linux-kernel - Re: [x86, vdso] BUG: unable to handle kernel paging request at d34bd000

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Date:	Mon, 10 Mar 2014 14:39:19 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Stefani Seibold <stefani@...bold.net>
Cc:	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Andy Lutomirski <luto@...capital.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andreas Brief <Andreas.Brief@...de-schwarz.com>,
	Martin Runge <Martin.Runge@...de-schwarz.com>
Subject: Re: [x86, vdso] BUG: unable to handle kernel paging request at d34bd000

On Mon, Mar 10, 2014 at 2:25 PM,  <stefani@...bold.net> wrote:
>
> This was discovered by me.

Sorry for the misattribution.

> But this is not a real solution, at least when vcpu function support
> will be added, then the code size will exceed the page size. Reserving
> two pages for the VDSO is a good option.

Quite frankly, there is no way in hell I will take a patch like that
for 3.14 any more, and I would argue against it for stable.

Now, if this problem never happens with current kernels (because it's
purely due to the patch in -tip), then I don't much care.

That said, I don't understand why we are even adding new features like
this to 32-bit mode in the first place, so if that patch is the sole
source of all this headache, then why not just throw the patch away?

             Linus
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