Pull arm64 fixes from Will Deacon:
 "This addresses some problems with filesystem writeback due to the
  recently merged hardware DBM patches, which caused us to treat some
  read-only pages as dirty.

  There are also some other, less significant fixes that are described
  in the summary below:

  A mixture of fixes for regressions introduced during the merge window,
  some longer standing problems that we spotted and a couple of hardware
  errata.  The main changes are:

   - Fix fallout from the h/w DBM patches, causing filesystem writeback
     issues on both v8 and v8.1 CPUs

   - Workaround for Cortex-A53 erratum #843419 in the module loader

   - Fix for long-standing issue with compat big-endian signal handlers
     using the saved floating point state"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: errata: add module build workaround for erratum #843419
  arm64: compat: fix vfp save/restore across signal handlers in big-endian
  arm64: cpu hotplug: ensure we mask out CPU_TASKS_FROZEN in notifiers
  arm64: head.S: initialise mdcr_el2 in el2_setup
  arm64: enable generic idle loop
  arm64: pgtable: use a single bit for PTE_WRITE regardless of DBM
  arm64: Fix pte_modify() to preserve the hardware dirty information
  arm64: Fix the pte_hw_dirty() check when AF/DBM is enabled
  arm64: dma-mapping: check whether cma area is initialized or not