From d28513bc7f675d28b479db666d572e078ecf182d Mon Sep 17 00:00:00 2001 From: David Gibson Date: Thu, 26 Nov 2009 18:56:04 +0000 Subject: powerpc/mm: Fix pgtable cache cleanup with CONFIG_PPC_SUBPAGE_PROT Commit a0668cdc154e54bf0c85182e0535eea237d53146 cleans up the handling of kmem_caches for allocating various levels of pagetables. Unfortunately, it conflicts badly with CONFIG_PPC_SUBPAGE_PROT, due to the latter's cleverly hidden technique of adding some extra allocation space to the top level page directory to store the extra information it needs. Since that extra allocation really doesn't fit into the cleaned up page directory allocating scheme, this patch alters CONFIG_PPC_SUBPAGE_PROT to instead allocate its struct subpage_prot_table as part of the mm_context_t. Signed-off-by: David Gibson Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/mm/subpage-prot.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) (limited to 'arch/powerpc/mm/subpage-prot.c') diff --git a/arch/powerpc/mm/subpage-prot.c b/arch/powerpc/mm/subpage-prot.c index 4cafc0c33d0a..a040b81e93bd 100644 --- a/arch/powerpc/mm/subpage-prot.c +++ b/arch/powerpc/mm/subpage-prot.c @@ -24,9 +24,9 @@ * Also makes sure that the subpage_prot_table structure is * reinitialized for the next user. */ -void subpage_prot_free(pgd_t *pgd) +void subpage_prot_free(struct mm_struct *mm) { - struct subpage_prot_table *spt = pgd_subpage_prot(pgd); + struct subpage_prot_table *spt = &mm->context.spt; unsigned long i, j, addr; u32 **p; @@ -51,6 +51,13 @@ void subpage_prot_free(pgd_t *pgd) spt->maxaddr = 0; } +void subpage_prot_init_new_context(struct mm_struct *mm) +{ + struct subpage_prot_table *spt = &mm->context.spt; + + memset(spt, 0, sizeof(*spt)); +} + static void hpte_flush_range(struct mm_struct *mm, unsigned long addr, int npages) { @@ -87,7 +94,7 @@ static void hpte_flush_range(struct mm_struct *mm, unsigned long addr, static void subpage_prot_clear(unsigned long addr, unsigned long len) { struct mm_struct *mm = current->mm; - struct subpage_prot_table *spt = pgd_subpage_prot(mm->pgd); + struct subpage_prot_table *spt = &mm->context.spt; u32 **spm, *spp; int i, nw; unsigned long next, limit; @@ -136,7 +143,7 @@ static void subpage_prot_clear(unsigned long addr, unsigned long len) long sys_subpage_prot(unsigned long addr, unsigned long len, u32 __user *map) { struct mm_struct *mm = current->mm; - struct subpage_prot_table *spt = pgd_subpage_prot(mm->pgd); + struct subpage_prot_table *spt = &mm->context.spt; u32 **spm, *spp; int i, nw; unsigned long next, limit; -- cgit v1.2.3