On Tue, 20 Oct 2020 19:18:01 +0800 Guo Ren <guoren@xxxxxxxxxx> wrote: > > What platform are you testing ? We are seeing a crash while enabling > > any of the tracers multiple times > > on Qemu/HiFive Unleashed. > I use qemu for testing. I've changed dynamic ftrace mechanism from > mcount to -fpatchable-entry. > > The problem is made by the lockdep checking of text_mutex. If you are switching to "patchable-entry" you shouldn't need to use stop_machine for the updates. No? -- Steve
