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SubjectRe: top stack (l)users for 2.5.69
> Every time you switch to kernel mode either by
> calling the kernel or by a hardware interrupt, the kernel's stack
> is used.

Almost correct: it's _a_ kernel stack, not _the_ kernel stack.

The load_esp0() function changes this on every task switch on
i386. If there were only one kernel stack then there would be no
need to ever do that...
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