sysemu.h: Document what MAX_CPUMASK_BITS really limits

Signed-off-by: Eduardo Habkost <[email protected]>
Reviewed-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>

diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
index b90df9ada130afe794bf23f507c895ba97a9b7b3..90f192a0745c11cdb621c7bd2d75e4ddfc91c5a4 100644 (file)
--- a/include/sysemu/sysemu.h
+++ b/include/sysemu/sysemu.h
@@ -133,7 +133,14 @@ extern uint8_t qemu_extra_params_fw[2];
 extern QEMUClockType rtc_clock;
 
 #define MAX_NODES 64
 extern QEMUClockType rtc_clock;
 
 #define MAX_NODES 64

+
+/* The following shall be true for all CPUs:
+ *   cpu->cpu_index < max_cpus <= MAX_CPUMASK_BITS
+ *
+ * Note that cpu->get_arch_id() may be larger than MAX_CPUMASK_BITS.
+ */

 #define MAX_CPUMASK_BITS 255
 #define MAX_CPUMASK_BITS 255

+

 extern int nb_numa_nodes;
 extern uint64_t node_mem[MAX_NODES];
 extern unsigned long *node_cpumask[MAX_NODES];
 extern int nb_numa_nodes;
 extern uint64_t node_mem[MAX_NODES];
 extern unsigned long *node_cpumask[MAX_NODES];