[PATCH 0/2] kernel probe function fixes

[Dave Young]

During my testing for arm zImage, in 2nd kernel the atags pointer and the
machine_id are not valid, I did a lot of debugging in kernel, finally I found
this is caused by a kexec tools bug instead.

It is a regression since bf06cf2095. It changes uImage probe return values as
below:
 *  0		- valid uImage type
 * -1           - If the image is corrupted.
 *  1           - If the image is not a uImage.

Because uImage will be probed before zImage, but the uImage probe return 1 for
a zImage thus kexec will mistakenly think it is ok to use as uImage.

IMHO, return -1 in case it's not an uImage is better instead of 1 like before
It's not really necessary to introduce a new return value. It might be better
for a new patch to return either 0 or -1 for uImage probe.

But I did not fix the uImage return value yet. In this patchset I did below:
 - ppc64 zImage: return 0 instead of 1 in case of success
 - strictly checking if probe return 0 in kexec.c

Tested arm zImage with use_atags only.

Dave Young (2):
  zImage_ppc64_probe: return 0 instead of 1 in case of success
  kernel image probe function return value checking fix

 kexec/arch/ppc64/kexec-zImage-ppc64.c | 5 ++++-
 kexec/kexec.c                         | 2 +-
 2 files changed, 5 insertions(+), 2 deletions(-)

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1.8.3.1