bpf: Remove in_atomic() from bpf_link_put(). #5045
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bpf_free_inode() is invoked as a RCU callback. Usually RCU callbacks are invoked within softirq context. By setting rcutree.use_softirq=0 boot option the RCU callbacks will be invoked in a per-CPU kthread with bottom halves disabled which implies a RCU read section. On PREEMPT_RT the context remains fully preemptible. The RCU read section however does not allow schedule() invocation. The latter happens in mutex_lock() performed by bpf_trampoline_unlink_prog() originated from bpf_link_put(). Remove the context checks and use the workqueue unconditionally. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Upstream branch: 6e61c5f |
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=746127 expired. Closing PR. |
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Pull request for series with
subject: bpf: Remove in_atomic() from bpf_link_put().
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=746127