[PATCH v3 0/9] Make ghes_edac a proper module

[Jia He]

Commit dc4e8c07e9e2 ("ACPI: APEI: explicit init of HEST and GHES in
apci_init()") introduced a bug that ghes_edac_register() would be invoked
before edac_init(). Because at that time, the bus "edac" hasn't been even
registered, this created sysfs /devices/mc0 instead of
/sys/devices/system/edac/mc/mc0 on an Ampere eMag server.

Changelog:
v3:
 - refine the commit logs
 - introduce ghes preferred and present flag (by Toshi)
 - move force_load to setup parameter
 - add the ghes_edac_preferred() check for x86/Arm edac drivers (incompleted list)
 
v2:
 - add acked-by tag of Patch 1 from Ard
 - split the notifier patch
 - add 2 patch to get regular drivers selected when ghes edac is not loaded
 - fix an errno in igen6 driver
 - add a patch to fix the sparse warning of ghes
 - refine the commit logs

Jia He (9):
  efi/cper: export several helpers for ghes_edac to use
  EDAC/ghes: Add a notifier for reporting memory errors
  EDAC/ghes: Make ghes_edac a proper module to remove the dependency on
    ghes
  EDAC/ghes: Move ghes_edac.force_load to setup parameter
  EDAC: Don't load chipset-specific edac drivers when ghes_edac is
    preferred
  ghes: Introduce a flag ghes_present
  apei/ghes: Use unrcu_pointer for cmpxchg
  EDAC/igen6: Keep returned errno consistent when edac mc has been
    enabled
  edac: Don't load Arm specific edac drivers when ghes_edac is preferred

 .../admin-guide/kernel-parameters.txt         |   5 +
 drivers/acpi/apei/ghes.c                      |  94 ++++++++++++++--
 drivers/edac/Kconfig                          |   4 +-
 drivers/edac/amd64_edac.c                     |   3 +
 drivers/edac/armada_xp_edac.c                 |   3 +
 drivers/edac/edac_module.h                    |   1 +
 drivers/edac/ghes_edac.c                      | 102 +++++++++++-------
 drivers/edac/i10nm_base.c                     |   3 +
 drivers/edac/igen6_edac.c                     |   5 +-
 drivers/edac/layerscape_edac.c                |   3 +
 drivers/edac/pnd2_edac.c                      |   3 +
 drivers/edac/sb_edac.c                        |   3 +
 drivers/edac/skx_base.c                       |   3 +
 drivers/edac/thunderx_edac.c                  |   3 +
 drivers/edac/xgene_edac.c                     |   3 +
 drivers/firmware/efi/cper.c                   |   3 +
 include/acpi/ghes.h                           |  38 +++----
 17 files changed, 204 insertions(+), 75 deletions(-)

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2.25.1