linux-kernel - Re: [PATCH 2/8] CMDLINE: drivers: of: ifdef out cmdline section

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Date:   Tue, 30 Mar 2021 14:49:13 -0500
From:   Rob Herring <robh@...nel.org>
To:     Daniel Walker <danielwa@...co.com>
Cc:     Will Deacon <will@...nel.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Daniel Gimpelevich <daniel@...pelevich.san-francisco.ca.us>,
        Andrew Morton <akpm@...ux-foundation.org>,
        X86 ML <x86@...nel.org>,
        "open list:MIPS" <linux-mips@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Frank Rowand <frowand.list@...il.com>,
        xe-linux-external@...co.com,
        Ruslan Ruslichenko <rruslich@...co.com>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/8] CMDLINE: drivers: of: ifdef out cmdline section

On Tue, Mar 30, 2021 at 12:57 PM Daniel Walker <danielwa@...co.com> wrote:
>
> It looks like there's some seepage of cmdline stuff into
> the generic device tree code. This conflicts with the
> generic cmdline implementation so I remove it in the case
> when that's enabled.
>
> Cc: xe-linux-external@...co.com
> Signed-off-by: Ruslan Ruslichenko <rruslich@...co.com>
> Signed-off-by: Daniel Walker <danielwa@...co.com>
> ---
>  drivers/of/fdt.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index dcc1dd96911a..d8805cd9717a 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -25,6 +25,7 @@
>  #include <linux/serial_core.h>
>  #include <linux/sysfs.h>
>  #include <linux/random.h>
> +#include <linux/cmdline.h>
>
>  #include <asm/setup.h>  /* for COMMAND_LINE_SIZE */
>  #include <asm/page.h>
> @@ -1050,6 +1051,18 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
>
>         /* Retrieve command line */
>         p = of_get_flat_dt_prop(node, "bootargs", &l);
> +
> +#if defined(CONFIG_GENERIC_CMDLINE) && defined(CONFIG_GENERIC_CMDLINE_OF)

Moving in the wrong direction... This code already has too many
#ifdef's. I like Christophe's version as it gets rid of all the code
here.

> +       /*
> +        * The builtin command line will be added here, or it can override
> +        * with the DT bootargs.
> +        */
> +       cmdline_add_builtin(data,
> +                           (l > 0 ? p : NULL), /* This is sanity checking */
> +                           COMMAND_LINE_SIZE);
> +#elif defined(CONFIG_GENERIC_CMDLINE)
> +       strlcpy(data, p, COMMAND_LINE_SIZE);
> +#else
>         if (p != NULL && l > 0)
>                 strlcpy(data, p, min(l, COMMAND_LINE_SIZE));
>
> @@ -1070,6 +1083,7 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
>                 strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
>  #endif
>  #endif /* CONFIG_CMDLINE */
> +#endif /* CONFIG_GENERIC_CMDLINE */
>
>         pr_debug("Command line is: %s\n", (char *)data);
>
> --
> 2.25.1
>