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powerpc/mm/radix: Limit paca allocation in radix

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On return from RTAS we access the paca variables and we have 64 bit
disabled. This requires us to limit paca in 32 bit range.

Fix this by setting ppc64_rma_size to first_memblock_size/1G range.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V 2016-04-29 23:26:10 +10:00 committed by Michael Ellerman
parent 764041e0f4
commit 177ba7c647
1 changed files with 19 additions and 1 deletions
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20
arch/powerpc/mm/pgtable-radix.c
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@ -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);
}