[v7,0/8] Make ghes_edac a proper module

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.

The proper solution is to make ghes_edac a proper module.

Changelog:
v7:
 - remove the ghes_edac_preferred and ghes_present (suggested by Borislav)
 - adjust the patch splitting, no major functional changes
 - remove the r-b tag in those changed patches
v6:https://www.spinics.net/lists/kernel/msg4511453.html
 - no code changes from v5 patches
 - add the reviewed and acked by from Toshi
 - describe the removal of ghes_edac_force_enable checking in Patch 05
v5: https://www.spinics.net/lists/kernel/msg4502787.html
 - add the review-by from Toshi for patch 04 and 06
 - refine the commit msg
 - remove the unconditional set of ghes_edac_force_enable on Arm
v4: https://lore.kernel.org/lkml/20220831074027.13849-6-justin.he@arm.com/
 - move the kernel boot option to ghes module parameter
 - collapse th ghes_present and ghes_edac_preferred into one patch
v3: https://lore.kernel.org/lkml/20220822154048.188253-1-justin.he@arm.com/
 - 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
v2: https://lore.kernel.org/lkml/20220817143458.335938-1-justin.he@arm.com/
 - 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
v1: https://lore.kernel.org/lkml/20220811091713.10427-1-justin.he@arm.com/

Jia He (8):
  efi/cper: export several helpers for ghes_edac to use
  EDAC/ghes: Add a notifier for reporting memory errors
  EDAC:ghes: Move ghes_edac.force_load to ghes module parameter
  ghes: Introduce a helper ghes_get_devices()
  EDAC/ghes: Make ghes_edac a proper module to remove the dependency on
    ghes
  EDAC: Add the ghes_get_devices() check for chipset-specific edac
    drivers
  apei/ghes: Use unrcu_pointer for cmpxchg
  EDAC/igen6: Return consistent errno when another edac driver is
    enabled

 drivers/acpi/apei/ghes.c       | 70 +++++++++++++++++++++++++---
 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       | 83 ++++++++++++++++++++++------------
 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/apei.h            |  2 +
 include/acpi/ghes.h            | 34 ++++----------
 17 files changed, 166 insertions(+), 63 deletions(-)