target/linux/generic/patches-3.2/332-mips-kexec-init-the-arguments-for-the-new-kernel-image.patch

   1 From 49d07a29653b1f2c6ae273b3d8fe93d981f43004 Mon Sep 17 00:00:00 2001
   2 From: Wu Zhangjin <wuzhangjin@gmail.com>
   3 Date: Wed, 12 Jan 2011 20:59:32 +0000
   4 Subject: MIPS: Kexec: Init the arguments for the new kernel image
   5
   6 Whenever the kexec-tools pass the command lines to the new kernel image,
   7 init the arguments as the ones for the 1st kernel image. This fixed the
   8 booting failure of Kexec on YeeLoong.
   9
  10 Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
  11 ---
  12 --- a/arch/mips/kernel/machine_kexec.c
  13 +++ b/arch/mips/kernel/machine_kexec.c
  14 @@ -10,6 +10,7 @@
  15  #include <linux/mm.h>
  16  #include <linux/delay.h>
  17
  18 +#include <asm/bootinfo.h>
  19  #include <asm/cacheflush.h>
  20  #include <asm/page.h>
  21
  22 @@ -21,9 +22,30 @@ void (*relocated_kexec_smp_wait) (void *
  23  atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
  24  #endif
  25
  26 +static void machine_kexec_init_args(void)
  27 +{
  28 +       kexec_args[0] = fw_arg0;
  29 +       kexec_args[1] = fw_arg1;
  30 +       kexec_args[2] = fw_arg2;
  31 +       kexec_args[3] = fw_arg3;
  32 +
  33 +       pr_info("kexec_args[0] (argc): %lu\n", kexec_args[0]);
  34 +       pr_info("kexec_args[1] (argv): %p\n", (void *)kexec_args[1]);
  35 +       pr_info("kexec_args[2] (env ): %p\n", (void *)kexec_args[2]);
  36 +       pr_info("kexec_args[3] (desc): %p\n", (void *)kexec_args[3]);
  37 +}
  38 +
  39  int
  40  machine_kexec_prepare(struct kimage *kimage)
  41  {
  42 +       /*
  43 +        * Whenever arguments passed from kexec-tools, Init the arguments as
  44 +        * the original ones to avoid booting failure.
  45 +        *
  46 +        * This can be overrided by _machine_kexec_prepare().
  47 +        */
  48 +       machine_kexec_init_args();
  49 +
  50         if (_machine_kexec_prepare)
  51                 return _machine_kexec_prepare(kimage);
  52         return 0;