Re: [PATCH v3 11/17] riscv: Convert to GENERIC_CMDLINE

[Nick Kossifidis]

Στις 2021-03-26 17:26, Rob Herring έγραψε:
> On Fri, Mar 26, 2021 at 8:20 AM Christophe Leroy
> <christophe.leroy@xxxxxxxxxx> wrote:
> > Le 26/03/2021 à 15:08, Andreas Schwab a écrit :
> > > On Mär 26 2021, Christophe Leroy wrote:
> > >
> > >> diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
> > >> index f8f15332caa2..e7c91ee478d1 100644
> > >> --- a/arch/riscv/kernel/setup.c
> > >> +++ b/arch/riscv/kernel/setup.c
> > >> @@ -20,6 +20,7 @@
> > >>   #include <linux/swiotlb.h>
> > >>   #include <linux/smp.h>
> > >>   #include <linux/efi.h>
> > >> +#include <linux/cmdline.h>
> > >>
> > >>   #include <asm/cpu_ops.h>
> > >>   #include <asm/early_ioremap.h>
> > >> @@ -228,10 +229,8 @@ static void __init parse_dtb(void)
> > >>      }
> > >>
> > >>      pr_err("No DTB passed to the kernel\n");
> > >> -#ifdef CONFIG_CMDLINE_FORCE
> > >> -    strlcpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
> > >> +    cmdline_build(boot_command_line, NULL, COMMAND_LINE_SIZE);
> > >>      pr_info("Forcing kernel command line to: %s\n", boot_command_line);
> > >
> > > Shouldn't that message become conditional in some way?
> > >
> >
> > You are right, I did something similar on ARM but looks like I missed 
> > it on RISCV.
>
> How is this hunk even useful? Under what conditions can you boot
> without a DTB? Even with a built-in DTB, the DT cmdline handling would
> be called.
>
> Rob

cced Paul who introduced this:
https://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git/commit/arch/riscv/kernel/setup.c?id=8fd6e05c7463b635e51ec7df0a1858c1b5a6e350