On Thu, 28 May 2015, Daniel Wagner wrote: > __do_softirq() uses __local_bh_disable_ip(SOFTIRQ_OFFSET) to disable > SOFTIRQs and signaling that softirqs are served. > > When done, __do_softirq() calls __local_bh_enable(SOFTIRQ_OFFSET) > to enable them again. The reason it does not call > __local_bh_enable_ip(SOFTIRQ_OFFSET) is because __local_bh_enable_ip() > would process still-pending softirqs. > > Now, we face the same problem as in __local_bh_disable_ip() > with the preempt tracer hooking into preempt_count_sub(). This > will case lockdep warning, when for example the kernel is configured > to run all IRQs as threads and preemptoff tracer is activated:
.... > Signed-off-by: Daniel Wagner <daniel.wag...@bmw-carit.de> Acked-by: Thomas Gleixner <t...@linutronix.de> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
