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powerpc/mm: Correct process and partition table max size

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commit 555c16328a upstream.

Version 3.00 of the ISA states that the PATS (partition table size) field
of the PTCR (partition table control register) and the PRTS (process table
size) field of the partition table entry must both be less than or equal
to 24. However the actual size of the partition and process tables is equal
to 2 to the power of 12 plus the PATS and PRTS fields, respectively. This
means that the max allowable size of each of these tables is 2^36 or 64GB
for both.

Thus when checking the size shift for each we should be checking for values
of greater than 36 instead of the current check for shifts larger than 24
and 23.

Fixes: 2bfd65e45e
Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Reviewed-by: Balbir Singh <bsingharora@gmail.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suraj Jitindar Singh
2016-11-09 16:36:33 +11:00
committed by Greg Kroah-Hartman
parent 42eded92c4
commit ae4c24b2d5
1 changed files with 2 additions and 2 deletions
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4
arch/powerpc/mm/pgtable-radix.c
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@@ -159,7 +159,7 @@ redo:
* Allocate Partition table and process table for the
* host.
*/
BUILD_BUG_ON_MSG((PRTB_SIZE_SHIFT > 23), "Process table size too large.");
BUILD_BUG_ON_MSG((PRTB_SIZE_SHIFT > 36), "Process table size too large.");
process_tb = early_alloc_pgtable(1UL << PRTB_SIZE_SHIFT);
/*
* Fill in the process table.
@@ -181,7 +181,7 @@ static void __init radix_init_partition_table(void)
rts_field = radix__get_tree_size();
BUILD_BUG_ON_MSG((PATB_SIZE_SHIFT > 24), "Partition table size too large.");
BUILD_BUG_ON_MSG((PATB_SIZE_SHIFT > 36), "Partition table size too large.");
partition_tb = early_alloc_pgtable(1UL << PATB_SIZE_SHIFT);
partition_tb->patb0 = cpu_to_be64(rts_field | __pa(init_mm.pgd) |
RADIX_PGD_INDEX_SIZE | PATB_HR);