The shadow_get function does't consider the case that
'shadow is inpace', and after the shadow->data be set to the data,
it will not be the pointer. This patch fix it.
Signed-off-by: Li Bin <huawei.libin@huawei.com>
This adds support for shadow variables, which allow you to add new
"shadow" fields to existing data structures.
To allow patches to call the shadow functions in the core module, I had
to add a funky hack to use --warn-unresolved-symbols when linking, which
allows the patched vmlinux to link with the missing symbols. I also
added greps to the log file to ensure that only unresolved symbols to
kpatch_shadow_* are allowed. We can remove this hack once the core
module gets moved into the kernel tree.
Fixes#314.
