linux-kernel - [PATCH] acpi: blacklist: fix clang warning for unused dmi table

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Message-Id: <20190710130555.1829974-1-arnd@arndb.de>
Date:   Wed, 10 Jul 2019 15:05:43 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: [PATCH] acpi: blacklist: fix clang warning for unused dmi table

When CONFIG_DMI is disabled, we only have a tentative declaration,
which causes a warning from clang:

drivers/acpi/blacklist.c:20:35: error: tentative array definition assumed to have one element [-Werror]
static const struct dmi_system_id acpi_rev_dmi_table[] __initconst;

As the variable is not actually used here, hide it entirely
in an #ifdef to shut up the warning.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/acpi/blacklist.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/acpi/blacklist.c b/drivers/acpi/blacklist.c
index ad2c565f5cbe..a86a770c9b79 100644
--- a/drivers/acpi/blacklist.c
+++ b/drivers/acpi/blacklist.c
@@ -17,7 +17,9 @@
 
 #include "internal.h"
 
+#ifdef CONFIG_DMI
 static const struct dmi_system_id acpi_rev_dmi_table[] __initconst;
+#endif
 
 /*
  * POLICY: If *anything* doesn't work, put it on the blacklist.
@@ -61,7 +63,9 @@ int __init acpi_blacklisted(void)
 	}
 
 	(void)early_acpi_osi_init();
+#ifdef CONFIG_DMI
 	dmi_check_system(acpi_rev_dmi_table);
+#endif
 
 	return blacklisted;
 }
-- 
2.20.0