Re: [x86/asm/entry] BUG: unable to handle kernel paging request

[Linus Torvalds]

On Mon, Mar 9, 2015 at 5:04 AM, Denys Vlasenko <vda.linux@xxxxxxxxxxxxxx> wrote:
>
> IIRC task gates weren't used in Linux at first, and now they are
> only used for double fault handler -

Actually, historical note: the TSS was very much used for task
switching originally. Not only was it a "play with how 386 works" test
vehicle, we used pretty much every part of the task switching features
(ie all the ioperm bits etc).

I forget when it was then rewritten to just do everything by hand, but
task gates very much were used.

                       Linus
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