linux-kernel - Re: [linux-pm] [PATCH] PM / Hibernate: Restore old swap signature to avoid user space breakage

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Date:	Sat, 11 Dec 2010 21:49:27 +0100
From:	"R. J. Wysocki" <Rafal.Wysocki@....edu.pl>
To:	Bojan Smojver <bojan@...ursive.com>
Cc:	"Linux-pm mailing list" <linux-pm@...ts.linux-foundation.org>,
	Karel Zak <kzak@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Dr. David Alan Gilbert" <linux@...blig.org>
Subject: Re: [linux-pm] [PATCH] PM / Hibernate: Restore old swap signature to avoid user space breakage

On Saturday, December 11, 2010, Bojan Smojver wrote:
> On Sat, 2010-12-11 at 21:36 +0100, Rafael J. Wysocki wrote:
> 
> > Because that wouldn't fix the user space that _already_ is out there.
> 
> Of course. I'm sure there are other things in various new kernel that
> older user space isn't aware of. It just depends on how far back you
> wish to go.
> 
> > That doesn't matter.  The rule is we don't break user space, even if it does
> > unreasonable things.
> 
> But it won't really be broken. I actually tested compression patches on
> F-14. All you need to do is pass resume argument to grub for 2.6.37
> kernel you installed by hand (and at present, you can only do this by
> hand). If Fedora folks decide to upgrade the kernel to 2.6.37 for F-14
> (they already have for F-15, so they must be aware of the issue), I'm
> sure they'll fix util-linux-ng, dracut and whatever else is required for
> this to work.

Then we can change the signature, no earlier.

> PS. Koji build of the kernel for F-15, based in 2.6.37-rc5:
> 
> http://koji.fedoraproject.org/koji/buildinfo?buildID=208625

Thanks,
Rafael
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