Re: Access to non-RAM pages

[Linus Torvalds]

On Sun, Sep 2, 2018 at 6:32 PM Benjamin Herrenschmidt
<benh@xxxxxxxxxxxxxxxxxxx> 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