[PATCH v2 0/6] remove dead NULL checks after GFP_NOFAIL allocations and fix xive use-after-free

Changes in v2:
- Remove the now-unused out_free_domain error label in the xive
  patch after deleting the unreachable NULL check goto.
- Fix a use-after-free of xive_ipis: when xive_init_ipis() fails,
  the error path frees xive_ipis but xive_smp_probe() ignores the
  error and proceeds to dereference it in xive_setup_cpu_ipi().
  Propagate the error return through xive_smp_probe() and check
  it in both pnv_smp_probe() and pSeries_smp_probe().

This is a code cleanup series that removes unreachable
NULL checks (and associated error handling) that follow allocations
using __GFP_NOFAIL, which guarantees non-NULL return.

Gou Hao (6):
  powerpc/xive: remove dead NULL check after GFP_NOFAIL allocation
  powerpc/xive: add error return value to xive_smp_probe()
  powerpc/xive: fix use-after-free of xive_ipis
  drm: remove dead WARN_ON NULL check after GFP_NOFAIL allocation
  lib/test_hmm: remove dead NULL checks after GFP_NOFAIL allocations
  RDMA/cxgb4: remove dead NULL checks after GFP_NOFAIL allocations

 arch/powerpc/include/asm/xive.h      |  4 ++--
 arch/powerpc/platforms/powernv/smp.c |  8 +++++---
 arch/powerpc/platforms/pseries/smp.c |  8 +++++---
 arch/powerpc/sysdev/xive/common.c    | 15 +++++++++------
 drivers/gpu/drm/drm_modeset_lock.c   |  4 ----
 drivers/infiniband/hw/cxgb4/mem.c    | 10 ++--------
 lib/test_hmm.c                       |  6 ------
 7 files changed, 23 insertions(+), 32 deletions(-)

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2.20.1