On 2023-10-16 12:56:24 [-0400], Steven Rostedt wrote: > On Fri, 13 Oct 2023 13:17:52 -0400 > Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > > Because in RT, spin_lock()s are actually mutexes. > > In RT, interrupt handlers do not even run with interrupts disabled (they > run as threads), so the assumption that they run with interrupts disabled > on RT is incorrect. One hack would simply be: > > if (!IS_ENABLED(CONFIG_PREEMPT_RT)) > local_irq_disable(); > usb_hcd_irq(0, hcd); > if (!IS_ENABLED(CONFIG_PREEMPT_RT)) > local_irq_enable(); > > But that's rather ugly. We use to have that as a wrapper of just: > > local_irq_disable_nort(); > > but I don't know if we removed that or not. > > Sebastian? Got removed once it had zero users. It was hated because it was used usually used as a quick solution to hide problems underneath. > -- Steve Sebastian
