x86/apic: Avoid useless scanning thru a cpumask in assign_irq_vector()

In case of static vector allocation domains (i.e. flat) if all
vector numbers are exhausted, an attempt to assign a new vector
will lead to useless scans through all CPUs in the cpumask, even
though it is known that each new pass would fail. Make this
corner case less painful by letting report whether the vector
allocation domain depends on passed arguments or not and stop
scanning early.

The same could have been achived by introducing a static flag to
the apic operations. But let's allow vector_allocation_domain()
have more intelligence here and decide dynamically, in case we
would need it in the future.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/20120607131542.GE4759@dhcp-26-207.brq.redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2 files changed, 11 insertions, 4 deletions

diff --git a/arch/x86/kernel/apic/apic_noop.c b/arch/x86/kernel/apic/apic_noop.c
index 3e43cf52893..ac9edf247b1 100644
--- a/arch/x86/kernel/apic/apic_noop.c
+++ b/arch/x86/kernel/apic/apic_noop.c
@@ -100,11 +100,12 @@ static unsigned long noop_check_apicid_present(int bit)
         return physid_isset(bit, phys_cpu_present_map);
 }
 
-static void noop_vector_allocation_domain(int cpu, struct cpumask *retmask)
+static bool noop_vector_allocation_domain(int cpu, struct cpumask *retmask)
 {
         if (cpu != 0)
                 pr_warning("APIC: Vector allocated for non-BSP cpu\n");
         cpumask_copy(retmask, cpumask_of(cpu));
+        return true;
 }
 
 static u32 noop_apic_read(u32 reg)
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 05af3d341aa..4061a7dee5c 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1137,8 +1137,9 @@ __assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask)
         for_each_cpu_and(cpu, mask, cpu_online_mask) {
                 int new_cpu;
                 int vector, offset;
+                bool more_domains;
 
-                apic->vector_allocation_domain(cpu, tmp_mask);
+                more_domains = apic->vector_allocation_domain(cpu, tmp_mask);
 
                 if (cpumask_subset(tmp_mask, cfg->domain)) {
                         free_cpumask_var(tmp_mask);
@@ -1153,8 +1154,13 @@ next:
                         offset = (offset + 1) % 16;
                         vector = FIRST_EXTERNAL_VECTOR + offset;
                 }
-                if (unlikely(current_vector == vector))
-                        continue;
+
+                if (unlikely(current_vector == vector)) {
+                        if (more_domains)
+                                continue;
+                        else
+                                break;
+                }
 
                 if (test_bit(vector, used_vectors))
                         goto next;