Creating kernel mappings for memory initially marked with bootmem NOMAP?

[Russell King - ARM Linux]

On Wed, Mar 08, 2017 at 07:26:53PM +0000, Russell King - ARM Linux wrote:
> On Wed, Mar 08, 2017 at 11:03:43AM -0800, Florian Fainelli wrote:
> > Now, we have some peripherals that want large chunks of physically and
> > virtually contiguous memory that belong to these memblock NOMAP ranges.
> > I have no problems using mmap() against this memory, because the kernel
> > will do what is necessary for a process to map it for me. The struggle
> > is for a kernel driver which specifies a range of physical memory and
> > size, and expects a virtually contiguous mapping in return (not using
> > DMA-API, because reasons).
> 
> Will vm_iomap_memory() do the job?

Sorry, I thought you were asking about userspace.  The memremap()
family of functions is what you want for mapping it into the kernel.

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