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Dan Williams 65d3440e8d mm/memory-failure: fix detection of memory_failure() handlers 
Some pagemap types, like MEMORY_DEVICE_GENERIC (device-dax) do not even
have pagemap ops which results in crash signatures like this:

  BUG: kernel NULL pointer dereference, address: 0000000000000010
  #PF: supervisor read access in kernel mode
  #PF: error_code(0x0000) - not-present page
  PGD 8000000205073067 P4D 8000000205073067 PUD 2062b3067 PMD 0
  Oops: 0000 [#1] PREEMPT SMP PTI
  CPU: 22 PID: 4535 Comm: device-dax Tainted: G           OE    N 6.0.0-rc2+ #59
  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
  RIP: 0010:memory_failure+0x667/0xba0
 [..]
  Call Trace:
   <TASK>
   ? _printk+0x58/0x73
   do_madvise.part.0.cold+0xaf/0xc5

Check for ops before checking if the ops have a memory_failure()
handler.

Link: https://lkml.kernel.org/r/166153428781.2758201.1990616683438224741.stgit@dwillia2-xfh.jf.intel.com
Fixes: 33a8f7f2b3 ("pagemap,pmem: introduce ->memory_failure()")
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Shiyang Ruan <ruansy.fnst@fujitsu.com>
Cc: Darrick J. Wong <djwong@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Goldwyn Rodrigues <rgoldwyn@suse.de>
Cc: Jane Chu <jane.chu@oracle.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Ritesh Harjani <riteshh@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2022-09-11 16:22:29 -07:00
..
acpi Merge branch 'acpi-properties' 2022-08-11 19:21:03 +02:00
asm-generic Seventeen hotfixes. Mostly memory management things. Ten patches are 2022-08-28 14:49:59 -07:00
clocksource - Add the missing DT bindings for the MTU nomadik timer (Linus 2022-07-28 12:33:34 +02:00
crypto for-5.20/block-2022-08-04 2022-08-04 20:00:14 -07:00
drm Driver uAPI changes: 2022-07-22 15:51:31 +10:00
dt-bindings power supply and reset changes for the v6.0 series 2022-08-12 09:37:33 -07:00
keys
kunit
kvm
linux mm/memory-failure: fix detection of memory_failure() handlers 2022-09-11 16:22:29 -07:00
math-emu
media SPDX changes for 6.0-rc1 2022-08-04 12:12:54 -07:00
memory
misc
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf 2022-08-24 19:18:10 -07:00
pcmcia
ras mm, hwpoison: enable memory error handling on 1GB hugepage 2022-08-08 18:06:44 -07:00
rdma dma-mapping updates 2022-08-06 10:56:45 -07:00
rv Documentation/rv: Add deterministic automata monitor synthesis documentation 2022-07-30 14:01:29 -04:00
scsi SCSI misc on 20220813 2022-08-13 13:41:48 -07:00
soc net: mscc: ocelot: keep ocelot_stat_layout by reg address, not offset 2022-08-17 21:58:32 -07:00
sound ASoC: More updates for v5.20 2022-08-01 15:26:40 +02:00
target scsi: target: core: De-RCU of se_lun and se_lun acl 2022-08-01 19:36:02 -04:00
trace * Xen timer fixes 2022-08-11 12:10:08 -07:00
uapi io_uring-6.0-2022-08-26 2022-08-26 11:01:52 -07:00
ufs scsi: ufs: core: Enable link lost interrupt 2022-08-11 22:04:32 -04:00
vdso
video
xen x86/xen: Add support for HVMOP_set_evtchn_upcall_vector 2022-08-12 11:28:21 +02:00