Re: [PATCH v3 26/34] s390/ftrace: Unpoison ftrace_regs in kprobe_ftrace_handler()

On Thu, Dec 14, 2023 at 12:24:46AM +0100, Ilya Leoshkevich wrote: > s390 uses assembly code to initialize ftrace_regs and call > kprobe_ftrace_handler(). Therefore, from the KMSAN's point of view, > ftrace_regs is poisoned on kprobe_ftrace_handler() entry. This causes > KMSAN warnings when running

[PATCH v3 26/34] s390/ftrace: Unpoison ftrace_regs in kprobe_ftrace_handler()

s390 uses assembly code to initialize ftrace_regs and call kprobe_ftrace_handler(). Therefore, from the KMSAN's point of view, ftrace_regs is poisoned on kprobe_ftrace_handler() entry. This causes KMSAN warnings when running the ftrace testsuite. Fix by trusting the assembly code and always