Re: [RFC PATCH v7 05/10] trace: make the stackmap capacity settable on the kernel command line

From: Pengfei Li <redacted>

Does passing this NULL pointer directly to kstrtoul() cause an immediate NULL
pointer dereference and kernel panic, since kstrtoul() does not check for a
NULL pointer before dereferencing it?

Yes. Booting with a bare "ftrace_stackmap.bits" panics. Will fix in v8:

	if (!str)
		return -EINVAL;

Thanks.

Pengfei