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Waiman Long
5657c11678
The kernel commit9a5418bc48("sched/core: Use kfree_rcu() in do_set_cpus_allowed()") introduces a bug for kernels built with non-SMP configs. Calling sched_setaffinity() on such a uniprocessor kernel will cause cpumask_copy() to be called with a NULL pointer leading to general protection fault. This is not really a problem in real use cases as there aren't that many uniprocessor kernel configs in use and calling sched_setaffinity() on such a uniprocessor system doesn't make sense. Fix this problem by making sure cpumask_copy() will not be called in such a case. Fixes:9a5418bc48("sched/core: Use kfree_rcu() in do_set_cpus_allowed()") Reported-by: kernel test robot <[email protected]> Signed-off-by: Waiman Long <[email protected]> Signed-off-by: Ingo Molnar <[email protected]> Acked-by: Peter Zijlstra <[email protected]> Link: https://lore.kernel.org/r/[email protected]