linux-kernel - Re: [PATCH 2/5] x86/boot: Move get_cmd_line_ptr() and COMMAND_LINE

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Date:   Thu, 8 Oct 2020 11:11:32 +0200
From:   Joerg Roedel <jroedel@...e.de>
To:     Arvind Sankar <nivedita@...m.mit.edu>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] x86/boot: Move get_cmd_line_ptr() and
 COMMAND_LINE_SIZE into misc.h

On Wed, Oct 07, 2020 at 03:53:48PM -0400, Arvind Sankar wrote:
> Move get_cmd_line_ptr() and COMMAND_LINE_SIZE into misc.h for easier
> use from multiple files.
> 
> Signed-off-by: Arvind Sankar <nivedita@...m.mit.edu>
> ---
>  arch/x86/boot/compressed/cmdline.c |  8 --------
>  arch/x86/boot/compressed/kaslr.c   |  6 ------
>  arch/x86/boot/compressed/misc.h    | 13 +++++++++++++
>  3 files changed, 13 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/x86/boot/compressed/cmdline.c b/arch/x86/boot/compressed/cmdline.c
> index f1add5d85da9..d0e1d386749d 100644
> --- a/arch/x86/boot/compressed/cmdline.c
> +++ b/arch/x86/boot/compressed/cmdline.c
> @@ -12,14 +12,6 @@ static inline char rdfs8(addr_t addr)
>  	return *((char *)(fs + addr));
>  }
>  #include "../cmdline.c"
> -unsigned long get_cmd_line_ptr(void)
> -{
> -	unsigned long cmd_line_ptr = boot_params->hdr.cmd_line_ptr;
> -
> -	cmd_line_ptr |= (u64)boot_params->ext_cmd_line_ptr << 32;
> -
> -	return cmd_line_ptr;
> -}
>  int cmdline_find_option(const char *option, char *buffer, int bufsize)
>  {
>  	return __cmdline_find_option(get_cmd_line_ptr(), option, buffer, bufsize);
> diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
> index b59547ce5b19..f3286a3bef36 100644
> --- a/arch/x86/boot/compressed/kaslr.c
> +++ b/arch/x86/boot/compressed/kaslr.c
> @@ -36,12 +36,6 @@
>  #define STATIC
>  #include <linux/decompress/mm.h>
>  
> -#define _SETUP
> -#include <asm/setup.h>	/* For COMMAND_LINE_SIZE */
> -#undef _SETUP
> -
> -extern unsigned long get_cmd_line_ptr(void);
> -
>  /* Simplified build-specific string for starting entropy. */
>  static const char build_str[] = UTS_RELEASE " (" LINUX_COMPILE_BY "@"
>  		LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") " UTS_VERSION;
> diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h
> index 6d31f1b4c4d1..95aacc361f78 100644
> --- a/arch/x86/boot/compressed/misc.h
> +++ b/arch/x86/boot/compressed/misc.h
> @@ -25,6 +25,10 @@
>  #include <asm/bootparam.h>
>  #include <asm/desc_defs.h>
>  
> +#define _SETUP
> +#include <asm/setup.h>	/* For COMMAND_LINE_SIZE */
> +#undef _SETUP
> +
>  #define BOOT_CTYPE_H
>  #include <linux/acpi.h>
>  
> @@ -70,6 +74,15 @@ static inline void debug_puthex(unsigned long value)
>  #endif
>  
>  /* cmdline.c */
> +static inline
> +unsigned long get_cmd_line_ptr(void)
> +{
> +	unsigned long cmd_line_ptr = boot_params->hdr.cmd_line_ptr;
> +
> +	cmd_line_ptr |= (u64)boot_params->ext_cmd_line_ptr << 32;
> +
> +	return cmd_line_ptr;
> +}
>  int cmdline_find_option(const char *option, char *buffer, int bufsize);
>  int cmdline_find_option_bool(const char *option);

Reviewed-by: Joerg Roedel <jroedel@...e.de>