From ee18d3b1096f35e712a4af904e7307e2ab71c330 Mon Sep 17 00:00:00 2001
From: pstef <pstef@FreeBSD.org>
Date: Sat, 27 Jun 2020 20:01:56 +0000
Subject: [PATCH] ps(1): don't try to handle non-SMP systems

As reported by kib, sysctl machdep.smp_active doesn't exist and on UP we
return CPU 0 for all threads anyway.

Reported by:	kib
---
 bin/ps/extern.h |  2 +-
 bin/ps/print.c  |  3 ---
 bin/ps/ps.c     | 15 ---------------
 3 files changed, 1 insertion(+), 19 deletions(-)

diff --git a/bin/ps/extern.h b/bin/ps/extern.h
index 2e72632b6542..723d7fcb85dd 100644
--- a/bin/ps/extern.h
+++ b/bin/ps/extern.h
@@ -41,7 +41,7 @@ extern fixpt_t ccpu;
 extern int cflag, eval, fscale, nlistread, rawcpu;
 extern unsigned long mempages;
 extern time_t now;
-extern int showthreads, sumrusage, termwidth, smp;
+extern int showthreads, sumrusage, termwidth;
 extern STAILQ_HEAD(velisthead, varent) varlist;
 
 __BEGIN_DECLS
diff --git a/bin/ps/print.c b/bin/ps/print.c
index d137056aa580..b4458b453cdd 100644
--- a/bin/ps/print.c
+++ b/bin/ps/print.c
@@ -555,9 +555,6 @@ cpunum(KINFO *k, VARENT *ve __unused)
 {
 	char *cpu;
 
-	if (!smp)
-		return (NULL);
-
 	if (k->ki_p->ki_stat == SRUN && k->ki_p->ki_oncpu != NOCPU) {
 		asprintf(&cpu, "%d", k->ki_p->ki_oncpu);
 	} else {
diff --git a/bin/ps/ps.c b/bin/ps/ps.c
index 0bc388c25260..f6d32e5411fe 100644
--- a/bin/ps/ps.c
+++ b/bin/ps/ps.c
@@ -105,7 +105,6 @@ int	 rawcpu;		/* -C */
 int	 sumrusage;		/* -S */
 int	 termwidth;		/* Width of the screen (0 == infinity). */
 int	 showthreads;		/* will threads be shown? */
-int	 smp;			/* multi-processor support */
 
 struct velisthead varlist = STAILQ_HEAD_INITIALIZER(varlist);
 
@@ -158,7 +157,6 @@ static void	 saveuser(KINFO *);
 static void	 scanvars(void);
 static void	 sizevars(void);
 static void	 pidmax_init(void);
-static void	 smp_init(void);
 static void	 usage(void);
 
 static char dfmt[] = "pid,tt,state,time,command";
@@ -228,7 +226,6 @@ main(int argc, char *argv[])
 		argv[1] = kludge_oldps_options(PS_ARGS, argv[1], argv[2]);
 
 	pidmax_init();
-	smp_init();
 
 	all = descendancy = _fmt = nselectors = optfatal = 0;
 	prtheader = showthreads = wflag = xkeep_implied = 0;
@@ -1459,18 +1456,6 @@ pidmax_init(void)
 	}
 }
 
-static void
-smp_init(void)
-{
-	size_t size;
-
-	size = sizeof(smp);
-	if ((sysctlbyname("machdep.smp_active", &smp, &size, NULL, 0) != 0 &&
-		sysctlbyname("kern.smp.active", &smp, &size, NULL, 0) != 0) ||
-		size != sizeof(smp))
-		smp = 0;
-}
-
 static void __dead2
 usage(void)
 {