Re: [PATCH v10 13/17] mm: vmalloc: add flag preventing guard hole allocation

[Andrew Morton]

On Thu, 29 Jan 2015 18:11:57 +0300 Andrey Ryabinin <a.ryabinin@xxxxxxxxxxx> wrote:

> For instrumenting global variables KASan will shadow memory
> backing memory for modules. So on module loading we will need
> to allocate shadow memory and map it at exact virtual address.

I don't understand.  What does "map it at exact virtual address" mean?

> __vmalloc_node_range() seems like the best fit for that purpose,
> except it puts a guard hole after allocated area.

Why is the guard hole a problem?

More details needed in this changelog, please.


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