kexec, x86: fix kexec when boot_params.hardware_subarch != 0

kexec needs to keep the subarch setting the same as the running kernel
in the boot parameters, or the kernel will die in early setup.  I ran
into this with X86_SUBARCH_MRST, but it should apply to CE4100 and any
future subarch that uses non-default early setup code.

This patch requires debugfs mounted at /sys/kernel/debug, as that's
the only way I know of to get at the running kernels boot_params.
Without debugfs mounted it falls back to the current behavior of
assuming subarch 0.

Signed-off-by: Chris Leech <christopher.leech@linux.intel.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

0 files changed, 0 insertions, 0 deletions