diff options
Diffstat (limited to 'arch/powerpc/mm/pgtable-radix.c')
| -rw-r--r-- | arch/powerpc/mm/pgtable-radix.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c index 0472f8aa40e1..04ec9760380d 100644 --- a/arch/powerpc/mm/pgtable-radix.c +++ b/arch/powerpc/mm/pgtable-radix.c @@ -351,7 +351,25 @@ void radix__early_init_mmu_secondary(void) void radix__setup_initial_memory_limit(phys_addr_t first_memblock_base, phys_addr_t first_memblock_size) { - /* Finally limit subsequent allocations */ + /* We don't currently support the first MEMBLOCK not mapping 0 + * physical on those processors + */ + BUG_ON(first_memblock_base != 0); + /* + * We limit the allocation that depend on ppc64_rma_size + * to first_memblock_size. We also clamp it to 1GB to + * avoid some funky things such as RTAS bugs. + * + * On radix config we really don't have a limitation + * on real mode access. But keeping it as above works + * well enough. + */ + ppc64_rma_size = min_t(u64, first_memblock_size, 0x40000000); + /* + * Finally limit subsequent allocations. We really don't want + * to limit the memblock allocations to rma_size. FIXME!! should + * we even limit at all ? + */ memblock_set_current_limit(first_memblock_base + first_memblock_size); } |