linux-kernel - drivers/platform/surface/surface_aggregator_registry.c:398:25: warning: implicit conversion from 'int' to '__u8' (aka 'unsigned char') changes value from 65535 to 255

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Date:   Fri, 7 May 2021 17:48:09 +0800
From:   kernel test robot <lkp@...el.com>
To:     Maximilian Luz <luzmaximilian@...il.com>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>
Subject: drivers/platform/surface/surface_aggregator_registry.c:398:25:
 warning: implicit conversion from 'int' to '__u8' (aka 'unsigned char')
 changes value from 65535 to 255

Hi Maximilian,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   a48b0872e69428d3d02994dcfad3519f01def7fa
commit: 797e78564634275ed4fe6b3f586c4b96eb1d86bc platform/surface: aggregator_registry: Add base device hub
date:   9 weeks ago
config: arm64-randconfig-r013-20210507 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project a3a8a1a15b524d91b5308db68e9d293b34cd88dd)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=797e78564634275ed4fe6b3f586c4b96eb1d86bc
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 797e78564634275ed4fe6b3f586c4b96eb1d86bc
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm64 

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

All warnings (new ones prefixed by >>):

   In file included from drivers/platform/surface/surface_aggregator_registry.c:12:
   In file included from include/linux/acpi.h:35:
   In file included from include/acpi/acpi_io.h:7:
   In file included from arch/arm64/include/asm/acpi.h:12:
   include/linux/efi.h:1093:34: warning: passing 1-byte aligned argument to 4-byte aligned parameter 2 of 'get_var' may result in an unaligned pointer access [-Walign-mismatch]
           status = get_var(L"SecureBoot", &EFI_GLOBAL_VARIABLE_GUID, NULL, &size,
                                           ^
   include/linux/efi.h:1101:24: warning: passing 1-byte aligned argument to 4-byte aligned parameter 2 of 'get_var' may result in an unaligned pointer access [-Walign-mismatch]
           get_var(L"SetupMode", &EFI_GLOBAL_VARIABLE_GUID, NULL, &size, &setupmode);
                                 ^
>> drivers/platform/surface/surface_aggregator_registry.c:398:25: warning: implicit conversion from 'int' to '__u8' (aka 'unsigned char') changes value from 65535 to 255 [-Wconstant-conversion]
           { SSAM_VDEV(HUB, 0x02, SSAM_ANY_IID, 0x00) },
           ~                      ^~~~~~~~~~~~
   include/linux/surface_aggregator/device.h:71:23: note: expanded from macro 'SSAM_ANY_IID'
   #define SSAM_ANY_IID            0xffff
                                   ^~~~~~
   include/linux/surface_aggregator/device.h:126:63: note: expanded from macro 'SSAM_VDEV'
           SSAM_DEVICE(SSAM_DOMAIN_VIRTUAL, SSAM_VIRTUAL_TC_##cat, tid, iid, fun)
                                                                        ^~~
   include/linux/surface_aggregator/device.h:102:41: note: expanded from macro 'SSAM_DEVICE'
           .instance = ((iid) != SSAM_ANY_IID) ? (iid) : 0,                        \
                                                  ^~~
   3 warnings generated.


vim +398 drivers/platform/surface/surface_aggregator_registry.c

   396	
   397	static const struct ssam_device_id ssam_base_hub_match[] = {
 > 398		{ SSAM_VDEV(HUB, 0x02, SSAM_ANY_IID, 0x00) },
   399		{ },
   400	};
   401	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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