linux-kernel - Re: [PATCH v3 1/3] x86/setup: introduce setup_bultin

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Date:	Tue, 12 May 2015 13:50:15 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Alexander Kuleshov <kuleshovmail@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Borislav Petkov <bp@...e.de>,
	Mark Rustad <mark.d.rustad@...el.com>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH v3 1/3] x86/setup: introduce setup_bultin_cmdline

On Tue, 2015-05-12 at 14:09 +0600, Alexander Kuleshov wrote:
> 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.
> 

Couple of comments.

First of all,6 is a property of each patch in the series, since series
means the logically linked pieces of changes. So, Why v3 is here?

> 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 |  1 +
>  arch/x86/kernel/setup.c      | 29 ++++++++++++++++-------------
>  2 files changed, 17 insertions(+), 13 deletions(-)
> 
> diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
> index f69e06b..59efd0d 100644
> --- a/arch/x86/include/asm/setup.h
> +++ b/arch/x86/include/asm/setup.h
> @@ -119,6 +119,7 @@ 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 d74ac33..0aeee0a 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -845,6 +845,22 @@ 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
> @@ -973,19 +989,6 @@ 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
> -

This one breaks kernel to work. You have to call setup_builtin_cmdline()
here.

>  	strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
>  	*cmdline_p = command_line;
> 
> --
> 2.4.0


-- 
Andy Shevchenko <andriy.shevchenko@...el.com>
Intel Finland Oy

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