2.6.27-stable review patch. If anyone has any objections, please let us know. ------------------ From: Heiko Carstens commit 74af283102b358b0da545460d0d176f473e110f6 upstream. cpu_coregroup_map used to grab a mutex on s390 since it was only called from process context. Since c7c22e4d5c1fdebfac4dba76de7d0338c2b0d832 "block: add support for IO CPU affinity" this is not true anymore. It now also gets called from softirq context. To prevent possible deadlocks change this in architecture code and use a spinlock instead of a mutex. Cc: Jens Axboe Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky Signed-off-by: Greg Kroah-Hartman --- arch/s390/kernel/topology.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) --- a/arch/s390/kernel/topology.c +++ b/arch/s390/kernel/topology.c @@ -65,18 +65,21 @@ static int machine_has_topology_irq; static struct timer_list topology_timer; static void set_topology_timer(void); static DECLARE_WORK(topology_work, topology_work_fn); +/* topology_lock protects the core linked list */ +static DEFINE_SPINLOCK(topology_lock); cpumask_t cpu_core_map[NR_CPUS]; cpumask_t cpu_coregroup_map(unsigned int cpu) { struct core_info *core = &core_info; + unsigned long flags; cpumask_t mask; cpus_clear(mask); if (!machine_has_topology) return cpu_present_map; - mutex_lock(&smp_cpu_state_mutex); + spin_lock_irqsave(&topology_lock, flags); while (core) { if (cpu_isset(cpu, core->mask)) { mask = core->mask; @@ -84,7 +87,7 @@ cpumask_t cpu_coregroup_map(unsigned int } core = core->next; } - mutex_unlock(&smp_cpu_state_mutex); + spin_unlock_irqrestore(&topology_lock, flags); if (cpus_empty(mask)) mask = cpumask_of_cpu(cpu); return mask; @@ -133,7 +136,7 @@ static void tl_to_cores(struct tl_info * union tl_entry *tle, *end; struct core_info *core = &core_info; - mutex_lock(&smp_cpu_state_mutex); + spin_lock_irq(&topology_lock); clear_cores(); tle = info->tle; end = (union tl_entry *)((unsigned long)info + info->length); @@ -157,7 +160,7 @@ static void tl_to_cores(struct tl_info * } tle = next_tle(tle); } - mutex_unlock(&smp_cpu_state_mutex); + spin_unlock_irq(&topology_lock); } static void topology_update_polarization_simple(void) -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/