Commit afdb4a5b1d34 for kernel

commit afdb4a5b1d340e4afffc65daa21cc71890d7d589
Author: Helge Deller <deller@gmx.de>
Date:   Sat Dec 4 21:21:46 2021 +0100

    parisc: Mark cr16 CPU clocksource unstable on all SMP machines

    In commit c8c3735997a3 ("parisc: Enhance detection of synchronous cr16
    clocksources") I assumed that CPUs on the same physical core are syncronous.
    While booting up the kernel on two different C8000 machines, one with a
    dual-core PA8800 and one with a dual-core PA8900 CPU, this turned out to be
    wrong. The symptom was that I saw a jump in the internal clocks printed to the
    syslog and strange overall behaviour.  On machines which have 4 cores (2
    dual-cores) the problem isn't visible, because the current logic already marked
    the cr16 clocksource unstable in this case.

    This patch now marks the cr16 interval timers unstable if we have more than one
    CPU in the system, and it fixes this issue.

    Fixes: c8c3735997a3 ("parisc: Enhance detection of synchronous cr16 clocksources")
    Signed-off-by: Helge Deller <deller@gmx.de>
    Cc: <stable@vger.kernel.org> # v5.15+

diff --git a/arch/parisc/kernel/time.c b/arch/parisc/kernel/time.c
index 9fb1e794831b..061119a56fbe 100644
--- a/arch/parisc/kernel/time.c
+++ b/arch/parisc/kernel/time.c
@@ -249,30 +249,16 @@ void __init time_init(void)
 static int __init init_cr16_clocksource(void)
 {
 	/*
-	 * The cr16 interval timers are not syncronized across CPUs on
-	 * different sockets, so mark them unstable and lower rating on
-	 * multi-socket SMP systems.
+	 * The cr16 interval timers are not syncronized across CPUs, even if
+	 * they share the same socket.
 	 */
 	if (num_online_cpus() > 1 && !running_on_qemu) {
-		int cpu;
-		unsigned long cpu0_loc;
-		cpu0_loc = per_cpu(cpu_data, 0).cpu_loc;
-
-		for_each_online_cpu(cpu) {
-			if (cpu == 0)
-				continue;
-			if ((cpu0_loc != 0) &&
-			    (cpu0_loc == per_cpu(cpu_data, cpu).cpu_loc))
-				continue;
-
-			/* mark sched_clock unstable */
-			clear_sched_clock_stable();
-
-			clocksource_cr16.name = "cr16_unstable";
-			clocksource_cr16.flags = CLOCK_SOURCE_UNSTABLE;
-			clocksource_cr16.rating = 0;
-			break;
-		}
+		/* mark sched_clock unstable */
+		clear_sched_clock_stable();
+
+		clocksource_cr16.name = "cr16_unstable";
+		clocksource_cr16.flags = CLOCK_SOURCE_UNSTABLE;
+		clocksource_cr16.rating = 0;
 	}

 	/* register at clocksource framework */