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Date: Thu, 11 Oct 2018 17:08:22 +0200
From: 'Greg KH' <gregkh@linuxfoundation.org>
To: Daniel Sangorrin <daniel.sangorrin@toshiba.co.jp>
Cc: stable@vger.kernel.org
Subject: Re: Backports that remove FPU lazy-mode deadcode for 4.9.y
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On Wed, Jul 18, 2018 at 11:35:34AM +0900, Daniel Sangorrin wrote:
> > From: Greg KH <gregkh@linuxfoundation.org>
> > Sent: Friday, July 13, 2018 11:58 PM
> > On Thu, Jul 12, 2018 at 09:16:33AM +0900, Daniel Sangorrin wrote:
> > > Hello Greg,
> > >
> > > Please consider this backport for 4.9.y. It completes the removal
> > > of FPU lazy-mode code, documentation and comments.
> > >
> > > [PATCH v3 4.9] x86/fpu: Remove use_eager_fpu()
> > >
> > > After applying the patch, please do the following:
> > > 	- cherry-pick: 3913cc350757 ("x86/fpu: Remove struct fpu::counter")
> > > 	- revert: f09a7b0eead7 ("perf: sync up x86/.../cpufeatures.h")
> > > 		- Because the modification in this patch actually belongs to
> > e63650840e8b ("x86/fpu: Finish excising 'eagerfpu'")
> > > 	- cherry-pick: e63650840e8b ("x86/fpu: Finish excising 'eagerfpu'")
> > 
> > That's a major pain.
> >
> > Tell me again why we are doing this for the stable trees?  What does
> > this buy us?  It's nice cleanups sure, but are these going to be needed
> > for future backports?  Something else?
> 
> They are mostly cleanups that complete the series of fpu patches that
> was merged in stable recently, and a Documentation fix (remove
> eagerfpu from the kernel parameters). Ben mentioned that the cleanups
> could help with future backports, but if you prefer we can wait until
> such future backports do exist.

Ok, might as well get this over with now.  All now queued up.

thanks,

greg k-h