Hello,
On Sun, Nov 26, 2023 at 11:19:56PM -0500, Waiman Long wrote:
> +bool cpuset_cpu_is_isolated(int cpu)
> +{
> + unsigned int seq;
> + bool ret;
> +
> + do {
> + seq = read_seqcount_begin(&isolcpus_seq);
> + ret = cpumask_test_cpu(cpu, isolated_cpus);
> + } while (read_seqcount_retry(&isolcpus_seq, seq));
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(cpuset_cpu_is_isolated);
We're testing a bit in a bitmask. I don't think we need to worry about value
integrity from RMW updates being broken up. ie. We can just test the bit
without seqlock and drop the first patch?
Thanks.
--
tejun
