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Date:   Sun, 15 Oct 2023 09:03:18 +0200
From:   Sergio Paracuellos <sergio.paracuellos@...il.com>
To:     kernel test robot <lkp@...el.com>
Cc:     llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Subject: Re: drivers/clk/ralink/clk-mtmips.c:821:34: warning: unused variable 'mtmips_of_match'

Hi,

On Sat, Oct 14, 2023 at 9:25 PM kernel test robot <lkp@...el.com> wrote:
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   70f8c6f8f8800d970b10676cceae42bba51a4899
> commit: 6f3b15586eef736831abe6a14f2a6906bc0dc074 clk: ralink: add clock and reset driver for MTMIPS SoCs
> date:   4 months ago
> config: hexagon-randconfig-r016-20230817 (https://download.01.org/0day-ci/archive/20231015/202310150352.KyKovpbT-lkp@intel.com/config)
> compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231015/202310150352.KyKovpbT-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/202310150352.KyKovpbT-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):
>
>    In file included from drivers/clk/ralink/clk-mtmips.c:11:
>    In file included from include/linux/regmap.h:20:
>    In file included from include/linux/iopoll.h:14:
>    In file included from include/linux/io.h:13:
>    In file included from arch/hexagon/include/asm/io.h:334:
>    include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
>            val = __raw_readb(PCI_IOBASE + addr);
>                              ~~~~~~~~~~ ^
>    include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
>            val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
>                                                            ~~~~~~~~~~ ^
>    include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
>    #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
>                                                      ^
>    In file included from drivers/clk/ralink/clk-mtmips.c:11:
>    In file included from include/linux/regmap.h:20:
>    In file included from include/linux/iopoll.h:14:
>    In file included from include/linux/io.h:13:
>    In file included from arch/hexagon/include/asm/io.h:334:
>    include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
>            val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
>                                                            ~~~~~~~~~~ ^
>    include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
>    #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
>                                                      ^
>    In file included from drivers/clk/ralink/clk-mtmips.c:11:
>    In file included from include/linux/regmap.h:20:
>    In file included from include/linux/iopoll.h:14:
>    In file included from include/linux/io.h:13:
>    In file included from arch/hexagon/include/asm/io.h:334:
>    include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
>            __raw_writeb(value, PCI_IOBASE + addr);
>                                ~~~~~~~~~~ ^
>    include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
>            __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
>                                                          ~~~~~~~~~~ ^
>    include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
>            __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
>                                                          ~~~~~~~~~~ ^
>    drivers/clk/ralink/clk-mtmips.c:309:9: warning: variable 'ret' is uninitialized when used here [-Wuninitialized]
>            return ret;
>                   ^~~
>    drivers/clk/ralink/clk-mtmips.c:285:9: note: initialize the variable 'ret' to silence this warning
>            int ret, i;
>                   ^
>                    = 0
>    drivers/clk/ralink/clk-mtmips.c:359:9: warning: variable 'ret' is uninitialized when used here [-Wuninitialized]
>            return ret;
>                   ^~~
>    drivers/clk/ralink/clk-mtmips.c:335:9: note: initialize the variable 'ret' to silence this warning
>            int ret, i;
>                   ^
>                    = 0
> >> drivers/clk/ralink/clk-mtmips.c:821:34: warning: unused variable 'mtmips_of_match' [-Wunused-const-variable]
>    static const struct of_device_id mtmips_of_match[] = {
>                                     ^
>    9 warnings generated.

I already sent this patch some time ago and still waiting for its review:

https://lore.kernel.org/lkml/20230827023932.501102-1-sergio.paracuellos@gmail.com/t/

[snip]

Thanks,
    Sergio Paracuellos

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