Date: Thu, 8 Dec 2016 22:24:37 +0300
From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Randy Dunlap <rdunlap@infradead.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>, x86@kernel.org,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        Arnd Bergmann <arnd@arndb.de>, "H. Peter Anvin" <hpa@zytor.com>,
        Andi Kleen <ak@linux.intel.com>, Dave Hansen <dave.hansen@intel.com>,
        Andy Lutomirski <luto@amacapital.net>, linux-arch@vger.kernel.org,
        linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC, PATCHv1 17/28] x86/mm: define virtual memory map for
 5-level paging
Message-ID: <20161208192437.GC30380@node.shutemov.name>
References: <20161208162150.148763-1-kirill.shutemov@linux.intel.com>
 <20161208162150.148763-19-kirill.shutemov@linux.intel.com>
 <24bebd32-2056-dd5a-8b77-d2a9572dc512@infradead.org>
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On Thu, Dec 08, 2016 at 10:56:04AM -0800, Randy Dunlap wrote:
> > @@ -23,6 +23,27 @@ ffffffffa0000000 - ffffffffff5fffff (=1526 MB) module mapping space
> >  ffffffffff600000 - ffffffffffdfffff (=8 MB) vsyscalls
> >  ffffffffffe00000 - ffffffffffffffff (=2 MB) unused hole
> >  
> > +Virtual memory map with 5 level page tables:
> > +
> > +0000000000000000 - 00ffffffffffffff (=56 bits) user space, different per mm
> > +hole caused by [57:63] sign extension
> 
> Can you briefly explain the sign extension?

Sure, I'll update it on respin.

> Should that be [56:63]?

You're right, it should. 

Thanks for all your corrections.

-- 
 Kirill A. Shutemov