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

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Message-ID: <CA+55aFw05mSdtzDGBb12EHxZTpSa0LNy2LkkCnEo4N6M1D6aqw@mail.gmail.com>
Date:	Mon, 9 Mar 2015 09:12:48 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Denys Vlasenko <vda.linux@...glemail.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Fengguang Wu <fengguang.wu@...el.com>, X86 ML <x86@...nel.org>,
	LKP <lkp@...org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [x86/asm/entry] BUG: unable to handle kernel paging request

On Mon, Mar 9, 2015 at 5:04 AM, Denys Vlasenko <vda.linux@...glemail.com> 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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