x86/irq: Reorganize the search in assign_irq_vector

Split out the code which advances the target cpu for the search so we can
reuse it for the next patch which adds an early validation check for the
vectormask which we get from the apic.

Add comments while at it.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Borislav Petkov <bp@alien8.de>
Tested-by: Joe Lawrence <joe.lawrence@stratus.com>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Jeremiah Mahler <jmmahler@gmail.com>
Cc: andy.shevchenko@gmail.com
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: stable@vger.kernel.org #4.3+
Link: http://lkml.kernel.org/r/20151231160106.484562040@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index 613b1cd8eecb1838a0963539a9af5aee1c42cbaf..cef31955ab18b65f2217af934636a12f762e249b 100644 (file)
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -157,14 +157,9 @@ next:
                        vector = FIRST_EXTERNAL_VECTOR + offset;
                }
 
-               if (unlikely(current_vector == vector)) {
-                       cpumask_or(searched_cpumask, searched_cpumask,
-                                  vector_cpumask);
-                       cpumask_andnot(vector_cpumask, mask, searched_cpumask);
-                       cpu = cpumask_first_and(vector_cpumask,
-                                               cpu_online_mask);
-                       continue;
-               }
+               /* If the search wrapped around, try the next cpu */
+               if (unlikely(current_vector == vector))
+                       goto next_cpu;
 
                if (test_bit(vector, used_vectors))
                        goto next;
@@ -186,6 +181,19 @@ next:
                d->cfg.vector = vector;
                cpumask_copy(d->domain, vector_cpumask);
                goto success;
+
+next_cpu:
+               /*
+                * We exclude the current @vector_cpumask from the requested
+                * @mask and try again with the next online cpu in the
+                * result. We cannot modify @mask, so we use @vector_cpumask
+                * as a temporary buffer here as it will be reassigned when
+                * calling apic->vector_allocation_domain() above.
+                */
+               cpumask_or(searched_cpumask, searched_cpumask, vector_cpumask);
+               cpumask_andnot(vector_cpumask, mask, searched_cpumask);
+               cpu = cpumask_first_and(vector_cpumask, cpu_online_mask);
+               continue;
        }
        return -ENOSPC;