On Thu, Mar 29, 2018 at 04:05:43PM -0300, Thiago Jung Bauermann wrote:

kexec_file_load() on powerpc doesn't support kdump kernels yet, so it
returns -ENOTSUPP in that case.

I've recently learned that this errno is internal to the kernel and isn't
supposed to be exposed to userspace. Therefore, change to -EOPNOTSUPP which
is defined in an uapi header.

This does indeed make kexec-tools happier. Before the patch, on ppc64le:

  # ~bauermann/src/kexec-tools/build/sbin/kexec -s -p /boot/vmlinuz
  kexec_file_load failed: Unknown error 524

After the patch:

  # ~bauermann/src/kexec-tools/build/sbin/kexec -s -p /boot/vmlinuz
  kexec_file_load failed: Operation not supported

Fixes: a0458284f062 ("powerpc: Add support code for kexec_file_load()")
Reported-by: Dave Young <redacted>
Signed-off-by: Thiago Jung Bauermann <redacted>

Reviewed-by: Simon Horman <horms@verge.net.au>