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From: Rob Herring <robh@kernel.org>
To: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Will Deacon <will@kernel.org>, Daniel Walker <danielwa@cisco.com>,
	Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>,
	"open list:GENERIC INCLUDE/ASM HEADER FILES" 
	<linux-arch@vger.kernel.org>,
	devicetree@vger.kernel.org,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	microblaze <monstr@monstr.eu>,
	"open list:MIPS" <linux-mips@vger.kernel.org>,
	nios2 <ley.foon.tan@intel.com>,
	Openrisc <openrisc@lists.librecores.org>,
	linux-hexagon@vger.kernel.org,
	linux-riscv <linux-riscv@lists.infradead.org>,
	X86 ML <x86@kernel.org>,
	linux-xtensa@linux-xtensa.org,
	SH-Linux <linux-sh@vger.kernel.org>,
	sparclinux <sparclinux@vger.kernel.org>
Subject: Re: [PATCH v3 01/17] cmdline: Add generic function to build command line.
Date: Fri, 26 Mar 2021 09:42:35 -0600
Message-ID: <CAL_JsqKr3xekKSo3DtQvOOw_VoGC=FUTagZGY5g=CGGGdUZSMQ@mail.gmail.com> (raw)
In-Reply-To: <878228ad88df38f8914c7aa25dede3ed05c50f48.1616765869.git.christophe.leroy@csgroup.eu>

On Fri, Mar 26, 2021 at 7:44 AM Christophe Leroy
<christophe.leroy@csgroup.eu> wrote:
>
> This code provides architectures with a way to build command line
> based on what is built in the kernel and what is handed over by the
> bootloader, based on selected compile-time options.

Note that I have this patch pending:

https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20210316193820.3137-1-alex@ghiti.fr/

It's going to need to be adapted for this. I've held off applying to
see if this gets settled.

>
> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
> ---
> v3:
> - Addressed comments from Will
> - Added capability to have src == dst
> ---
>  include/linux/cmdline.h | 57 +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 57 insertions(+)
>  create mode 100644 include/linux/cmdline.h
>
> diff --git a/include/linux/cmdline.h b/include/linux/cmdline.h
> new file mode 100644
> index 000000000000..dea87edd41be
> --- /dev/null
> +++ b/include/linux/cmdline.h
> @@ -0,0 +1,57 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _LINUX_CMDLINE_H
> +#define _LINUX_CMDLINE_H
> +
> +#include <linux/string.h>
> +
> +/* Allow architectures to override strlcat, powerpc can't use strings so early */
> +#ifndef cmdline_strlcat
> +#define cmdline_strlcat strlcat
> +#endif
> +
> +/*
> + * This function will append or prepend a builtin command line to the command
> + * line provided by the bootloader. Kconfig options can be used to alter
> + * the behavior of this builtin command line.
> + * @dst: The destination of the final appended/prepended string.
> + * @src: The starting string or NULL if there isn't one.
> + * @len: the length of dest buffer.
> + */
> +static __always_inline void __cmdline_build(char *dst, const char *src, size_t len)
> +{
> +       if (!len || src == dst)
> +               return;
> +
> +       if (IS_ENABLED(CONFIG_CMDLINE_FORCE) || !src) {
> +               dst[0] = 0;
> +               cmdline_strlcat(dst, CONFIG_CMDLINE, len);
> +               return;
> +       }
> +
> +       if (dst != src)
> +               dst[0] = 0;
> +
> +       if (IS_ENABLED(CONFIG_CMDLINE_PREPEND))
> +               cmdline_strlcat(dst, CONFIG_CMDLINE " ", len);
> +
> +       cmdline_strlcat(dst, src, len);
> +
> +       if (IS_ENABLED(CONFIG_CMDLINE_EXTEND))

Should be APPEND.

> +               cmdline_strlcat(dst, " " CONFIG_CMDLINE, len);
> +}
> +
> +#define cmdline_build(dst, src, len) do {                              \

Perhaps a comment why we need this to be a define.

