[GIT PULL] x86/irq change for v4.12

[Ingo Molnar]

Linus,

Please pull the latest x86-irq-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-irq-for-linus

   # HEAD: c0edbd4a1693600d6eb9e2faad452638c35391f7 x86/irq: Optimize free 
vector check in the CPU offline path

A single commit that micro-optimizes an IRQ vectors code path in the CPU 
offlining 
code.

 Thanks,

        Ingo

------------------>
Chen Yu (1):
      x86/irq: Optimize free vector check in the CPU offline path


 arch/x86/kernel/irq.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 4d8183b5f113..f34fe7444836 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -394,6 +394,9 @@ int check_irq_vectors_for_cpu_disable(void)
                    !cpumask_subset(&affinity_new, &online_new))
                        this_count++;
        }
+       /* No need to check any further. */
+       if (!this_count)
+               return 0;
 
        count = 0;
        for_each_online_cpu(cpu) {
@@ -411,8 +414,10 @@ int check_irq_vectors_for_cpu_disable(void)
                for (vector = FIRST_EXTERNAL_VECTOR;
                     vector < first_system_vector; vector++) {
                        if (!test_bit(vector, used_vectors) &&
-                           IS_ERR_OR_NULL(per_cpu(vector_irq, cpu)[vector]))
-                           count++;
+                           IS_ERR_OR_NULL(per_cpu(vector_irq, cpu)[vector])) {
+                               if (++count == this_count)
+                                       return 0;
+                       }
                }
        }