• Jan Beulich's avatar
    procfs: also fix proc_reg_get_unmapped_area() for !MMU case · ae5758a1
    Jan Beulich authored
    Commit fad1a86e ("procfs: call default get_unmapped_area on
    MMU-present architectures"), as its title says, took care of only the
    MMU case, leaving the !MMU side still in the regressed state (returning
    -EIO in all cases where pde->proc_fops->get_unmapped_area is NULL).
    From the fad1a86e changelog:
     "Commit c4fe2448
     ("sparc: fix PCI device proc file mmap(2)") added
      proc_reg_get_unmapped_area in proc_reg_file_ops and
      proc_reg_file_ops_no_compat, by which now mmap always returns EIO if
      get_unmapped_area method is not defined for the target procfs file, which
      causes regression of mmap on /proc/vmcore.
      To address this issue, like get_unmapped_area(), call default
      current->mm->get_unmapped_area on MMU-present architectures if
      pde->proc_fops->get_unmapped_area, i.e.  the one in actual file operation
      in the procfs file, is not defined"
    Signed-off-by: default avatarJan Beulich <jbeulich@suse.com>
    Cc: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
    Cc: Alexey Dobriyan <adobriyan@gmail.com>
    Cc: David S. Miller <davem@davemloft.net>
    Cc: <stable@vger.kernel.org>	[3.12.x]
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>