linux-kernel - Re: Bisected Regression 4.3.5 => 4.4.1 booting HP ZBook in EFI mode

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Message-ID: <20160205222936.GA7139@kroah.com>
Date:	Fri, 5 Feb 2016 14:29:36 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Phil Turmel <philip@...mel.org>
Cc:	Boqun Feng <boqun.feng@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: Bisected Regression 4.3.5 => 4.4.1 booting HP ZBook in EFI mode

On Fri, Feb 05, 2016 at 04:48:52PM -0500, Phil Turmel wrote:
> Hello all,
> 
> I tried to get off of v4.3.x today by moving to v4.4.1.
> My laptop failed to boot -- stuck with the BIOS boot logo still
> showing.  I'm direct-booting a merged kernel & initramfs in
> EFI mode.
> 
> I bisected to badc688 "powerpc: Make {cmp}xchg* and their atomic_ versions fully ordered"
> which is upstream commit 81d7a329.
> 
> I'm stumped as to how that powerpc patch can affect my x86 laptop, an
> HP ZBook 17 w/ i7 processor & nouveau graphics, but it certainly
> does.  The bisect was stable and I confirmed by reverting it on
> top of the intended v4.4.1.

That's crazy, nothing should even be rebuilt if you revert that patch,
so I don't see how that could affect things here.

Can you verify that nothing does get rebuilt when you do this?

thanks,

greg k-h