On Wed, 26 Jun 2019 16:44:45 +0200 (CEST) Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote: > > > > It should be enough to fix the original problem because > > x86 is the only architecture that calls set_all_modules_text_rw() > > in ftrace path and supports livepatching at the same time. > > Looks correct, but I've paged out all the gory details vs. lock ordering in > that area. I don't believe ftrace_lock and text_mutex had an order before Petr's initial patches. Reversing them shouldn't be an issue here. They were basically both "leaf" mutexes (not grabbing any mutexes when they are held). -- Steve
