svn commit: r299383 - head/sys/arm/arm

[Emmanuel Vadot]

Author: manu
Date: Tue May 10 19:11:25 2016
New Revision: 299383
URL: https://svnweb.freebsd.org/changeset/base/299383

Log:
  When PLATFORM_SMP is enabled, check if tunable hw.ncpu is set and valid
  (>= 1 and <= real ncores) and set mp_ncpus to it.
  
  Approved by:	andrew (mentor)
  Differential Revision:	https://reviews.freebsd.org/D6151

Modified:
  head/sys/arm/arm/platform.c

Modified: head/sys/arm/arm/platform.c
==============================================================================
--- head/sys/arm/arm/platform.c	Tue May 10 18:28:38 2016	(r299382)
+++ head/sys/arm/arm/platform.c	Tue May 10 19:11:25 2016	(r299383)
@@ -209,8 +209,16 @@ platform_delay(int usec, void *arg __unu
 void
 platform_mp_setmaxid(void)
 {
+	int ncpu;
 
 	PLATFORM_MP_SETMAXID(plat_obj);
+
+	if (TUNABLE_INT_FETCH("hw.ncpu", &ncpu)) {
+		if (ncpu >= 1 && ncpu <= mp_ncpus) {
+			mp_ncpus = ncpu;
+			mp_maxid = ncpu - 1;
+		}
+	}
 }
 
 void