From bc033b63bbfeb6c4b4eb0a1d083c650e4a0d2af8 Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Tue, 5 Aug 2008 16:19:56 +1000 Subject: powerpc/mm: Fix attribute confusion with htab_bolt_mapping() The function htab_bolt_mapping() is used to create permanent mappings in the MMU hash table, for example, in order to create the linear mapping of vmemmap. It's also used by early boot ioremap (before mem_init_done). However, the way ioremap uses it is incorrect as it passes it the protection flags in the "linux PTE" form while htab_bolt_mapping() expects them in the hash table format. This is made more confusing by the fact that some of those flags are actually in the same position in both cases. This fixes it all by making htab_bolt_mapping() take normal linux protection flags instead, and use a little helper to convert them to htab flags. Callers can now use the usual PAGE_* definitions safely. Signed-off-by: Benjamin Herrenschmidt arch/powerpc/include/asm/mmu-hash64.h | 2 - arch/powerpc/mm/hash_utils_64.c | 65 ++++++++++++++++++++-------------- arch/powerpc/mm/init_64.c | 9 +--- 3 files changed, 44 insertions(+), 32 deletions(-) Signed-off-by: Paul Mackerras --- arch/powerpc/mm/init_64.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) (limited to 'arch/powerpc/mm/init_64.c') diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c index 4f7df85129d..036fe2f10c7 100644 --- a/arch/powerpc/mm/init_64.c +++ b/arch/powerpc/mm/init_64.c @@ -206,13 +206,10 @@ static int __meminit vmemmap_populated(unsigned long start, int page_size) int __meminit vmemmap_populate(struct page *start_page, unsigned long nr_pages, int node) { - unsigned long mode_rw; unsigned long start = (unsigned long)start_page; unsigned long end = (unsigned long)(start_page + nr_pages); unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift; - mode_rw = _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX; - /* Align to the page size of the linear mapping. */ start = _ALIGN_DOWN(start, page_size); @@ -230,9 +227,9 @@ int __meminit vmemmap_populate(struct page *start_page, pr_debug("vmemmap %08lx allocated at %p, physical %08lx.\n", start, p, __pa(p)); - mapped = htab_bolt_mapping(start, start + page_size, - __pa(p), mode_rw, mmu_vmemmap_psize, - mmu_kernel_ssize); + mapped = htab_bolt_mapping(start, start + page_size, __pa(p), + PAGE_KERNEL, mmu_vmemmap_psize, + mmu_kernel_ssize); BUG_ON(mapped < 0); } -- cgit v1.2.2