linux-kernel - Re: drivers/firmware/qcom/qcom_scm.c:1652:34: warning: unused variable 'qcom_scm_qseecom

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Date:   Mon, 20 Nov 2023 20:37:43 +0100
From:   Maximilian Luz <luzmaximilian@...il.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>
Cc:     llvm@...ts.linux.dev,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kernel test robot <lkp@...el.com>
Subject: Re: drivers/firmware/qcom/qcom_scm.c:1652:34: warning: unused
 variable 'qcom_scm_qseecom_allowlist'

On 11/20/23 19:51, Krzysztof Kozlowski wrote:
> On 20/11/2023 19:19, Maximilian Luz wrote:
>>
>>
>> On 11/19/23 10:13, kernel test robot wrote:
>>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>>> head:   037266a5f7239ead1530266f7d7af153d2a867fa
>>> commit: bdac188ec3c71800dd8419620224ee74ef37732a firmware: qcom: move Qualcomm code into its own directory
>>> date:   4 weeks ago
>>> config: s390-randconfig-002-20231119 (https://download.01.org/0day-ci/archive/20231119/202311191654.S4wlVUrz-lkp@intel.com/config)
>>> compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
>>> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231119/202311191654.S4wlVUrz-lkp@intel.com/reproduce)
>>>
>>> If you fix the issue in a separate patch/commit (i.e. not just a new version of
>>> the same patch/commit), kindly add following tags
>>> | Reported-by: kernel test robot <lkp@...el.com>
>>> | Closes: https://lore.kernel.org/oe-kbuild-all/202311191654.S4wlVUrz-lkp@intel.com/
>>>
>>> All warnings (new ones prefixed by >>):
>>
>> [...]
>>
>>>>> drivers/firmware/qcom/qcom_scm.c:1652:34: warning: unused variable 'qcom_scm_qseecom_allowlist' [-Wunused-const-variable]
>>>       1652 | static const struct of_device_id qcom_scm_qseecom_allowlist[] = {
>>>            |                                  ^
>>
>> Any ideas why this is supposedly unused? It should be accessed through
>> qcom_scm_qseecom_init() and qcom_scm_qseecom_machine_is_allowed().
>> Especially if CONFIG_QCOM_QSEECOM=y.
> 
> And in other cases? The bot reports specific failure on specific config.
> You have the config for this arch attached, so you can investigate.

Ah I see now. It's because of_match_node() is defined as macro if !OF
and not as function. I had assumed it's a regular (potentially empty)
function in either case, sorry.
  
> Anyway, short look at the code indeed tells it is unused. It's not
> referenced anywhere except of_match_node(). I can fix this.

Thanks for the fix.

Best regards,
Max