[PATCH 6.1 138/162] parisc: Fix crash with nr_cpus=1 option

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6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Helge Deller <deller@xxxxxx>

commit d3b3c637e4eb8d3bbe53e5692aee66add72f9851 upstream.

John David Anglin reported that giving "nr_cpus=1" on the command
line causes a crash, while "maxcpus=1" works.

Reported-by: John David Anglin <dave.anglin@xxxxxxxx>
Signed-off-by: Helge Deller <deller@xxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v5.18+
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 arch/parisc/kernel/smp.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -443,7 +443,9 @@ int __cpu_up(unsigned int cpu, struct ta
 	if (cpu_online(cpu))
 		return 0;
 
-	if (num_online_cpus() < setup_max_cpus && smp_boot_one_cpu(cpu, tidle))
+	if (num_online_cpus() < nr_cpu_ids &&
+		num_online_cpus() < setup_max_cpus &&
+		smp_boot_one_cpu(cpu, tidle))
 		return -EIO;
 
 	return cpu_online(cpu) ? 0 : -EIO;





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