mm/memory: also print a_ops->readpage in print_bad_pte()
mm/memory: also print a_ops->readpage in print_bad_pte()

A lot of filesystems use generic_file_mmap() and filemap_fault(),
f_op->mmap and vm_ops->fault aren't enough to identify filesystem.

This prints file name, vm_ops->fault, f_op->mmap and a_ops->readpage
(which is almost always implemented and filesystem-specific).

Example:

[   23.676410] BUG: Bad page map in process sh  pte:1b7e6025 pmd:19bbd067
[   23.676887] page:ffffea00006df980 count:4 mapcount:1 mapping:ffff8800196426c0 index:0x97
[   23.677481] flags: 0x10000000000000c(referenced|uptodate)
[   23.677896] page dumped because: bad pte
[   23.678205] addr:00007f52fcb17000 vm_flags:00000075 anon_vma:          (null) mapping:ffff8800196426c0 index:97
[   23.678922] file:libc-2.19.so fault:filemap_fault mmap:generic_file_readonly_mmap readpage:v9fs_vfs_readpage

[5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org: use pr_alert, per Kirill]
Signed-off-by: Konstantin Khlebnikov <3b96b99f19643d33e1bfa1caa535c041c3608549@yandex-team.ru>
Cc: Sasha Levin <e642b69ed2fc111e09ffdc37feb733a52253340d@oracle.com>
Acked-by: Kirill A. Shutemov <9b153e80bc985b32d577460a8a24e398d4182978@shutemov.name>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs