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

> Commit-ID:  10ee822ec8c53f3987d969ce98b2686323a7fc2a
> Gitweb:     http://git.kernel.org/tip/10ee822ec8c53f3987d969ce98b2686323a7fc2a
> Author:     Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> AuthorDate: Thu, 6 Apr 2017 17:00:59 +0300
> Committer:  Ingo Molnar <mingo@kernel.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@linux.intel.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Andy Lutomirski <luto@amacapital.net>
> Cc: Dave Hansen <dave.hansen@intel.com>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: linux-arch@vger.kernel.org
> Cc: linux-mm@kvack.org
> Link: http://lkml.kernel.org/r/20170406140106.78087-2-kirill.shutemov@linux.intel.com
> [ Small typo fixes. ]
> Signed-off-by: Ingo Molnar <mingo@kernel.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