tree 315a5dab9ff34a0f7a21dce093eb9687852c5a1a
parent 0e65bfe34c1000581746b9889d095241c4cf4a5c
author Dale Farnsworth <dale@farnsworth.org> 1191438100 -0700
committer Kumar Gala <galak@kernel.crashing.org> 1191850714 -0500

[POWERPC] 85xx: Failure with odd memory sizes and CONFIG_HIGHMEM

The CONFIG_FSL_BOOKE mmu setup code fails when CONFIG_HIGHMEM=y
and the 3 fixed TLB entries cannot exactly map the lowmem size.
Each TLB entry can map 4MB, 16MB, 64MB or 256MB, so the failure
is observed when the kernel lowmem size is not equal to the
sum of up to 3 of those values.

Normally, memory is sized in nice numbers, but I observed this
problem while testing a crash dump kernel.  The failure can
also be observed by artificially reducing the kernel's main
memory via the mem= kernel command line parameter.

This commit fixes the problem by setting __initial_memory_limit
in adjust_total_lowmem().

Signed-off-by: Dale Farnsworth <dale@farnsworth.org>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>