linux-kernel - Re: drivers/net/wireless/intel/iwlwifi/fw/acpi.c:1190:25: warning: '%s' directive argument is null

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Date:   Wed, 08 Nov 2023 17:21:34 -0800 (PST)
From:   Palmer Dabbelt <palmer@...osinc.com>
To:     sunilvl@...tanamicro.com
CC:     lkp@...el.com, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org, ajones@...tanamicro.com,
        Conor Dooley <conor.dooley@...rochip.com>
Subject:     Re: drivers/net/wireless/intel/iwlwifi/fw/acpi.c:1190:25: warning: '%s' directive argument is null

On Wed, 08 Nov 2023 15:23:38 PST (-0800), sunilvl@...tanamicro.com wrote:
> On Sat, Nov 04, 2023 at 06:24:22AM +0800, kernel test robot wrote:
>> Hi Sunil,
>>
>> FYI, the error/warning still remains.
>>
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   e392ea4d4d00880bf94550151b1ace4f88a4b17a
>> commit: a91a9ffbd3a55a0ae1bb75e2b6e85b2a03f64e8f RISC-V: Add support to build the ACPI core
>> date:   5 months ago
>> config: riscv-allyesconfig (https://download.01.org/0day-ci/archive/20231104/202311040602.sCjU3UXr-lkp@intel.com/config)
>> compiler: riscv64-linux-gcc (GCC) 13.2.0
>> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231104/202311040602.sCjU3UXr-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/202311040602.sCjU3UXr-lkp@intel.com/
>>
>> All warnings (new ones prefixed by >>):
>>
>>    In file included from drivers/net/wireless/intel/iwlwifi/fw/acpi.c:9:
>>    drivers/net/wireless/intel/iwlwifi/fw/acpi.c: In function 'iwl_acpi_is_ppag_approved':
>> >> drivers/net/wireless/intel/iwlwifi/fw/acpi.c:1190:25: warning: '%s' directive argument is null [-Wformat-overflow=]
>>     1190 |                         "System vendor '%s' is not in the approved list, disabling PPAG.\n",
>>          |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>    drivers/net/wireless/intel/iwlwifi/iwl-debug.h:91:56: note: in definition of macro '__IWL_DEBUG_DEV'
>>       91 |                 __iwl_dbg(dev, level, limit, __func__, fmt, ##args);    \
>>          |                                                        ^~~
>>    drivers/net/wireless/intel/iwlwifi/iwl-debug.h:209:41: note: in expansion of macro 'IWL_DEBUG'
>>      209 | #define IWL_DEBUG_RADIO(p, f, a...)     IWL_DEBUG(p, IWL_DL_RADIO, f, ## a)
>>          |                                         ^~~~~~~~~
>>    drivers/net/wireless/intel/iwlwifi/fw/acpi.c:1189:17: note: in expansion of macro 'IWL_DEBUG_RADIO'
>>     1189 |                 IWL_DEBUG_RADIO(fwrt,
>>          |                 ^~~~~~~~~~~~~~~
>>    drivers/net/wireless/intel/iwlwifi/fw/acpi.c:1190:41: note: format string is defined here
>>     1190 |                         "System vendor '%s' is not in the approved list, disabling PPAG.\n",
>>          |                                         ^~
>>
>>
>> vim +1190 drivers/net/wireless/intel/iwlwifi/fw/acpi.c
>>
>> e8e10a37c51c08 Matt Chen 2022-03-04  1187
>> e8e10a37c51c08 Matt Chen 2022-03-04  1188  	if (!dmi_check_system(dmi_ppag_approved_list)) {
>> e8e10a37c51c08 Matt Chen 2022-03-04  1189  		IWL_DEBUG_RADIO(fwrt,
>> e8e10a37c51c08 Matt Chen 2022-03-04 @1190  			"System vendor '%s' is not in the approved list, disabling PPAG.\n",
>>
> Hi,
>
> This should be fixed once SMBIOS is enabled in RISC-V. So, can this
> warning be ignored until SMBIOS support is merged for RISC-V?

Maybe we should just have something like this?

diff --git a/drivers/net/wireless/intel/iwlwifi/Kconfig b/drivers/net/wireless/intel/iwlwifi/Kconfig
index 20971304fdef..cbcd1dcced4d 100644
--- a/drivers/net/wireless/intel/iwlwifi/Kconfig
+++ b/drivers/net/wireless/intel/iwlwifi/Kconfig
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 config IWLWIFI
 	tristate "Intel Wireless WiFi Next Gen AGN - Wireless-N/Advanced-N/Ultimate-N (iwlwifi) "
-	depends on PCI && HAS_IOMEM && CFG80211
+	depends on PCI && HAS_IOMEM && CFG80211 && DMI
 	depends on IWLMEI || !IWLMEI
 	select FW_LOADER
 	help

>
> Thanks,
> Sunil
>> :::::: The code at line 1190 was first introduced by commit
>> :::::: e8e10a37c51c08b99d272b2e1b3ef70fcd38f9e8 iwlwifi: acpi: move ppag code from mvm to fw/acpi
>>
>> :::::: TO: Matt Chen <matt.chen@...el.com>
>> :::::: CC: Luca Coelho <luciano.coelho@...el.com>
>>
>> --
>> 0-DAY CI Kernel Test Service
>> https://github.com/intel/lkp-tests/wiki