On Sat, 26 Mar 2022 21:40:40 +0900 Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote: > > BTW, it is already possible to embed kernel parameters > > into the kernel. > > Is this another implementation of CONFIG_CMDLINE? If one changes CONFIG_CMDLINE, does it require a rebuild of vmlinux? > > Yes, it is the bootconfig version of the CONFIG_CMDLINE. > Since some boot-time tracing feature depends on the bootconfig (those can > not be set via kernel cmdline), we need this feature for those features > on non-initrd boot system. Yes, the kernel command line has a fixed size, and with tracing options, we can easily go over it. bootconfig is a way to have an unlimited size and also be able to have a better and more reasonable formatting to express options for things like tracing. -- Steve
