[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 <lkp@intel.com>]

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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 <lkp@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	

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

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