[PATCH 2/2] powerpc/fsl-booke: Fix setup_initial_memory_limit to not blindly map

[Kumar Gala]

On Sep 16, 2011, at 10:39 AM, Kumar Gala wrote:

> On FSL Book-E devices we support multiple large TLB sizes and so we can
> get into situations in which the initial 1G TLB size is too big and
> we're asked for a size that is not mappable by a single entry (like
> 512M).  The single entry is important because when we bring up secondary
> cores they need to ensure any data structure they need to access (eg
> PACA or stack) is always mapped.
> 
> So we really need to determine what size will actually be mapped by the
> first TLB entry to ensure we limit early memory references to that
> region.  We refactor the map_mem_in_cams() code to provider a helper
> function that we can utilize to determine the size of the first TLB
> entry while taking into account size and alignment constraints.
> 
> Signed-off-by: Kumar Gala <galak at kernel.crashing.org>
> ---
> arch/powerpc/mm/fsl_booke_mmu.c |   31 +++++++++++++++++++------------
> arch/powerpc/mm/mmu_decl.h      |    2 ++
> arch/powerpc/mm/tlb_nohash.c    |   21 ++++++++++++++++++---
> 3 files changed, 39 insertions(+), 15 deletions(-)

applied

- k