linux-kernel - Re: [tip:x86/mm] x86/boot/64: Rewrite startup

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Date:   Tue, 11 Apr 2017 10:54:41 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     kirill.shutemov@...ux.intel.com, dave.hansen@...el.com,
        luto@...capital.net, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        torvalds@...ux-foundation.org, hpa@...or.com, peterz@...radead.org
Cc:     linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/mm] x86/boot/64: Rewrite startup_64() in C


* tip-bot for Kirill A. Shutemov <tipbot@...or.com> wrote:

> Commit-ID:  10ee822ec8c53f3987d969ce98b2686323a7fc2a
> Gitweb:     http://git.kernel.org/tip/10ee822ec8c53f3987d969ce98b2686323a7fc2a
> Author:     Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> AuthorDate: Thu, 6 Apr 2017 17:00:59 +0300
> Committer:  Ingo Molnar <mingo@...nel.org>
> CommitDate: Tue, 11 Apr 2017 08:57:37 +0200
> 
> x86/boot/64: Rewrite startup_64() in C
> 
> The patch converts most of the startup_64 logic from assembly to C.
> 
> This is preparation for 5-level paging enabling.
> 
> No change in functionality.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Andy Lutomirski <luto@...capital.net>
> Cc: Dave Hansen <dave.hansen@...el.com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: linux-arch@...r.kernel.org
> Cc: linux-mm@...ck.org
> Link: http://lkml.kernel.org/r/20170406140106.78087-2-kirill.shutemov@linux.intel.com
> [ Small typo fixes. ]
> Signed-off-by: Ingo Molnar <mingo@...nel.org>
> ---
>  arch/x86/kernel/head64.c  | 81 ++++++++++++++++++++++++++++++++++++++++-
>  arch/x86/kernel/head_64.S | 93 +----------------------------------------------
>  2 files changed, 81 insertions(+), 93 deletions(-)

Hm, so I had to zap this commit as it broke booting on a 64-bit Intel and an AMD 
system as well, with defconfig-ish kernels.

I've attached the failing config. There's no serial console output at all, the 
boot just hangs after the Grub messages.

Thanks,

	Ingo

View attachment ".config" of type "text/plain" (112278 bytes)