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

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Date:   Fri, 2 Apr 2021 19:32:08 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Daniel Walker <danielwa@...co.com>, Will Deacon <will@...nel.org>,
        ob Herring <robh@...nel.org>,
        Daniel Gimpelevich <daniel@...pelevich.san-francisco.ca.us>,
        Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
        linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>
Cc:     xe-linux-external@...co.com,
        Ruslan Ruslichenko <rruslich@...co.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/8] CMDLINE: drivers: of: ifdef out cmdline section



Le 30/03/2021 à 19:56, Daniel Walker a écrit :
> 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)
> +	/*
> +	 * 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

Ugly.

Linux codying style recommend to limit the use of #ifdefs to headers as much as possible.

Why do we need so many alternatives ? Allthough they are temporary, can we order the changes in 
another way to reduce that ?

>   	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);
>   
>