linux-kernel - Re: [tip:x86/boot] x86/boot/compressed/64: Prepare trampoline memory

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Date:   Mon, 26 Feb 2018 08:50:27 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     Borislav Petkov <bp@...e.de>, tglx@...utronix.de,
        torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
        willy@...radead.org, hpa@...or.com,
        kirill.shutemov@...ux.intel.com, peterz@...radead.org,
        gorcunov@...nvz.org, luto@...capital.net,
        linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/boot] x86/boot/compressed/64: Prepare trampoline memory


* Ingo Molnar <mingo@...nel.org> wrote:

> We need to re-do this as we have now run into _exactly_ the kind of difficult to 
> debug bug that I was worried about when I insisted on the many iterations of 
> this patch-set...

Ok, so I rebased tip:x86/mm and removed these two commits:

adf9ca9c69a2: x86/boot/compressed/64: Handle 5-level paging boot if kernel is above 4G

 arch/x86/boot/compressed/head_64.S | 127 ++++++++++++++++++++++++++-----------
 1 file changed, 89 insertions(+), 38 deletions(-)

b91993a87aff: x86/boot/compressed/64: Prepare trampoline memory

 arch/x86/boot/compressed/head_64.S    | 24 ++++++++++-
 arch/x86/boot/compressed/pgtable.h    | 18 ++++++++
 arch/x86/boot/compressed/pgtable_64.c | 79 +++++++++++++++++++++++++++++++++++
 3 files changed, 120 insertions(+), 1 deletion(-)

The other 5-level paging related commits tested out fine and are properly 
fine-grained.

Please split these two patches up - the first patch can probably be split up into 
5 parts or so. Let's start with no more than 5 patches per iteration, ok?

Thanks,

	Ingo