linux-kernel - Build warning on drivers/acpi/tables.c:399

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Message-ID: <edf62d1b-54c0-4e03-96fa-08048b258bfd@arm.com>
Date: Wed, 23 Apr 2025 12:52:26 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 linux-acpi@...r.kernel.org
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
 Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Build warning on drivers/acpi/tables.c:399

Hello,

Getting the following build warning with native arm64 gcc (Debian 10.2.1-6) 10.2.1
20210110 and with arm64 cross compiler as well.

drivers/acpi/tables.c:399:1: warning: ‘nonstring’ attribute ignored on objects of type ‘const char[][4]’ [-Wattributes]
  399 | static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst __nonstring = {                                                                                                                      
      | ^~~~~~               

This is caused by a recent commit 4b4bd8c50f48 ("gcc-15: acpi: sprinkle random
'__nonstring' crumbles around"). Should that __nonstring attribute for table_sigsp[][]
be dropped off ? Apparently __nonstring attribute only applies for character arrays but
not applicable for arrays of character arrays.

- Anshuman