Will kernel in-place decompression overwrite uncompressed part ?

Dear All, Before, kernel first decompressed to other memory location and then merged and put at final destination. Now, kernel decompression are decompressed in-place, so-called in-place decompression. But the compressed part is encompassed by uncompressed part. So, after decompression, will the uncompressed part be overwritten by the decompressed kernel ? If so, some uncompressed part such as deal with kernel relocation will be overwritten by the decompressed kernel, which don't make sense, am I missed something ? Regards, Jacky