mm: allow remote_vm access to non-io pfnmap memory

this allows gdb to see the framebuffer and DSP shared memory

diff --git a/mm/memory.c b/mm/memory.c
index e138bf4..b9a95f1 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3875,7 +3875,11 @@ static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
                        vma = find_vma(mm, addr);
                        if (!vma || vma->vm_start > addr)
                                break;
                        vma = find_vma(mm, addr);
                        if (!vma || vma->vm_start > addr)
                                break;

-                       if (vma->vm_ops && vma->vm_ops->access)
+                       if ((vma->vm_flags & VM_PFNMAP) &&
+                           !(vma->vm_flags & VM_IO))
+                               ret = generic_access_phys(vma, addr, buf,
+                                                         len, write);
+                       if (ret <= 0 && vma->vm_ops && vma->vm_ops->access)

                                ret = vma->vm_ops->access(vma, addr, buf,
                                                          len, write);
                        if (ret <= 0)
                                ret = vma->vm_ops->access(vma, addr, buf,
                                                          len, write);
                        if (ret <= 0)