linux-kernel - [PATCH] acpi: Fix hed module initialization order when it is built-in

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Message-ID: <20241115035014.1339256-1-tanxiaofei@huawei.com>
Date: Fri, 15 Nov 2024 11:50:14 +0800
From: Xiaofei Tan <tanxiaofei@...wei.com>
To: <rafael@...nel.org>, <lenb@...nel.org>
CC: <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<jonathan.cameron@...wei.com>, <M.Chehab@...wei.com>,
	<roberto.sassu@...wei.com>, <shiju.jose@...wei.com>,
	<prime.zeng@...ilicon.com>, <linuxarm@...wei.com>, Xiaofei Tan
	<tanxiaofei@...wei.com>, Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH] acpi: Fix hed module initialization order when it is built-in

When the module hed is built-in, the init order is determined by
Makefile order. That order violates expectations. Because the module
hed init is behind evged. RAS records can't be handled in the
special time window that evged has initialized while hed not.
If the number of such RAS records is more than the APEI HEST error
source number, the HEST resources could be occupied all, and then
could affect subsequent RAS error reporting.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Xiaofei Tan <tanxiaofei@...wei.com>
---
 drivers/acpi/Makefile | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 61ca4afe83dc..54f60b7922ad 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -15,6 +15,13 @@ endif
 
 obj-$(CONFIG_ACPI)		+= tables.o
 
+#
+# The hed.o needs to be in front of evged.o to avoid the problem that
+# RAS errors cannot be handled in the special time window of startup
+# phase that evged has initialized while hed not.
+#
+obj-$(CONFIG_ACPI_HED)		+= hed.o
+
 #
 # ACPI Core Subsystem (Interpreter)
 #
@@ -95,7 +102,6 @@ obj-$(CONFIG_ACPI_HOTPLUG_IOAPIC) += ioapic.o
 obj-$(CONFIG_ACPI_BATTERY)	+= battery.o
 obj-$(CONFIG_ACPI_SBS)		+= sbshc.o
 obj-$(CONFIG_ACPI_SBS)		+= sbs.o
-obj-$(CONFIG_ACPI_HED)		+= hed.o
 obj-$(CONFIG_ACPI_EC_DEBUGFS)	+= ec_sys.o
 obj-$(CONFIG_ACPI_BGRT)		+= bgrt.o
 obj-$(CONFIG_ACPI_CPPC_LIB)	+= cppc_acpi.o
-- 
2.33.0