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rcu/nocb: Add CPU number to CPU-{,de}offload failure messages 

Offline CPUs cannot be offloaded or deoffloaded.  Any attempt to offload
or deoffload an offline CPU causes a message to be printed on the console,
which is good, but this message does not contain the CPU number, which
is bad.  Such a CPU number can be helpful when debugging, as it gives a
clear indication that the CPU in question is in fact offline.  This commit
therefore adds the CPU number to the CPU-{,de}offload failure messages.

Cc: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2022-08-02 17:39:28 -07:00
parent 5334da2af2
commit 638dce227a
1 changed files with 2 additions and 2 deletions
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4
kernel/rcu/tree_nocb.h
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@ -1111,7 +1111,7 @@ int rcu_nocb_cpu_deoffload(int cpu)
if (!ret) if (!ret)
cpumask_clear_cpu(cpu, rcu_nocb_mask); cpumask_clear_cpu(cpu, rcu_nocb_mask);
} else { } else {
pr_info("NOCB: Can't CB-deoffload an offline CPU\n"); pr_info("NOCB: Cannot CB-deoffload offline CPU %d\n", rdp->cpu);
ret = -EINVAL; ret = -EINVAL;
} }
} }
@ -1196,7 +1196,7 @@ int rcu_nocb_cpu_offload(int cpu)
if (!ret) if (!ret)
cpumask_set_cpu(cpu, rcu_nocb_mask); cpumask_set_cpu(cpu, rcu_nocb_mask);
} else { } else {
pr_info("NOCB: Can't CB-offload an offline CPU\n"); pr_info("NOCB: Cannot CB-offload offline CPU %d\n", rdp->cpu);
ret = -EINVAL; ret = -EINVAL;
} }
} }