linux-kernel - Re: [PATCH 2/2 v2] Only print "Decompressing Linux" etc when 'debug' is passed.

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Date:	Sat, 24 May 2008 21:54:01 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Kristian Høgsberg" <krh@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2 v2] Only print "Decompressing Linux" etc when 'debug' is passed.

On Sat, May 24, 2008 at 8:47 PM, Kristian Høgsberg <krh@...hat.com> wrote:
> Signed-off-by: Kristian Høgsberg <krh@...hat.com>
> ---
>
> Updated to use the standard 'debug' parameter instead of 'noisy'.
>
>  arch/x86/boot/compressed/misc.c |   30 +++++++++++++++++++++++++++---
>  1 files changed, 27 insertions(+), 3 deletions(-)
>
> diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
> index 0d03579..017df26 100644
> --- a/arch/x86/boot/compressed/misc.c
> +++ b/arch/x86/boot/compressed/misc.c
> @@ -190,6 +190,7 @@ static void gzip_release(void **);
>  */
>  static struct boot_params *real_mode;          /* Pointer to real-mode data */
>  static struct screen_info *rm_screen_info;     /* Pointer to real-mode data */
> +static int debug;
>
>  extern unsigned char input_data[];
>  extern int input_len;
> @@ -391,7 +392,8 @@ static void parse_elf(void *output)
>                return;
>        }
>
> -       putstr("Parsing ELF... ");
> +       if (debug)
> +               putstr("Parsing ELF... ");
>
>        phdrs = malloc(sizeof(*phdrs) * ehdr.e_phnum);
>        if (!phdrs)
> @@ -419,11 +421,27 @@ static void parse_elf(void *output)
>        }
>  }
>
> +static const char *strnstr(const char *string, int len, const char *s)
> +{
> +       int i, j;
> +
> +       for (i = 0; i < len; i++) {
> +               for (j = 0; i + j < len && s[j]; j++)
> +                       if (string[i + j] != s[j])
> +                               break;
> +               if (s[j] == '\0')
> +                       return string + i;
> +       }
> +
> +       return NULL;
> +}
>  asmlinkage void decompress_kernel(void *rmode, memptr heap,
>                                  unsigned char *input_data,
>                                  unsigned long input_len,
>                                  unsigned char *output)
>  {
> +       char *cmdline;
> +
>        real_mode = rmode;
>
>        if (rm_screen_info->orig_video_mode == 7) {
> @@ -437,6 +455,10 @@ asmlinkage void decompress_kernel(void *rmode, memptr heap,
>        lines = rm_screen_info->orig_video_lines;
>        cols = rm_screen_info->orig_video_cols;
>
> +       cmdline = (char *) real_mode->hdr.cmd_line_ptr;
> +       if (strnstr(cmdline, real_mode->hdr.cmdline_size, "debug"))
> +               debug = 1;
> +
>        window = output;                /* Output buffer (Normally at 1M) */
>        free_mem_ptr     = heap;        /* Heap */
>        free_mem_end_ptr = heap + BOOT_HEAP_SIZE;
> @@ -461,9 +483,11 @@ asmlinkage void decompress_kernel(void *rmode, memptr heap,
>  #endif
>
>        makecrc();
> -       putstr("\nDecompressing Linux... ");
> +       if (debug)
> +               putstr("\nDecompressing Linux... ");
>        gunzip();
>        parse_elf(output);
> -       putstr("done.\nBooting the kernel.\n");
> +       if (debug)
> +               putstr("done.\nBooting the kernel.\n");
>        return;
>  }
> --

does that printout hurt anything?

YH
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