[PATCH v2 10/12] ARM: only consider memblocks with NOMAP cleared for linear mapping

On 16 November 2015 at 20:00, Russell King - ARM Linux
[off-list ref] wrote:

On Mon, Nov 16, 2015 at 07:32:35PM +0100, Ard Biesheuvel wrote:

quoted

Take the new memblock attribute MEMBLOCK_NOMAP into account when
deciding whether a certain region is or should be covered by the
kernel direct mapping.

It's probably worth looking at this as a replacement to the way
arm_memblock_steal() works, provided NOMAP doesn't result in the
memory being passed to the kernel allocators.  Thoughts?

Yes. The primary reason for NOMAP is that the memory is not removed,
so we don't lose the annotation that it is memory (which might be
useful, for instance, for /dev/mem attribute handling)