linux-kernel - [PATCH v4 3/8] EDAC:ghes: Move ghes_edac.force

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Date:   Wed, 31 Aug 2022 07:40:22 +0000
From:   Jia He <justin.he@....com>
To:     Len Brown <lenb@...nel.org>, James Morse <james.morse@....com>,
        Tony Luck <tony.luck@...el.com>,
        Borislav Petkov <bp@...en8.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Robert Richter <rric@...nel.org>,
        Robert Moore <robert.moore@...el.com>,
        Qiuxu Zhuo <qiuxu.zhuo@...el.com>,
        Yazen Ghannam <yazen.ghannam@....com>,
        Jan Luebbe <jlu@...gutronix.de>,
        Khuong Dinh <khuong@...amperecomputing.com>,
        Kani Toshi <toshi.kani@....com>
Cc:     Ard Biesheuvel <ardb@...nel.org>, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-edac@...r.kernel.org,
        devel@...ica.org, "Rafael J . Wysocki" <rafael@...nel.org>,
        Shuai Xue <xueshuai@...ux.alibaba.com>,
        Jarkko Sakkinen <jarkko@...nel.org>, linux-efi@...r.kernel.org,
        nd@....com, Jia He <justin.he@....com>
Subject: [PATCH v4 3/8] EDAC:ghes: Move ghes_edac.force_load to ghes module parameter

ghes_edac_init() is too late to set this module flag ghes_edac.force_load.
Also, other edac drivers should not be able to control this flag.

Move this flag to the module parameter in ghes instead.

Suggested-by: Toshi Kani <toshi.kani@....com>
Signed-off-by: Jia He <justin.he@....com>
---
 drivers/acpi/apei/ghes.c | 11 +++++++++++
 drivers/edac/ghes_edac.c | 10 +++-------
 include/acpi/apei.h      |  2 ++
 3 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 8cb65f757d06..6bc9c78f916b 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -109,6 +109,14 @@ static inline bool is_hest_type_generic_v2(struct ghes *ghes)
 bool ghes_disable;
 module_param_named(disable, ghes_disable, bool, 0);
 
+/*
+ * "ghes.edac_force_load" forcibly loads ghes_edac and skips the platform
+ * check.
+ */
+bool ghes_edac_force_load;
+module_param_named(edac_force_load, ghes_edac_force_load, bool, 0);
+EXPORT_SYMBOL(ghes_edac_force_load);
+
 /*
  * All error sources notified with HED (Hardware Error Device) share a
  * single notifier callback, so they need to be linked and checked one
@@ -1483,6 +1491,9 @@ void __init acpi_ghes_init(void)
 		return;
 	}
 
+	if (!IS_ENABLED(CONFIG_X86))
+		ghes_edac_force_load = true;
+
 	ghes_nmi_init_cxt();
 
 	rc = platform_driver_register(&ghes_platform_driver);
diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c
index 7b8d56a769f6..f716d5d8f1df 100644
--- a/drivers/edac/ghes_edac.c
+++ b/drivers/edac/ghes_edac.c
@@ -54,10 +54,6 @@ static DEFINE_MUTEX(ghes_reg_mutex);
  */
 static DEFINE_SPINLOCK(ghes_lock);
 
-/* "ghes_edac.force_load=1" skips the platform check */
-static bool __read_mostly force_load;
-module_param(force_load, bool, 0);
-
 static bool system_scanned;
 
 /* Memory Device - Type 17 of SMBIOS spec */
@@ -408,10 +404,10 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev)
 	if (IS_ENABLED(CONFIG_X86)) {
 		/* Check if safe to enable on this system */
 		idx = acpi_match_platform_list(plat_list);
-		if (!force_load && idx < 0)
+		if (!ghes_edac_force_load && idx < 0)
 			return -ENODEV;
 	} else {
-		force_load = true;
+		ghes_edac_force_load = true;
 		idx = 0;
 	}
 
@@ -535,7 +531,7 @@ void ghes_edac_unregister(struct ghes *ghes)
 	struct mem_ctl_info *mci;
 	unsigned long flags;
 
-	if (!force_load)
+	if (!ghes_edac_force_load)
 		return;
 
 	mutex_lock(&ghes_reg_mutex);
diff --git a/include/acpi/apei.h b/include/acpi/apei.h
index dc60f7db5524..356bdf4bb66e 100644
--- a/include/acpi/apei.h
+++ b/include/acpi/apei.h
@@ -27,9 +27,11 @@ extern int hest_disable;
 extern int erst_disable;
 #ifdef CONFIG_ACPI_APEI_GHES
 extern bool ghes_disable;
+extern bool ghes_edac_force_load;
 void __init acpi_ghes_init(void);
 #else
 #define ghes_disable 1
+#define ghes_edac_force_load 0
 static inline void acpi_ghes_init(void) { }
 #endif
 
-- 
2.25.1