> +       char *__c_dst = (dst);                                          \
> +       const char *__c_src = (src);                                    \
> +                                                                       \
> +       if (__c_src == __c_dst) {                                       \
> +               static char __c_tmp[COMMAND_LINE_SIZE] __initdata = ""; \
> +                                                                       \
> +               cmdline_strlcat(__c_tmp, __c_src, COMMAND_LINE_SIZE);   \
> +               __cmdline_build(__c_dst, __c_tmp, (len));               \
> +       } else {                                                        \
> +               __cmdline_build(__c_dst, __c_src, (len));               \
> +       }                                                               \
> +} while (0)
> +
> +#endif /* _LINUX_CMDLINE_H */
> --
> 2.25.0
>

  reply index

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-26 13:44 [PATCH v3 00/17] Implement GENERIC_CMDLINE Christophe Leroy
2021-03-26 13:44 ` [PATCH v3 01/17] cmdline: Add generic function to build command line Christophe Leroy
2021-03-26 15:42   ` Rob Herring [this message]
2021-03-26 15:55     ` Christophe Leroy
2021-04-02 15:23     ` Christophe Leroy
2021-03-30 17:27   ` Daniel Walker
2021-03-30 18:07     ` H. Nikolaus Schaller
2021-03-30 18:23       ` Daniel Walker
2021-04-02 15:33     ` Christophe Leroy
2021-03-26 13:44 ` [PATCH v3 02/17] drivers: of: use cmdline building function Christophe Leroy
2021-03-26 13:44 ` [PATCH v3 03/17] cmdline: Gives architectures opportunity to use generically defined boot cmdline manipulation Christophe Leroy
2021-03-26 13:44 ` [PATCH v3 04/17] powerpc: Convert to GENERIC_CMDLINE Christophe Leroy
2021-03-26 13:44 ` [PATCH v3 05/17] arm: " Christophe Leroy
2021-03-26 15:47   ` Rob Herring
2021-03-26 15:49     ` Christophe Leroy
2021-03-26 18:22       ` Rob Herring
2021-04-02 15:19     ` Christophe Leroy
2021-04-02 15:24     ` Christophe Leroy
2021-03-26 13:44 ` [PATCH v3 06/17] arm64: " Christophe Leroy
2021-03-26 13:44 ` [PATCH v3 07/17] hexagon: " Christophe Leroy
2021-03-26 13:44 ` [PATCH v3 08/17] microblaze: " Christophe Leroy
2021-03-26 13:44 ` [PATCH v3 09/17] nios2: " Christophe Leroy
2021-03-29  1:35   ` Tan, Ley Foon
2021-04-02 15:33     ` Christophe Leroy
2021-03-26 13:44 ` [PATCH v3 10/17] openrisc: " Christophe Leroy
2021-03-26 13:44 ` [PATCH v3 11/17] riscv: " Christophe Leroy
2021-03-26 14:08   ` Andreas Schwab
2021-03-26 14:20     ` Christophe Leroy
2021-03-26 15:26       ` Rob Herring
2021-03-30  0:52         ` Nick Kossifidis
2021-04-02 15:21         ` Christophe Leroy
2021-03-26 13:44 ` [PATCH v3 12/17] sh: " Christophe Leroy
2021-04-02 15:36   ` Christophe Leroy
2021-03-26 13:45 ` [PATCH v3 13/17] sparc: " Christophe Leroy
2021-03-26 13:45 ` [PATCH v3 14/17] xtensa: " Christophe Leroy
2021-03-26 13:45 ` [PATCH v3 15/17] x86: " Christophe Leroy
2021-03-26 13:45 ` [PATCH v3 16/17] mips: " Christophe Leroy
2021-03-26 13:45 ` [PATCH v3 17/17] cmdline: Remove CONFIG_CMDLINE_EXTEND Christophe Leroy
2021-03-26 15:04 ` [PATCH v3 00/17] Implement GENERIC_CMDLINE Rob Herring
2021-04-02 15:20   ` Christophe Leroy

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