linux-kernel - drivers/acpi/x86/apple.c:30:6: warning: no previous declaration for 'acpi_extract_apple

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Date:   Fri, 2 Sep 2022 04:41:11 +0800
From:   kernel test robot <lkp@...el.com>
To:     Lukas Wunner <lukas@...ner.de>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: drivers/acpi/x86/apple.c:30:6: warning: no previous declaration for
 'acpi_extract_apple_properties'

Hi Lukas,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   42e66b1cc3a070671001f8a1e933a80818a192bf
commit: 899596e090ea21918c55cbccea594be840af44ea ACPI / property: Support Apple _DSM properties
date:   5 years ago
config: i386-randconfig-a002 (https://download.01.org/0day-ci/archive/20220902/202209020412.Ts31BZrs-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=899596e090ea21918c55cbccea594be840af44ea
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 899596e090ea21918c55cbccea594be840af44ea
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kernel/cpu/ arch/x86/kvm/ drivers/acpi/ virt/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/acpi/x86/apple.c:30:6: warning: no previous declaration for 'acpi_extract_apple_properties' [-Wmissing-declarations]
    void acpi_extract_apple_properties(struct acpi_device *adev)
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/acpi_extract_apple_properties +30 drivers/acpi/x86/apple.c

    14	
    15	/* Apple _DSM device properties GUID */
    16	static const guid_t apple_prp_guid =
    17		GUID_INIT(0xa0b5b7c6, 0x1318, 0x441c,
    18			  0xb0, 0xc9, 0xfe, 0x69, 0x5e, 0xaf, 0x94, 0x9b);
    19	
    20	/**
    21	 * acpi_extract_apple_properties - retrieve and convert Apple _DSM properties
    22	 * @adev: ACPI device for which to retrieve the properties
    23	 *
    24	 * Invoke Apple's custom _DSM once to check the protocol version and once more
    25	 * to retrieve the properties.  They are marshalled up in a single package as
    26	 * alternating key/value elements, unlike _DSD which stores them as a package
    27	 * of 2-element packages.  Convert to _DSD format and make them available under
    28	 * the primary fwnode.
    29	 */
  > 30	void acpi_extract_apple_properties(struct acpi_device *adev)

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