Re: [PATCH] bpf: convert hashtab lock to raw lock

On Mon, 02 Nov 2015 09:12:29 -0800 "Shi, Yang" yang.shi@linaro.org wrote:

Yes, it is common practice for converting sleepable spin lock to raw spin lock in -rt to avoid scheduling in atomic context bug.

Note, in a lot of cases we don't just convert spin_locks to raw because of atomic context. There's times we need to change the design where the lock is not taken in atomic context (switching preempt_disable() to a local_lock() for example).

But bpf is much like ftrace and kprobes where they can be taken almost anywhere, and the do indeed need to be raw.

-- Steve