linux-kernel - Re: Linux 3.3-rc5

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Message-ID: <20120227215908.GA4952@redhat.com>
Date:	Mon, 27 Feb 2012 23:59:09 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 3.3-rc5

On Sat, Feb 25, 2012 at 12:34:20PM -0800, Linus Torvalds wrote:
> Hey, no delays this week.
> 
> And nothing really odd going on either. Maybe things are finally calming down.
> 
> Sure, I'd have liked it to be even calmer, and there's is movement in
> various areas: btrfs updates along with scsi and media driver updates.
> And various noise elsewhere. But on the whole it's been pretty boring,
> which is just how I like it.
> 
> A couple of the fixes were directly linked to my -rc4 announcement,
> where I told people they could use a 64-bit kernel to avoid the FP
> state save/restore problem we used to have. That brought up some
> fairly corner-case compatibility issues that could make that
> impractical. So hopefully it's *true* this time around.
> 
> And while the FP state save problem is gone, if you have a 64-bit
> capable CPU but are still running a 32-bit distro, it really would be
> interesting to verify that a 64-bit kernel works for you without
> problems. Because it always *should* have, but clearly that wasn't
> always the case. It would be very interesting to hear from people who
> have perhaps tried and failed before and perhaps didn't even bother to
> report the failure? Maybe it's worth trying again?
> 
>                           Linus

Yes, I just tried.

IIRC, I used to run 64 bit upstream kernels with 32 bit userspace
under Fedora 14 (because I can) this stopped booting when I switched
to Fedora 15, I think the upstream kernel was 2.6.39 at that time,
so I stopped trying.

With 3.3.0-rc5, a 64 bit kernel works fine for me, again.
Yay!

As a side note, it's a pity that gcc in 32 bit Fedora
does not support -m 64 to support building 64 bit kernels.

-- 
MST
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