[powerpc:next-test 8/8] arch/powerpc/lib/feature-fixups.c:304:30: error: cast to smaller integer type 'enum l1d_flush_type' from 'void *'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git 
next-test
head:   a5014a5c936a2a9a223e699e1f3abd54d5f68d2c
commit: a5014a5c936a2a9a223e699e1f3abd54d5f68d2c [8/8] powerpc/64s: Fix crashes 
when toggling entry flush barrier
config: powerpc-randconfig-r022-20210503 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 
8f5a2a5836cc8e4c1def2bdeb022e7b496623439)
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 powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # 
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=a5014a5c936a2a9a223e699e1f3abd54d5f68d2c
        git remote add powerpc 
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git
        git fetch --no-tags powerpc next-test
        git checkout a5014a5c936a2a9a223e699e1f3abd54d5f68d2c
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 
ARCH=powerpc 

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

All errors (new ones prefixed by >>):

   arch/powerpc/lib/feature-fixups.c:233:32: error: cast to smaller integer 
type 'enum stf_barrier_type' from 'void *' [-Werror,-Wvoid-pointer-to-enum-cast]
           enum stf_barrier_type types = (enum stf_barrier_type)data;
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~
>> arch/powerpc/lib/feature-fixups.c:304:30: error: cast to smaller integer 
>> type 'enum l1d_flush_type' from 'void *' 
>> [-Werror,-Wvoid-pointer-to-enum-cast]
           enum l1d_flush_type types = (enum l1d_flush_type)data;
                                       ^~~~~~~~~~~~~~~~~~~~~~~~~
   2 errors generated.


vim +304 arch/powerpc/lib/feature-fixups.c

   301  
   302  static int __do_entry_flush_fixups(void *data)
   303  {
 > 304          enum l1d_flush_type types = (enum l1d_flush_type)data;
   305          unsigned int instrs[3], *dest;
   306          long *start, *end;
   307          int i;
   308  
   309          instrs[0] = 0x60000000; /* nop */
   310          instrs[1] = 0x60000000; /* nop */
   311          instrs[2] = 0x60000000; /* nop */
   312  
   313          i = 0;
   314          if (types == L1D_FLUSH_FALLBACK) {
   315                  instrs[i++] = 0x7d4802a6; /* mflr r10           */
   316                  instrs[i++] = 0x60000000; /* branch patched below */
   317                  instrs[i++] = 0x7d4803a6; /* mtlr r10           */
   318          }
   319  
   320          if (types & L1D_FLUSH_ORI) {
   321                  instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation 
barrier */
   322                  instrs[i++] = 0x63de0000; /* ori 30,30,0 L1d flush*/
   323          }
   324  
   325          if (types & L1D_FLUSH_MTTRIG)
   326                  instrs[i++] = 0x7c12dba6; /* mtspr TRIG2,r0 (SPR #882) 
*/
   327  
   328          start = PTRRELOC(&__start___entry_flush_fixup);
   329          end = PTRRELOC(&__stop___entry_flush_fixup);
   330          for (i = 0; start < end; start++, i++) {
   331                  dest = (void *)start + *start;
   332  
   333                  pr_devel("patching dest %lx\n", (unsigned long)dest);
   334  
   335                  patch_instruction((struct ppc_inst *)dest, 
ppc_inst(instrs[0]));
   336  
   337                  if (types == L1D_FLUSH_FALLBACK)
   338                          patch_branch((struct ppc_inst *)(dest + 1), 
(unsigned long)&entry_flush_fallback,
   339                                       BRANCH_SET_LINK);
   340                  else
   341                          patch_instruction((struct ppc_inst *)(dest + 
1), ppc_inst(instrs[1]));
   342  
   343                  patch_instruction((struct ppc_inst *)(dest + 2), 
ppc_inst(instrs[2]));
   344          }
   345  
   346          start = PTRRELOC(&__start___scv_entry_flush_fixup);
   347          end = PTRRELOC(&__stop___scv_entry_flush_fixup);
   348          for (; start < end; start++, i++) {
   349                  dest = (void *)start + *start;
   350  
   351                  pr_devel("patching dest %lx\n", (unsigned long)dest);
   352  
   353                  patch_instruction((struct ppc_inst *)dest, 
ppc_inst(instrs[0]));
   354  
   355                  if (types == L1D_FLUSH_FALLBACK)
   356                          patch_branch((struct ppc_inst *)(dest + 1), 
(unsigned long)&scv_entry_flush_fallback,
   357                                       BRANCH_SET_LINK);
   358                  else
   359                          patch_instruction((struct ppc_inst *)(dest + 
1), ppc_inst(instrs[1]));
   360  
   361                  patch_instruction((struct ppc_inst *)(dest + 2), 
ppc_inst(instrs[2]));
   362          }
   363  
   364  
   365          printk(KERN_DEBUG "entry-flush: patched %d locations (%s 
flush)\n", i,
   366                  (types == L1D_FLUSH_NONE)       ? "no" :
   367                  (types == L1D_FLUSH_FALLBACK)   ? "fallback 
displacement" :
   368                  (types &  L1D_FLUSH_ORI)        ? (types & 
L1D_FLUSH_MTTRIG)
   369                                                          ? "ori+mttrig 
type"
   370                                                          : "ori type" :
   371                  (types &  L1D_FLUSH_MTTRIG)     ? "mttrig type"
   372                                                  : "unknown");
   373  
   374          return 0;
   375  }
   376  

---
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.config.gz
Description: application/gzip