CPU. */ - if (!ipidomain) + if (!ipidomain) { + BUG_ON(num_present_cpus() > 1); return 0; + } virq = irq_reserve_ipi(ipidomain, mask); BUG_ON(!virq); |