kernel stack for linux process

Question

Is the kernel stack for all process shared or there is a seperate kernel stack for each process? If it is seperate for each process where is this stack pointer stored? In task_s

Answer 1

This old article says that each process has its own kernel stack. See comments to why that seems to be a very good design.

I tried reading the current source to make sure, but since the kernel stack is "implicit", it's not visible in the task_struct. This is mentioned in the article.

This answer was edited to incorporate wisdom from comments. Thanks.