linux-kernel - Re: [PATCH 1/4] x86/setup: introduce setup_bultin

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Date:	Sat, 27 Jun 2015 19:54:41 +0600
From:	Alexander Kuleshov <kuleshovmail@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Borislav Petkov <bp@...e.de>,
	David Cohen <david.a.cohen@...ux.intel.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Alexander Kuleshov <kuleshovmail@...il.com>
Subject: Re: [PATCH 1/4] x86/setup: introduce setup_bultin_cmdline

sorry, forgot to add version to this patch, please skip this patch.

2015-06-27 19:46 GMT+06:00 Alexander Kuleshov <kuleshovmail@...il.com>:
> This patch introduces the setup_builtin_cmdline function which appends or
> overrides boot_command_line with the builtin_cmdline if CONFIG_CMDLINE_BOOL
> is set.
>
> Previously this functional was in the setup_arch, but we need to move
> it for getting actual command line as early as possible in the
> arch/x86/kernel/head{32,64}.c for the earlyprintk setup.
>
> Signed-off-by: Alexander Kuleshov <kuleshovmail@...il.com>
> ---
>  arch/x86/include/asm/setup.h |  2 +-
>  arch/x86/kernel/setup.c      | 29 +++++++++++++++++------------
>  2 files changed, 18 insertions(+), 13 deletions(-)
>
> diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
> index 11af24e..70dfa61 100644
> --- a/arch/x86/include/asm/setup.h
> +++ b/arch/x86/include/asm/setup.h
> @@ -124,8 +124,8 @@ asmlinkage void __init i386_start_kernel(void);
>  #else
>  asmlinkage void __init x86_64_start_kernel(char *real_mode);
>  asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
> -
>  #endif /* __i386__ */
> +void __init setup_builtin_cmdline(void);
>  #endif /* _SETUP */
>  #else
>  #define RESERVE_BRK(name,sz)                           \
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index d3b95b8..e528f12 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -847,6 +847,22 @@ dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
>         return 0;
>  }
>
> +void __init setup_builtin_cmdline(void)
> +{
> +#ifdef CONFIG_CMDLINE_BOOL
> +#ifdef CONFIG_CMDLINE_OVERRIDE
> +       strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
> +#else
> +       if (builtin_cmdline[0]) {
> +               /* append boot loader cmdline to builtin */
> +               strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
> +               strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
> +               strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
> +       }
> +#endif
> +#endif
> +}
> +
>  /*
>   * Determine if we were loaded by an EFI loader.  If so, then we have also been
>   * passed the efi memmap, systab, etc., so we should use these data structures
> @@ -975,2 +991,2 @@ void __init setup_arch(char **cmdline_p)
>         bss_resource.start = __pa_symbol(__bss_start);
>         bss_resource.end = __pa_symbol(__bss_stop)-1;
>
> -#ifdef CONFIG_CMDLINE_BOOL
> -#ifdef CONFIG_CMDLINE_OVERRIDE
> -       strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
> -#else
> -       if (builtin_cmdline[0]) {
> -               /* append boot loader cmdline to builtin */
> -               strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
> -               strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
> -               strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
> -       }
> -#endif
> -#endif
> +       setup_builtin_cmdline();
>
>         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
>         *cmdline_p = command_line;
> --
> 2.4.4.410.gc71d752
>
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