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Date:   Fri, 17 Feb 2017 15:02:33 -0800
From:   Andy Lutomirski <>
To:     Linus Torvalds <>
Cc:     "Kirill A. Shutemov" <>,
        Andrew Morton <>,
        "the arch/x86 maintainers" <>,
        Thomas Gleixner <>,
        Ingo Molnar <>, Arnd Bergmann <>,
        "H. Peter Anvin" <>, Andi Kleen <>,
        Dave Hansen <>,
        "" <>,
        linux-mm <>,
        Linux Kernel Mailing List <>,
        Catalin Marinas <>,
        Linux API <>
Subject: Re: [PATCHv3 33/33] mm, x86: introduce PR_SET_MAX_VADDR and PR_GET_MAX_VADDR

On Fri, Feb 17, 2017 at 1:01 PM, Linus Torvalds
<> wrote:
> On Fri, Feb 17, 2017 at 12:12 PM, Andy Lutomirski <> wrote:
>> At the very least, I'd want to see
>> interface.
> That's unrelated, but I guess w could add a MAP_NOUNMAP flag, and then
> you can use MAP_FIXED | MAP_NOUNMAP or something.
> But that has nothing to do with the 47-vs-56 bit issue.
>> How about MAP_LIMIT where the address passed in is interpreted as an
>> upper bound instead of a fixed address?
> Again, that's a unrelated semantic issue. Right now - if you don't
> pass in MAP_FIXED at all, the "addr" argument is used as a starting
> value for deciding where to find an unmapped area. But there is no way
> to specify the end. That would basically be what the process control
> thing would be (not per-system-call, but per-thread ).

What I'm trying to say is: if we're going to do the route of 48-bit
limit unless a specific mmap call requests otherwise, can we at least
have an interface that doesn't suck?

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