diff options
| -rw-r--r-- | arch/powerpc/mm/hugetlbpage.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index d0ec887f05a2..1f07f70ac89f 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -566,6 +566,13 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, if (len > TASK_SIZE) return -ENOMEM; + /* handle fixed mapping: prevent overlap with huge pages */ + if (flags & MAP_FIXED) { + if (is_hugepage_only_range(mm, addr, len)) + return -EINVAL; + return addr; + } + if (addr) { addr = PAGE_ALIGN(addr); vma = find_vma(mm, addr); @@ -641,6 +648,13 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, if (len > TASK_SIZE) return -ENOMEM; + /* handle fixed mapping: prevent overlap with huge pages */ + if (flags & MAP_FIXED) { + if (is_hugepage_only_range(mm, addr, len)) + return -EINVAL; + return addr; + } + /* dont allow allocations above current base */ if (mm->free_area_cache > base) mm->free_area_cache = base; @@ -823,6 +837,13 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, /* Paranoia, caller should have dealt with this */ BUG_ON((addr + len) < addr); + /* Handle MAP_FIXED */ + if (flags & MAP_FIXED) { + if (prepare_hugepage_range(addr, len, pgoff)) + return -EINVAL; + return addr; + } + if (test_thread_flag(TIF_32BIT)) { curareas = current->mm->context.low_htlb_areas; |
