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Before kernel 2.6.29 credentials were embedded in task_structs, and zfs had cases where one thread would need to refer to the credential of another thread, forcing it to take a hold on the foreign thread's task_struct to ensure it was not freed. Since 2.6.29, the credential has been moved out of the task_struct into a cred_t. In addition, the mainline kernel originally did not export __put_task_struct() but the RHEL5 kernel did, according to zfsonlinux/spl@e811949a57. As of 2.6.39 the mainline kernel exports it. There is no longer zfs code that takes or releases holds on a task_struct, and so there is no longer any reference to __put_task_struct(). This affects the linux 4.11 kernel because the prototype for __put_task_struct() is in a new include file (linux/sched/task.h) and so the config check failed to detect the exported symbol. Removing the unnecessary stub and corresponding config check. This works on kernels since the oldest one currently supported, 2.6.32 as shipped with Centos/RHEL. Reviewed-by: Chunwei Chen <david.chen@osnexus.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #608 |
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