From: Rick Lindsley <rickl...@linux.vnet.ibm.com> With the 512TB virtual addressing capability, a new field was added to the paca and mm_context (addr_limit) to track the process's desire to use the larger addressing space. Functions in the radix-enabled path (mmap.c) were modified to inspect this value when deciding whether to grant or deny requests in that range.
However, the non-radix path falls through to the old, hashed slice code (slice_get_unmapped_area, etc.) and these code paths still inspect task_size. The same attention to addr_limit made in (for example) radix__arch_get_unmapped_area() should also be applied to (correspondingly) slice_get_unmapped_area(). Signed-off-by: Rick Lindsley <rickl...@linux.vnet.ibm.com> --- arch/powerpc/mm/slice.c | 12 ++++++------ 1 files changed, 6 insertions(+), 6 deletions(-) diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c index 251b6ba..c023bff 100644 --- a/arch/powerpc/mm/slice.c +++ b/arch/powerpc/mm/slice.c @@ -96,7 +96,7 @@ static int slice_area_is_free(struct mm_struct *mm, unsigned long addr, { struct vm_area_struct *vma; - if ((mm->task_size - len) < addr) + if ((mm->addr_limit - len) < addr) return 0; vma = find_vma(mm, addr); return (!vma || (addr + len) <= vma->vm_start); @@ -133,7 +133,7 @@ static void slice_mask_for_free(struct mm_struct *mm, struct slice_mask *ret) if (!slice_low_has_vma(mm, i)) ret->low_slices |= 1u << i; - if (mm->task_size <= SLICE_LOW_TOP) + if (mm->addr_limit <= SLICE_LOW_TOP) return; for (i = 0; i < GET_HIGH_SLICE_INDEX(mm->context.addr_limit); i++) @@ -444,20 +444,20 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len, bitmap_zero(compat_mask.high_slices, SLICE_NUM_HIGH); /* Sanity checks */ - BUG_ON(mm->task_size == 0); + BUG_ON(mm->addr_limit == 0); VM_BUG_ON(radix_enabled()); slice_dbg("slice_get_unmapped_area(mm=%p, psize=%d...\n", mm, psize); slice_dbg(" addr=%lx, len=%lx, flags=%lx, topdown=%d\n", addr, len, flags, topdown); - if (len > mm->task_size) + if (len > mm->addr_limit) return -ENOMEM; if (len & ((1ul << pshift) - 1)) return -EINVAL; if (fixed && (addr & ((1ul << pshift) - 1))) return -EINVAL; - if (fixed && addr > (mm->task_size - len)) + if (fixed && addr > (mm->addr_limit - len)) return -ENOMEM; /* If hint, make sure it matches our alignment restrictions */ @@ -465,7 +465,7 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len, addr = _ALIGN_UP(addr, 1ul << pshift); slice_dbg(" aligned addr=%lx\n", addr); /* Ignore hint if it's too large or overlaps a VMA */ - if (addr > mm->task_size - len || + if (addr > mm->addr_limit - len || !slice_area_is_free(mm, addr, len)) addr = 0; } -- 1.7.1