[oracle-dtrace:v2/5.17-rc2 6/10] kernel/kallsyms.c:775:3: error: expected expression

[kernel test robot]

tree:   https://github.com/oracle/dtrace-linux-kernel v2/5.17-rc2
head:   47946e7b2e2319f39cbb7f8aaa294298c2dec5b4
commit: ea16e4ce65d8342913051086a89eac87dc54aced [6/10] kallsyms: add /proc/kallmodsyms
config: s390-randconfig-r032-20220130 (https://download.01.org/0day-ci/archive/20220205/202202050909.66P7tRUv-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project a73e4ce6a59b01f0e37037761c1e6889d539d233)
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 s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # https://github.com/oracle/dtrace-linux-kernel/commit/ea16e4ce65d8342913051086a89eac87dc54aced
        git remote add oracle-dtrace https://github.com/oracle/dtrace-linux-kernel
        git fetch --no-tags oracle-dtrace v2/5.17-rc2
        git checkout ea16e4ce65d8342913051086a89eac87dc54aced
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash

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

All error/warnings (new ones prefixed by >>):

   In file included from kernel/kallsyms.c:25:
   In file included from include/linux/filter.h:12:
   In file included from include/linux/skbuff.h:31:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:464:31: 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:477:61: 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/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
                                                             ^
   include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
   #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
                                                        ^
   In file included from kernel/kallsyms.c:25:
   In file included from include/linux/filter.h:12:
   In file included from include/linux/skbuff.h:31:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:490:61: 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/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
                                                             ^
   include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
   #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
                                                        ^
   In file included from kernel/kallsyms.c:25:
   In file included from include/linux/filter.h:12:
   In file included from include/linux/skbuff.h:31:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:501:33: 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:511:59: 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:521:59: 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);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsb(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsw(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsl(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesb(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesw(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesl(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   kernel/kallsyms.c:666:12: warning: no previous prototype for function 'arch_get_kallsym' [-Wmissing-prototypes]
   int __weak arch_get_kallsym(unsigned int symnum, unsigned long *value,
              ^
   kernel/kallsyms.c:666:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int __weak arch_get_kallsym(unsigned int symnum, unsigned long *value,
   ^
   static 
>> kernel/kallsyms.c:775:3: error: expected expression
                   unsigned long mod_idx = (unsigned long) -1;
                   ^
>> kernel/kallsyms.c:806:28: warning: comparison between pointer and integer ('unsigned long' and 'char (*)[]') [-Wpointer-integer-compare]
                     if (likely(iter->value != &_etext))
                                ~~~~~~~~~~~ ^  ~~~~~~~
   include/linux/compiler.h:77:40: note: expanded from macro 'likely'
   # define likely(x)      __builtin_expect(!!(x), 1)
                                               ^
   kernel/kallsyms.c:804:17: warning: unused variable 'endstr' [-Wunused-variable]
                     const char *endstr;
                                 ^
   15 warnings and 1 error generated.


vim +775 kernel/kallsyms.c

   755	
   756	/* Returns space to next name. */
   757	static unsigned long get_ksymbol_core(struct kallsym_iter *iter, int kallmodsyms)
   758	{
   759		unsigned off = iter->nameoff;
   760	
   761		iter->exported = 0;
   762		iter->value = kallsyms_sym_address(iter->pos);
   763	
   764		iter->type = kallsyms_get_symbol_type(off);
   765	
   766		iter->module_name[0] = '\0';
   767		iter->builtin_module_names = NULL;
   768	
   769		off = kallsyms_expand_symbol(off, iter->name, ARRAY_SIZE(iter->name));
   770	#ifdef CONFIG_KALLMODSYMS
   771		if (kallmodsyms) {
   772			unsigned long mod_idx = (unsigned long) -1;
   773	
   774			if (kallsyms_module_offsets)
 > 775			unsigned long mod_idx = (unsigned long) -1;
   776	
   777			if (kallsyms_module_offsets)
   778				mod_idx =
   779				  get_builtin_module_idx(iter->value,
   780							 iter->hint_builtin_module_idx);
   781	
   782			/*
   783			 * This is a built-in module iff the tables of built-in modules
   784			 * (address->module name mappings) and module names are known,
   785			 * and if the address was found there, and if the corresponding
   786			 * module index is nonzero, and iff this is a text (or weak)
   787			 * symbol.  All other cases mean off the end of the binary or in
   788			 * a non-modular range in between one or more modules.  (Also
   789			 * guard against a corrupt kallsyms_objfiles array pointing off
   790			 * the end of kallsyms_modules.)
   791			 */
   792			if (kallsyms_modules != NULL && kallsyms_module_names != NULL &&
   793			    (iter->type == 't' || iter->type == 'T' ||
   794			     iter->type == 'w' || iter->type == 'W') &&
   795			    mod_idx != (unsigned long) -1 &&
   796			    kallsyms_modules[mod_idx] != 0 &&
   797			    kallsyms_modules[mod_idx] < kallsyms_module_names_len) {
   798			  /*
   799			   * Rule out (rare) section start/end symbols which might
   800			   * overlap the last symbol in .text.  (Will also hit at most
   801			   * one symbol which really is in a built-in module, but only
   802			   * if that symbol is zero-length.)
   803			   */
   804			  const char *endstr;
   805	
 > 806			  if (likely(iter->value != &_etext))
   807			    iter->builtin_module_names =
   808			      &kallsyms_module_names[kallsyms_modules[mod_idx]];
   809			}
   810			iter->hint_builtin_module_idx = mod_idx;
   811		}
   812	#endif
   813		return off - iter->nameoff;
   814	}
   815	

---
0-DAY CI Kernel Test Service, Intel Corporation
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