dev-dax: check_vma: ratelimit dev_info-s

This is easily triggered from userspace, so let's ratelimit the
messages.

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index de2f829..108c37f 100644 (file)
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -189,14 +189,16 @@ static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma,
 
        /* prevent private mappings from being established */
        if ((vma->vm_flags & VM_MAYSHARE) != VM_MAYSHARE) {
-               dev_info(dev, "%s: %s: fail, attempted private mapping\n",
+               dev_info_ratelimited(dev,
+                               "%s: %s: fail, attempted private mapping\n",
                                current->comm, func);
                return -EINVAL;
        }
 
        mask = dax_region->align - 1;
        if (vma->vm_start & mask || vma->vm_end & mask) {
-               dev_info(dev, "%s: %s: fail, unaligned vma (%#lx - %#lx, %#lx)\n",
+               dev_info_ratelimited(dev,
+                               "%s: %s: fail, unaligned vma (%#lx - %#lx, %#lx)\n",
                                current->comm, func, vma->vm_start, vma->vm_end,
                                mask);
                return -EINVAL;
@@ -204,13 +206,15 @@ static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma,
 
        if ((dax_region->pfn_flags & (PFN_DEV|PFN_MAP)) == PFN_DEV
                        && (vma->vm_flags & VM_DONTCOPY) == 0) {
-               dev_info(dev, "%s: %s: fail, dax range requires MADV_DONTFORK\n",
+               dev_info_ratelimited(dev,
+                               "%s: %s: fail, dax range requires MADV_DONTFORK\n",
                                current->comm, func);
                return -EINVAL;
        }
 
        if (!vma_is_dax(vma)) {
-               dev_info(dev, "%s: %s: fail, vma is not DAX capable\n",
+               dev_info_ratelimited(dev,
+                               "%s: %s: fail, vma is not DAX capable\n",
                                current->comm, func);
                return -EINVAL;
        }