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I have edited a file in linux kernel kernel/sched/fair.c and want to see the pre-processed output to see the expanded macros.

Adding CFLAGS_fair.o := -Wa,-adhlns="fair.lst" in kernel/sched/Makefile doesn't work out.

Compiling the kernel for specific file only using below command:

make -j8 kernel/sched/fair.o

Adding -E to the CFLAGS_fair.o gives warning: objtool: gelf_getehdr: invalid Elf' handle` for that file.

When trying to decrypt encrypted file with aes-256-cbc, it says the bad magic number.
The encrypted file is in base64 encoding.
So run below command to decrypt with base64 deconding first:

cat encrypted_file | base64 --decode | openssl aes-256-cbc -d