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SubjectRe: x86-tip.today (4cdf573) early instaboot

* Mike Galbraith <efault@gmx.de> wrote:

> On Tue, 2018-04-10 at 09:06 -0500, Tom Lendacky wrote:
> >
> > Just out of curiosity, can you try the following patch and see if it
> > fixes your reboot issue:
>
> Yup, all better.
>
> > diff --git a/arch/x86/boot/compressed/kaslr.c
> > b/arch/x86/boot/compressed/kaslr.c
> > index c5196d2..a0a50b9 100644
> > --- a/arch/x86/boot/compressed/kaslr.c
> > +++ b/arch/x86/boot/compressed/kaslr.c
> > @@ -55,7 +55,7 @@
> > extern unsigned long get_cmd_line_ptr(void);
> >
> > /* Used by PAGE_KERN* macros: */
> > -pteval_t __default_kernel_pte_mask __read_mostly;
> > +pteval_t __default_kernel_pte_mask __read_mostly = ~0;
> >
> > /* Simplified build-specific string for starting entropy. */
> > static const char build_str[] = UTS_RELEASE " (" LINUX_COMPILE_BY "@"

Thanks guys!

I ended up back-merging this fix (and another fix) into:

fb43d6cb91ef: x86/mm: Do not auto-massage page protections

I added credits as:

- printk format warning fix from: Arnd Bergmann <arnd@arndb.de>
- boot crash fix from: Tom Lendacky <thomas.lendacky@amd.com>
- crash bisected by: Mike Galbraith <efault@gmx.de>

...

Reported-and-fixed-by: Arnd Bergmann <arnd@arndb.de>
Fixed-by: Tom Lendacky <thomas.lendacky@amd.com>
Bisected-by: Mike Galbraith <efault@gmx.de>

Thanks,

Ingo

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