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Date: Sat, 5 Feb 2022 09:16:58 +0800
From: kernel test robot <lkp@...el.com>
To: Nick Alcock <nick.alcock@...cle.com>
Cc: llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
linux-kernel@...r.kernel.org,
Kris Van Hees <kris.van.hees@...cle.com>
Subject: [oracle-dtrace:v2/5.17-rc2 6/10] kernel/kallsyms.c:775:3: error:
expected expression
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@intel.com/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@...el.com>
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
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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