Hi Lasse, I am checking a thread related to kaslr and setup_data issue on x86: https://lkml.org/lkml/2015/7/7/963
Now I have a question about the commit from you: commit 303148045aac34b70db722a54e5ad94a3a6625c6 Author: Lasse Collin <[email protected]> Date: Wed Jan 12 17:01:24 2011 -0800 x86: support XZ-compressed kernel In this commit for adding support of XZ-compressed kernel on x86, you add extra 32K to the extract_offset. In commit log you said this is because "The XZ decompressor needs around 30 KiB of heap, so the heap size is increased to 32 KiB on both x86-32 and x86-64." With my understanding decompression is done in decompression stage and it uses boot_heap in arch/x86/boot/compressed/head_64.S, and boot_heap is assigned to free_mem_ptr which is used for decompression heap malloc. During this decompressio stage it's still in copied ZO space, why did you add extra 32K space to extract_offset? If you want to increase the decompression heap space shouldn't you decrease the extract_offset? Do I misunderstand anything or miss things? Please help answer, I really don't understand this. Thanks Baoquan
