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author | David S. Miller <davem@davemloft.net> | 2013-09-25 14:33:16 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2013-11-12 15:22:35 -0800 |
commit | 2b77933c28f5044629bb19e8045aae65b72b939d (patch) | |
tree | ecb5e23e19599a77748ec54b116ac59341c25a38 /arch/sparc/mm | |
parent | 37b3a8ff3e086cd5c369e77d2383b691b2874cd6 (diff) | |
download | linux-2b77933c28f5044629bb19e8045aae65b72b939d.tar.gz linux-2b77933c28f5044629bb19e8045aae65b72b939d.tar.bz2 linux-2b77933c28f5044629bb19e8045aae65b72b939d.zip |
sparc64: Move to 64-bit PGDs and PMDs.
To make the page tables compact, we were using 32-bit PGDs and PMDs.
We only had to support <= 43 bits of physical addresses so this was
quite feasible.
In order to support larger physical addresses we have to move to
64-bit PGDs and PMDs.
Most of the changes are straight-forward:
1) {pgd,pmd}_t --> unsigned long
2) Anything that tries to use plain "unsigned int" types with pgd/pmd
values needs to be adjusted. In particular things like "0U" become
"0UL".
3) {PGDIR,PMD}_BITS decrease by one.
4) In the assembler page table walkers, use "ldxa" instead of "lduwa"
and adjust the low bit masks to clear out the low 3 bits instead of
just the low 2 bits during pgd/pmd address formation.
Also, use PTRS_PER_PGD and PTRS_PER_PMD in the sizing of the
swapper_{pg_dir,low_pmd_dir} arrays.
This patch does not try to take advantage of having 64-bits in the
PMDs to simplify the hugepage code, that will come in a subsequent
change.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/mm')
-rw-r--r-- | arch/sparc/mm/init_64.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index 807e10833512..828784419e25 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -1842,7 +1842,7 @@ static void __init sun4v_linear_pte_xor_finalize(void) /* paging_init() sets up the page tables */ static unsigned long last_valid_pfn; -pgd_t swapper_pg_dir[2048]; +pgd_t swapper_pg_dir[PTRS_PER_PGD]; static void sun4u_pgprot_init(void); static void sun4v_pgprot_init(void); |