Suraj Jitindar Singh <sjitindarsi...@gmail.com> writes: > 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: 2bfd65e45e877fb5704730244da67c748d28a1b8 > Signed-off-by: Suraj Jitindar Singh <sjitindarsi...@gmail.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com> > --- > arch/powerpc/mm/pgtable-radix.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c > index ed7bddc..80f3479 100644 > --- a/arch/powerpc/mm/pgtable-radix.c > +++ b/arch/powerpc/mm/pgtable-radix.c > @@ -159,7 +159,7 @@ static void __init radix_init_pgtable(void) > * 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); > -- > 2.5.5
