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code to allow range checking on smp_active.

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disabled by default, not sure its ready for prime time.

Submitted by:	 Peter Wemm <peter@spinner.DIALix.COM>
This commit is contained in:
fsmp 1997-05-03 18:24:25 +00:00
parent ff93f511b8
commit 31da781226
1 changed files with 44 additions and 2 deletions
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46
sys/kern/init_smp.c
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@ -22,7 +22,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: init_smp.c,v 1.2 1997/04/28 00:24:00 fsmp Exp $
* $Id: init_smp.c,v 1.3 1997/05/01 14:18:05 peter Exp $
*/
#include "opt_smp.h"
@ -55,9 +55,51 @@
#include <sys/user.h>
int smp_active = 0; /* is the secondary allowed to run? */
#define NEW_STYLE_NOT
int smp_active = 0; /* are the APs allowed to run? */
#if defined(NEW_STYLE)
/* a shadow copy for diddling */
static int xsmp_active = 0;
static int
sysctl_xmp SYSCTL_HANDLER_ARGS
{
int error;
/* load the shadow with the current value */
xsmp_active = smp_active;
/* update the shadow */
error = sysctl_handle_int( oidp, oidp->oid_arg1, oidp->oid_arg2, req );
if (!error) {
/* check the shadow for a legal range */
if ((xsmp_active < 1) || (xsmp_active > mp_ncpus)) {
xsmp_active = smp_active; /* bad, back to old */
error = EOPNOTSUPP;
}
else {
smp_active = xsmp_active; /* good, update */
}
}
else {
xsmp_active = smp_active; /* ??? */
}
return error;
}
SYSCTL_PROC(_kern, OID_AUTO, smp_active, CTLTYPE_INT | CTLFLAG_RW,
&xsmp_active, 0, &sysctl_xmp, "I", "");
#else /* NEW_STYLE_NOT */
SYSCTL_INT(_kern, OID_AUTO, smp_active, CTLFLAG_RW, &smp_active, 0, "");
#endif /* NEW_STYLE */
int smp_cpus = 0; /* how many cpu's running */
SYSCTL_INT(_kern, OID_AUTO, smp_cpus, CTLFLAG_RD, &smp_cpus, 0, "");