target/linux/brcm2708/patches-4.4/0050-fdt-Add-support-for-the-CONFIG_CMDLINE_EXTEND-option.patch

   1 From e88c206c101194b8513860c135ee77366d7456eb Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Fri, 5 Dec 2014 17:26:26 +0000
   4 Subject: [PATCH 050/304] fdt: Add support for the CONFIG_CMDLINE_EXTEND option
   5
   6 ---
   7  drivers/of/fdt.c | 29 ++++++++++++++++++++++++-----
   8  1 file changed, 24 insertions(+), 5 deletions(-)
   9
  10 --- a/drivers/of/fdt.c
  11 +++ b/drivers/of/fdt.c
  12 @@ -954,19 +954,38 @@ int __init early_init_dt_scan_chosen(uns
  13
  14         /* Retrieve command line */
  15         p = of_get_flat_dt_prop(node, "bootargs", &l);
  16 -       if (p != NULL && l > 0)
  17 -               strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
  18
  19         /*
  20          * CONFIG_CMDLINE is meant to be a default in case nothing else
  21          * managed to set the command line, unless CONFIG_CMDLINE_FORCE
  22          * is set in which case we override whatever was found earlier.
  23 +        *
  24 +        * However, it can be useful to be able to treat the default as
  25 +        * a starting point to be extended using CONFIG_CMDLINE_EXTEND.
  26          */
  27 +       ((char *)data)[0] = '\0';
  28 +
  29  #ifdef CONFIG_CMDLINE
  30 -#ifndef CONFIG_CMDLINE_FORCE
  31 -       if (!((char *)data)[0])
  32 +       strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
  33 +
  34 +       if (p != NULL && l > 0) {
  35 +#if defined(CONFIG_CMDLINE_EXTEND)
  36 +               int len = strlen(data);
  37 +               if (len > 0) {
  38 +                       strlcat(data, " ", COMMAND_LINE_SIZE);
  39 +                       len++;
  40 +               }
  41 +               strlcpy((char *)data + len, p, min((int)l, COMMAND_LINE_SIZE - len));
  42 +#elif defined(CONFIG_CMDLINE_FORCE)
  43 +               pr_warning("Ignoring bootargs property (using the default kernel command line)\n");
  44 +#else
  45 +               /* Neither extend nor force - just override */
  46 +               strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
  47  #endif
  48 -               strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
  49 +       }
  50 +#else /* CONFIG_CMDLINE */
  51 +       if (p != NULL && l > 0)
  52 +               strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
  53  #endif /* CONFIG_CMDLINE */
  54
  55         pr_debug("Command line is: %s\n", (char*)data);