linux-kernel - Re: Access to non-RAM pages

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Message-ID: <CA+55aFz_Kbu2PDjqvmgqCFcFSsoRPD=a8vAtPY=--t61X454Jg@mail.gmail.com>
Date:   Sun, 2 Sep 2018 18:38:10 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Jürgen Groß <jgross@...e.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Will Deacon <will.deacon@....com>
Subject: Re: Access to non-RAM pages

On Sun, Sep 2, 2018 at 6:32 PM Benjamin Herrenschmidt
<benh@...nel.crashing.org> wrote:
>
> Also, if we cross page boundaries with those guys then we have a bigger
> problem no ? we could fall off a vmalloc page into the nether or into
> an ioremap mapping no ?

It's not used for vmalloc stuff. It's just regular kmalloc().

So it can cross pages, and it can fall off the end of memory, but it
can't do random stuff.

               Linus