RFP prot support: support private vma for MAP_POPULATE From: Ingo Molnar Fix mmap(MAP_POPULATE | MAP_PRIVATE). We don't need the VMA to be shared if we don't rearrange pages around. And it's trivial to do. Signed-off-by: Paolo 'Blaisorblade' Giarrusso --- mm/fremap.c | 7 ++++--- 1 files changed, 4 insertions(+), 3 deletions(-) diff --git a/mm/fremap.c b/mm/fremap.c index e62dc15..b1db410 100644 --- a/mm/fremap.c +++ b/mm/fremap.c @@ -191,9 +191,6 @@ retry: if (!vma) goto out_unlock; - if (!(vma->vm_flags & VM_SHARED)) - goto out_unlock; - if (!vma->vm_ops || !vma->vm_ops->populate) goto out_unlock; @@ -218,6 +215,8 @@ retry: /* Must set VM_NONLINEAR before any pages are populated. */ if (pgoff != linear_page_index(vma, start) && !(vma->vm_flags & VM_NONLINEAR)) { + if (!(vma->vm_flags & VM_SHARED)) + goto out_unlock; if (!has_write_lock) { up_read(&mm->mmap_sem); down_write(&mm->mmap_sem); @@ -236,6 +235,8 @@ retry: if (pgprot_val(pgprot) != pgprot_val(vma->vm_page_prot) && !(vma->vm_flags & VM_MANYPROTS)) { + if (!(vma->vm_flags & VM_SHARED)) + goto out_unlock; if (!has_write_lock) { up_read(&mm->mmap_sem); down_write(&mm->mmap_sem);