[xlnx:master 173/199] include/linux/mtd/cfi.h:76:2: sparse: sparse: No CONFIG_MTD_CFI_Ix selected. No NOR chip support can work.

tree:   https://github.com/Xilinx/linux-xlnx master
head:   0a673209eb66ae657980dfab9ef90690647ee344
commit: 3e0fe58e108f56ee9ae5bd107aeb947ab18ef0a2 [173/199] spi: Move update_stripe definition to spi-mem
config: x86_64-randconfig-s021-20200908 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-191-g10164920-dirty
        git checkout 3e0fe58e108f56ee9ae5bd107aeb947ab18ef0a2
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 

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


sparse warnings: (new ones prefixed by >>)

   drivers/spi/spi-mem.c: note: in included file (through include/linux/mtd/spi-nor.h):

quoted

include/linux/mtd/cfi.h:76:2: sparse: sparse: No CONFIG_MTD_CFI_Ix selected. No NOR chip support can work.

   In file included from include/linux/mtd/spi-nor.h:14,
                    from drivers/spi/spi-mem.c:10:
   include/linux/mtd/cfi.h:76:2: warning: #warning No CONFIG_MTD_CFI_Ix selected. No NOR chip support can work. [-Wcpp]
      76 | #warning No CONFIG_MTD_CFI_Ix selected. No NOR chip support can work.
         |  ^~~~~~~
   drivers/spi/spi-mem.o: warning: objtool: spi_mem_exec_op()+0x90: sibling call from callable instruction with modified stack frame

# https://github.com/Xilinx/linux-xlnx/commit/3e0fe58e108f56ee9ae5bd107aeb947ab18ef0a2
git remote add xlnx https://github.com/Xilinx/linux-xlnx
git fetch --no-tags xlnx master
git checkout 3e0fe58e108f56ee9ae5bd107aeb947ab18ef0a2
vim +76 include/linux/mtd/cfi.h

^1da177e4c3f41 Linus Torvalds  2005-04-16  74  
241651d04d672f David Woodhouse 2007-09-06  75  #ifndef cfi_interleave
241651d04d672f David Woodhouse 2007-09-06 @76  #warning No CONFIG_MTD_CFI_Ix selected. No NOR chip support can work.
241651d04d672f David Woodhouse 2007-09-06  77  static inline int cfi_interleave(void *cfi)
241651d04d672f David Woodhouse 2007-09-06  78  {
241651d04d672f David Woodhouse 2007-09-06  79  	BUG();
241651d04d672f David Woodhouse 2007-09-06  80  	return 0;
241651d04d672f David Woodhouse 2007-09-06  81  }
241651d04d672f David Woodhouse 2007-09-06  82  #endif
241651d04d672f David Woodhouse 2007-09-06  83  

:::::: The code at line 76 was first introduced by commit
:::::: 241651d04d672fb685b2874707016cbbf95931e5 [MTD] Fix CFI build error when no map width or interleave supported

:::::: TO: David Woodhouse [off-list ref]
:::::: CC: David Woodhouse [off-list ref]

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