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Groups > linux.kernel > #1715410

[PATCH v3 4/5] EDAC: add edac_get_owner() to check MC owner

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Only a single edac driver can be enabled for EDAC MC.  When ghes_edac
is enabled, a regular edac driver for the CPU type / platform still
attempts to register itself and fails in edac_mc_add_mc().

Add edac_get_owner() so that regular edac drivers can check the owner
of EDAC MC without calling edac_mc_add_mc().

Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Suggested-by: Borislav Petkov <bp@alien8.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Tony Luck <tony.luck@intel.com>
---
 drivers/edac/edac_mc.c |    7 ++++++-
 drivers/edac/edac_mc.h |    8 ++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index 4800721..48193f5 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -53,7 +53,7 @@ static LIST_HEAD(mc_devices);
  * Used to lock EDAC MC to just one module, avoiding two drivers e. g.
  *	apei/ghes and i7core_edac to be used at the same time.
  */
-static void const *edac_mc_owner;
+static const char *edac_mc_owner;
 
 static struct bus_type mc_bus[EDAC_MAX_MCS];
 
@@ -701,6 +701,11 @@ struct mem_ctl_info *edac_mc_find(int idx)
 }
 EXPORT_SYMBOL(edac_mc_find);
 
+const char *edac_get_owner(void)
+{
+	return edac_mc_owner;
+}
+EXPORT_SYMBOL_GPL(edac_get_owner);
 
 /* FIXME - should a warning be printed if no error detection? correction? */
 int edac_mc_add_mc_with_groups(struct mem_ctl_info *mci,
diff --git a/drivers/edac/edac_mc.h b/drivers/edac/edac_mc.h
index 5357800..4165e15 100644
--- a/drivers/edac/edac_mc.h
+++ b/drivers/edac/edac_mc.h
@@ -128,6 +128,14 @@ struct mem_ctl_info *edac_mc_alloc(unsigned mc_num,
 				   unsigned sz_pvt);
 
 /**
+ * edac_get_owner - Return the owner's mod_name of EDAC MC
+ *
+ * Returns:
+ *	Pointer to mod_name string when EDAC MC is owned. NULL otherwise.
+ */
+extern const char *edac_get_owner(void);
+
+/*
  * edac_mc_add_mc_with_groups() - Insert the @mci structure into the mci
  *	global list and create sysfs entries associated with @mci structure.
  *

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[PATCH v3 0/5] enable ghes_edac on selected platforms Toshi Kani <toshi.kani@hpe.com> - 2017-08-18 22:00 +0200
  [PATCH v3 1/5] ACPI / blacklist: add acpi_match_platform_list() Toshi Kani <toshi.kani@hpe.com> - 2017-08-18 22:00 +0200
    Re: [PATCH v3 1/5] ACPI / blacklist: add acpi_match_platform_list() Borislav Petkov <bp@alien8.de> - 2017-08-21 13:30 +0200
      Re: [PATCH v3 1/5] ACPI / blacklist: add acpi_match_platform_list() "Rafael J. Wysocki" <rafael@kernel.org> - 2017-08-21 14:30 +0200
        [PATCH] ACPICA: Check whether ACPI is disabled before getting a table Borislav Petkov <bp@alien8.de> - 2017-08-21 15:30 +0200
          Re: [PATCH] ACPICA: Check whether ACPI is disabled before getting a table "Rafael J. Wysocki" <rafael@kernel.org> - 2017-08-21 15:40 +0200
            Re: [PATCH] ACPICA: Check whether ACPI is disabled before getting a  table Borislav Petkov <bp@alien8.de> - 2017-08-21 17:40 +0200
      Re: [PATCH v3 1/5] ACPI / blacklist: add acpi_match_platform_list() "Kani, Toshimitsu" <toshi.kani@hpe.com> - 2017-08-21 18:50 +0200
        Re: [PATCH v3 1/5] ACPI / blacklist: add acpi_match_platform_list() Borislav Petkov <bp@alien8.de> - 2017-08-21 19:10 +0200
          Re: [PATCH v3 1/5] ACPI / blacklist: add acpi_match_platform_list() "Kani, Toshimitsu" <toshi.kani@hpe.com> - 2017-08-21 19:30 +0200
            Re: [PATCH v3 1/5] ACPI / blacklist: add acpi_match_platform_list() Borislav Petkov <bp@alien8.de> - 2017-08-21 19:40 +0200
              Re: [PATCH v3 1/5] ACPI / blacklist: add acpi_match_platform_list() "Rafael J. Wysocki" <rafael@kernel.org> - 2017-08-21 22:40 +0200
                Re: [PATCH v3 1/5] ACPI / blacklist: add acpi_match_platform_list() "Kani, Toshimitsu" <toshi.kani@hpe.com> - 2017-08-21 23:10 +0200
                Re: [PATCH v3 1/5] ACPI / blacklist: add acpi_match_platform_list() "Rafael J. Wysocki" <rafael@kernel.org> - 2017-08-21 23:50 +0200
                Re: [PATCH v3 1/5] ACPI / blacklist: add acpi_match_platform_list() "Kani, Toshimitsu" <toshi.kani@hpe.com> - 2017-08-22 00:30 +0200
                Re: [PATCH v3 1/5] ACPI / blacklist: add acpi_match_platform_list() "Rafael J. Wysocki" <rafael@kernel.org> - 2017-08-22 00:30 +0200
  [PATCH v3 4/5] EDAC: add edac_get_owner() to check MC owner Toshi Kani <toshi.kani@hpe.com> - 2017-08-18 22:00 +0200
  [PATCH v3 5/5] edac drivers: add MC owner check in init Toshi Kani <toshi.kani@hpe.com> - 2017-08-18 22:00 +0200
  [PATCH v3 2/5] intel_pstate: convert to use acpi_match_platform_list() Toshi Kani <toshi.kani@hpe.com> - 2017-08-18 22:00 +0200
    Re: [PATCH v3 2/5] intel_pstate: convert to use  acpi_match_platform_list() Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2017-08-21 20:00 +0200
    Re: [PATCH v3 2/5] intel_pstate: convert to use  acpi_match_platform_list() Borislav Petkov <bp@alien8.de> - 2017-08-23 17:50 +0200
      Re: [PATCH v3 2/5] intel_pstate: convert to use  acpi_match_platform_list() "Kani, Toshimitsu" <toshi.kani@hpe.com> - 2017-08-23 18:00 +0200
  [PATCH v3 3/5] ghes_edac: add platform check to enable ghes_edac Toshi Kani <toshi.kani@hpe.com> - 2017-08-18 22:00 +0200
    Re: [PATCH v3 3/5] ghes_edac: add platform check to enable ghes_edac Borislav Petkov <bp@alien8.de> - 2017-08-23 18:30 +0200
      Re: [PATCH v3 3/5] ghes_edac: add platform check to enable ghes_edac "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-08-23 23:00 +0200
        Re: [PATCH v3 3/5] ghes_edac: add platform check to enable ghes_edac Borislav Petkov <bp@alien8.de> - 2017-08-24 10:00 +0200

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