Introduce mp_maxcpus which can be used by libkvm utils to find out

how many CPUs the system was compiled for.
Export the variable via a sysctl node 'kern.smp.maxcpus' as well.

1 files changed, 5 insertions, 0 deletions

diff --git a/sys/kern/subr_smp.c b/sys/kern/subr_smp.c
index b3b81acda63a..019273168085 100644
--- a/sys/kern/subr_smp.c
+++ b/sys/kern/subr_smp.c
@@ -56,6 +56,8 @@ void (*cpustop_restartfunc)(void);
 #endif
 
 int mp_ncpus;
+/* export this for libkvm consumers. */
+int mp_maxcpus = MAXCPU;
 
 volatile int smp_started;
 u_int all_cpus;
@@ -63,6 +65,9 @@ u_int mp_maxid;
 
 SYSCTL_NODE(_kern, OID_AUTO, smp, CTLFLAG_RD, NULL, "Kernel SMP");
 
+SYSCTL_INT(_kern_smp, OID_AUTO, maxcpus, CTLFLAG_RD, &mp_maxcpus, 0,
+    "Max number of CPUs that the system was compiled for.");
+
 int smp_active = 0;	/* are the APs allowed to run? */
 SYSCTL_INT(_kern_smp, OID_AUTO, active, CTLFLAG_RW, &smp_active, 0,
     "Number of Auxillary Processors (APs) that were successfully started");