If there is no online CPU within a core which could receive the IPI to
start another VP in that core, a BUG() is triggered. Instead print a
warning and gracefully handle the failure such that the system remains
usable, albeit without the requested secondary CPU.
Signed-off-by: Matt Redfearn <matt.redfearn@xxxxxxxxxx>
---
arch/mips/kernel/smp-cps.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/mips/kernel/smp-cps.c b/arch/mips/kernel/smp-cps.c
index 44339b470ef4..a2544c2394e4 100644
--- a/arch/mips/kernel/smp-cps.c
+++ b/arch/mips/kernel/smp-cps.c
@@ -326,7 +326,11 @@ static void cps_boot_secondary(int cpu, struct task_struct *idle)
if (cpu_online(remote))
break;
}
- BUG_ON(remote >= NR_CPUS);
+ if (remote >= NR_CPUS) {
+ pr_crit("No online CPU in core %u to start CPU%d\n",
+ core, cpu);
+ goto out;
+ }
err = smp_call_function_single(remote, remote_vpe_boot,
NULL, 1);
--
2.7.4
