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>

1 files changed, 5 insertions, 3 deletions

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index feb2dbdae9ec..e3fecd50d5ca 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -306,7 +306,7 @@ struct apic {
         unsigned long (*check_apicid_used)(physid_mask_t *map, int apicid);
         unsigned long (*check_apicid_present)(int apicid);
 
-        void (*vector_allocation_domain)(int cpu, struct cpumask *retmask);
+        bool (*vector_allocation_domain)(int cpu, struct cpumask *retmask);
         void (*init_apic_ldr)(void);
 
         void (*ioapic_phys_id_map)(physid_mask_t *phys_map, physid_mask_t *retmap);
@@ -615,7 +615,7 @@ extern unsigned int
 default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
                                const struct cpumask *andmask);
 
-static inline void
+static inline bool
 flat_vector_allocation_domain(int cpu, struct cpumask *retmask)
 {
         /* Careful. Some cpus do not strictly honor the set of cpus
@@ -628,12 +628,14 @@ flat_vector_allocation_domain(int cpu, struct cpumask *retmask)
          */
         cpumask_clear(retmask);
         cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
+        return false;
 }
 
-static inline void
+static inline bool
 default_vector_allocation_domain(int cpu, struct cpumask *retmask)
 {
         cpumask_copy(retmask, cpumask_of(cpu));
+        return true;
 }
 
 static inline unsigned long default_check_apicid_used(physid_mask_t *map, int apicid)