[xlnx:xlnx_rebase_v5.4 458/1765] drivers/media/platform/xilinx/xilinx-multi-scaler.c:361:18: warning: passing argument 1 of 'ioread32' discards 'const' qualifier from pointer target type

Hi Suresh,

FYI, the error/warning still remains.

tree:   https://github.com/Xilinx/linux-xlnx xlnx_rebase_v5.4
head:   2f686fa6c0bf7fa168dc45dd7ce1359217212911
commit: 31ff947476b863c4f59eb26baa654631e7b05a7b [458/1765] v4l: xilinx-multi-scaler: Remove volatile
config: x86_64-allyesconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/Xilinx/linux-xlnx/commit/31ff947476b863c4f59eb26baa654631e7b05a7b
        git remote add xlnx https://github.com/Xilinx/linux-xlnx
        git fetch --no-tags xlnx xlnx_rebase_v5.4
        git checkout 31ff947476b863c4f59eb26baa654631e7b05a7b
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All warnings (new ones prefixed by >>):

   drivers/media/platform/xilinx/xilinx-multi-scaler.c: In function 'xm2msc_readreg':

quoted

drivers/media/platform/xilinx/xilinx-multi-scaler.c:361:18: warning: passing argument 1 of 'ioread32' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]

     361 |  return ioread32(addr);
         |                  ^~~~
   In file included from arch/x86/include/asm/io.h:229,
                    from arch/x86/include/asm/realmode.h:15,
                    from arch/x86/include/asm/acpi.h:16,
                    from arch/x86/include/asm/fixmap.h:29,
                    from arch/x86/include/asm/apic.h:11,
                    from arch/x86/include/asm/smp.h:13,
                    from arch/x86/include/asm/mmzone_64.h:11,
                    from arch/x86/include/asm/mmzone.h:5,
                    from include/linux/mmzone.h:972,
                    from include/linux/gfp.h:6,
                    from include/linux/xarray.h:14,
                    from include/linux/radix-tree.h:18,
                    from include/linux/fs.h:15,
                    from drivers/media/platform/xilinx/xilinx-multi-scaler.c:16:
   include/asm-generic/iomap.h:32:30: note: expected 'void *' but argument is of type 'const void *'
      32 | extern unsigned int ioread32(void __iomem *);
         |                              ^~~~~~~~~~~~~~


vim +361 drivers/media/platform/xilinx/xilinx-multi-scaler.c

f5d1fac4b3ef01 Suresh Gupta 2018-09-17  358  
31ff947476b863 Suresh Gupta 2018-10-12  359  static inline u32 xm2msc_readreg(const void __iomem *addr)
f5d1fac4b3ef01 Suresh Gupta 2018-09-17  360  {
f5d1fac4b3ef01 Suresh Gupta 2018-09-17 @361  	return ioread32(addr);
f5d1fac4b3ef01 Suresh Gupta 2018-09-17  362  }
f5d1fac4b3ef01 Suresh Gupta 2018-09-17  363  

:::::: The code at line 361 was first introduced by commit
:::::: f5d1fac4b3ef01a4f9a489e9be9a65964a5baf57 platform: xilinx: Add mem to mem Multi-Scaler driver (XM2MSC)

:::::: TO: Suresh Gupta [off-list ref]
:::::: CC: Michal Simek [off-list ref]

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