how can I cleanly exclude memory from the kernel memory allocator?

Larry Bassel lbassel at
Tue Apr 19 19:33:36 EDT 2011

On 25 Mar 11 20:27, Russell King - ARM Linux wrote:
> On Fri, Mar 25, 2011 at 10:39:28AM -0700, Larry Bassel wrote:
> > OK, please ignore my previous mail, I see that .fixup can be
> > used to adjust tags. It appears to me, however, that using a
> > .reserve function calling memblock_reserve will be an
> > easier way of doing what I need.
> Absolutely.

Hopefully I'm just missing something obvious, but
when I call memblock_reserve (in .38) to reserve a block
of memory away from the general kernel memory pool,
I find that an ioremap of memory within the reserved block
still fails because pte_valid() is apparently true.

Is this intended behavior? If so, what would the
correct way of separating memory from the system be
so that there is no longer a 1-to-1 1M mapping for
this memory and ioremap (creating the *only* mapping
for this memory) is allowed?



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