Process descriptor pointer doesn't match current macro in Linux Kernel?

This is because at the base of the kernel stack you will find a struct thread_info instance (platform dependent) and not a struct task_struct . The current() macro provides a pointer to the current task_struct .

Finally, I solved this problem. Everything is correct expect for the size of kernel stack. My kernel use 4KB stack instead of 8KB stack.

So I just need to mask low 12 bits of the ESP. Thanks for all the suggestions and answer!

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