On Wed, 20 Apr 2022 18:34:34 +0800 patrick wang <patrick.wang.shcn@xxxxxxxxx> wrote: [ I had a power outage yesterday, just catching up now ] > Sorry for the format. Need get used to gmail. > > These functions are running within stop machine and ftrace modify > code by using stop machine to ensure the safety on some > architectures(e.g. RISC-V). These functions' instructions will be > modified during ftrace modifying code. When instructions are being > modified, they shouldn't be executed typically. Or the executor > may behave unpredictably. Interesting. On x86 when we used stop machine[*] it was not an issue to modify the code that is being executed in stop machine. I'm curious to exactly what the issue is if something does get traced in the stop machine processing. Why does it crash? -- Steve [*] You really should come up with a better way than stop machine, because the stop machine method is really disruptive, can you not use the break point method for updates?
