From 5dc1ef858c12f865e3676727e03519bece4ce6c1 Mon Sep 17 00:00:00 2001 From: "Aneesh Kumar K.V" Date: Fri, 29 Apr 2016 23:25:28 +1000 Subject: powerpc/mm: Use big endian Linux page tables for book3s 64 Traditionally Power server machines have used the Hashed Page Table MMU mode. In this mode Linux manages its own tree of nested page tables, aka. "the Linux page tables", which are not used by the hardware directly, and software loads translations into the hash page table for use by the hardware. Power ISA 3.0 defines a new MMU mode, known as Radix Tree Translation, where the hardware can directly operate on the Linux page tables. However the hardware requires that the page tables be in big endian format. To accommodate this, switch the pgtable types to __be64 and add appropriate endian conversions. Because we will be supporting a single kernel binary that boots using either radix or hash mode, we always store the Linux page tables big endian, even in hash mode where they are not actually used by the hardware. Signed-off-by: Aneesh Kumar K.V [mpe: Fix sparse errors, flesh out change log] Signed-off-by: Michael Ellerman --- arch/powerpc/mm/hash64_64k.c | 1 - 1 file changed, 1 deletion(-) (limited to 'arch/powerpc/mm/hash64_64k.c') diff --git a/arch/powerpc/mm/hash64_64k.c b/arch/powerpc/mm/hash64_64k.c index 6fbf983b3ae5..292f40705674 100644 --- a/arch/powerpc/mm/hash64_64k.c +++ b/arch/powerpc/mm/hash64_64k.c @@ -220,7 +220,6 @@ int __hash_page_64K(unsigned long ea, unsigned long access, unsigned long vsid, pte_t *ptep, unsigned long trap, unsigned long flags, int ssize) { - unsigned long hpte_group; unsigned long rflags, pa; unsigned long old_pte, new_pte; -- cgit v1.2.3