On 2020-12-05, Sergey Senozhatsky <[email protected]> wrote: >> One reason is the use of per-cpu variables. Alternative solution would >> be to store printk_context into task_struct. > > We can keep per-CPU, disable preemption and have counters for > every context (task, soft/hard irq, NMI). Shouldn't be a problem
These contexts are difficult to track correctly for all the preemption models (especially when PREEMPT_RT is included). But I will look into this idea. It would be nice to keep interrupts enabled for that first vsnprintf() in vprintk_store(). John Ogness
