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[1/2] sysemu.h: Document what MAX_CPUMASK_BITS really limits

Message ID 1395170964-32589-2-git-send-email-ehabkost@redhat.com
State New
Headers show

Commit Message

Eduardo Habkost March 18, 2014, 7:29 p.m. UTC 
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
 include/sysemu/sysemu.h | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
index c01304d..865e5f0 100644
--- 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
+
+/* 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
+
 extern int nb_numa_nodes;
 extern uint64_t node_mem[MAX_NODES];
 extern unsigned long *node_cpumask[MAX_NODES];