linux-kernel - [PATCH] ACPI / scan: Add static attribute to indirect_io

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Date:   Tue, 7 Aug 2018 21:15:05 +0800
From:   John Garry <john.garry@...wei.com>
To:     <rjw@...ysocki.net>, <lenb@...nel.org>, <hdegoede@...hat.com>
CC:     <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>, John Garry <john.garry@...wei.com>
Subject: [PATCH] ACPI / scan: Add static attribute to indirect_io_hosts[]

Array indirect_io_hosts[] is declared in acpi_is_indirect_io_slave() as a
const array, which means that the array will be re-built for each call.

Optimise by adding the static attribute, which means that the array is
added to const-data pool and not re-built per function call.

Reported-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: John Garry <john.garry@...wei.com>

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 970dd87..199c8ea6 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1528,7 +1528,7 @@ static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
 static bool acpi_is_indirect_io_slave(struct acpi_device *device)
 {
 	struct acpi_device *parent = device->parent;
-	const struct acpi_device_id indirect_io_hosts[] = {
+	static const struct acpi_device_id indirect_io_hosts[] = {
 		{"HISI0191", 0},
 		{}
 	};
-- 
1.9.1