x86: fix lguest used_vectors breakage, -v2

Impact: fix lguest, clean up

32-bit lguest used used_vectors to record vectors, but that model of
allocating vectors changed and got broken, after we changed vector
allocation to a per_cpu array.

Try enable that for 64bit, and the array is used for all vectors that
are not managed by vector_irq per_cpu array.

Also kill system_vectors[], that is now a duplication of the
used_vectors bitmap.

[ merged in cpus4096 due to io_apic.c cpumask changes. ]
[ -v2, fix build failure ]

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 9 insertions, 4 deletions

diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c
index a1039068f95..415fab0125a 100644
--- a/drivers/lguest/interrupts_and_traps.c
+++ b/drivers/lguest/interrupts_and_traps.c
@@ -222,11 +222,16 @@ bool check_syscall_vector(struct lguest *lg)
 int init_interrupts(void)
 {
         /* If they want some strange system call vector, reserve it now */
-        if (syscall_vector != SYSCALL_VECTOR
-            && test_and_set_bit(syscall_vector, used_vectors)) {
-                printk("lg: couldn't reserve syscall %u\n", syscall_vector);
-                return -EBUSY;
+        if (syscall_vector != SYSCALL_VECTOR) {
+                if (test_bit(syscall_vector, used_vectors) ||
+                    vector_used_by_percpu_irq(syscall_vector)) {
+                        printk(KERN_ERR "lg: couldn't reserve syscall %u\n",
+                                 syscall_vector);
+                        return -EBUSY;
+                }
+                set_bit(syscall_vector, used_vectors);
         }
+
         return 0;
 }