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SubjectRe: [PATCH v3 3/9] lib: zstd: Upgrade to latest upstream zstd version 1.4.6
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Hi Nick,

Thanks for the feedback, we'll take a look at these errors that maybe
false positives.

Best Regards,
Rong Chen

On 9/24/20 11:05 AM, Nick Terrell wrote:
> On Wed, Sep 23, 2020 at 7:28 PM kernel test robot <lkp@intel.com> wrote:
>> Hi Nick,
>>
>> Thank you for the patch! Yet something to improve:
>>
>> [auto build test ERROR on kdave/for-next]
>> [also build test ERROR on f2fs/dev-test linus/master v5.9-rc6 next-20200923]
>> [cannot apply to cryptodev/master crypto/master]
>> [If your patch is applied to the wrong git tree, kindly drop us a note.
>> And when submitting patch, we suggest to use '--base' as documented in
>> https://git-scm.com/docs/git-format-patch]
>>
>> url: https://github.com/0day-ci/linux/commits/Nick-Terrell/Update-to-zstd-1-4-6/20200924-064102
>> base: https://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-next
>> config: h8300-randconfig-p002-20200923 (attached as .config)
>> compiler: h8300-linux-gcc (GCC) 9.3.0
>> 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
>> # save the attached .config to linux build tree
>> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=h8300
>>
>> 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 >>):
>>
>> h8300-linux-ld: lib/zstd/common/entropy_common.o: in function `MEM_swap32':
>>>> lib/zstd/common/mem.h:179: undefined reference to `__bswapsi2'
>>>> h8300-linux-ld: lib/zstd/common/mem.h:179: undefined reference to `__bswapsi2'
>>>> h8300-linux-ld: lib/zstd/common/mem.h:179: undefined reference to `__bswapsi2'
>>>> h8300-linux-ld: lib/zstd/common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/common/fse_decompress.o: in function `MEM_swap32':
>>>> lib/zstd/common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/common/fse_decompress.o:lib/zstd/common/mem.h:179: more undefined references to `__bswapsi2' follow
>> h8300-linux-ld: lib/zstd/compress/zstd_compress.o: in function `MEM_swap64':
>>>> lib/zstd/compress/../common/mem.h:192: undefined reference to `__bswapdi2'
>> h8300-linux-ld: lib/zstd/compress/zstd_compress.o: in function `MEM_swap32':
>>>> lib/zstd/compress/../common/mem.h:179: undefined reference to `__bswapsi2'
>>>> h8300-linux-ld: lib/zstd/compress/../common/mem.h:179: undefined reference to `__bswapsi2'
>>>> h8300-linux-ld: lib/zstd/compress/../common/mem.h:179: undefined reference to `__bswapsi2'
>>>> h8300-linux-ld: lib/zstd/compress/../common/mem.h:179: undefined reference to `__bswapsi2'
>>>> h8300-linux-ld: lib/zstd/compress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/compress/zstd_compress.o:lib/zstd/compress/../common/mem.h:179: more undefined references to `__bswapsi2' follow
>> h8300-linux-ld: lib/zstd/compress/zstd_double_fast.o: in function `MEM_swap64':
>>>> lib/zstd/compress/../common/mem.h:192: undefined reference to `__bswapdi2'
>>>> h8300-linux-ld: lib/zstd/compress/../common/mem.h:192: undefined reference to `__bswapdi2'
>>>> h8300-linux-ld: lib/zstd/compress/../common/mem.h:192: undefined reference to `__bswapdi2'
>>>> h8300-linux-ld: lib/zstd/compress/../common/mem.h:192: undefined reference to `__bswapdi2'
>>>> h8300-linux-ld: lib/zstd/compress/../common/mem.h:192: undefined reference to `__bswapdi2'
>> h8300-linux-ld: lib/zstd/compress/zstd_double_fast.o:lib/zstd/compress/../common/mem.h:192: more undefined references to `__bswapdi2' follow
>> h8300-linux-ld: lib/zstd/compress/zstd_opt.o: in function `MEM_swap32':
>>>> lib/zstd/compress/../common/mem.h:179: undefined reference to `__bswapsi2'
>>>> h8300-linux-ld: lib/zstd/compress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/compress/zstd_opt.o: in function `MEM_swap64':
>>>> lib/zstd/compress/../common/mem.h:192: undefined reference to `__bswapdi2'
>>>> h8300-linux-ld: lib/zstd/compress/../common/mem.h:192: undefined reference to `__bswapdi2'
>> h8300-linux-ld: lib/zstd/compress/../common/mem.h:192: undefined reference to `__bswapdi2'
>> h8300-linux-ld: lib/zstd/compress/../common/mem.h:192: undefined reference to `__bswapdi2'
>> h8300-linux-ld: lib/zstd/compress/../common/mem.h:192: undefined reference to `__bswapdi2'
>> h8300-linux-ld: lib/zstd/compress/zstd_opt.o:lib/zstd/compress/../common/mem.h:192: more undefined references to `__bswapdi2' follow
>> h8300-linux-ld: lib/zstd/decompress/huf_decompress.o: in function `MEM_swap32':
>> lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/huf_decompress.o:lib/zstd/decompress/../common/mem.h:179: more undefined references to `__bswapsi2' follow
>> h8300-linux-ld: lib/zstd/decompress/zstd_decompress.o: in function `MEM_swap64':
>> lib/zstd/decompress/../common/mem.h:192: undefined reference to `__bswapdi2'
>> h8300-linux-ld: lib/zstd/decompress/zstd_decompress.o: in function `MEM_swap32':
>> lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/zstd_decompress.o:lib/zstd/decompress/../common/mem.h:179: more undefined references to `__bswapsi2' follow
>> h8300-linux-ld: lib/zstd/decompress/zstd_decompress.o: in function `MEM_swap64':
>> lib/zstd/decompress/../common/mem.h:192: undefined reference to `__bswapdi2'
>> h8300-linux-ld: lib/zstd/decompress/zstd_decompress.o: in function `MEM_swap32':
>> lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/zstd_decompress.o: in function `MEM_swap64':
>> lib/zstd/decompress/../common/mem.h:192: undefined reference to `__bswapdi2'
>> h8300-linux-ld: lib/zstd/decompress/zstd_decompress.o: in function `MEM_swap32':
>> lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/zstd_decompress.o: in function `MEM_swap64':
>> lib/zstd/decompress/../common/mem.h:192: undefined reference to `__bswapdi2'
>> h8300-linux-ld: lib/zstd/decompress/zstd_decompress.o: in function `MEM_swap32':
>> lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/zstd_decompress.o: in function `MEM_swap64':
>> lib/zstd/decompress/../common/mem.h:192: undefined reference to `__bswapdi2'
>> h8300-linux-ld: lib/zstd/decompress/zstd_decompress.o: in function `MEM_swap32':
>> lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/zstd_decompress.o:lib/zstd/decompress/../common/mem.h:179: more undefined references to `__bswapsi2' follow
>> h8300-linux-ld: lib/zstd/decompress/zstd_decompress.o: in function `MEM_swap64':
>> lib/zstd/decompress/../common/mem.h:192: undefined reference to `__bswapdi2'
>> h8300-linux-ld: lib/zstd/decompress/zstd_decompress.o: in function `MEM_swap32':
>> lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/zstd_decompress_block.o: in function `MEM_swap32':
>> lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/../common/mem.h:179: undefined reference to `__bswapsi2'
>> h8300-linux-ld: lib/zstd/decompress/zstd_decompress_block.o:lib/zstd/decompress/../common/mem.h:179: more undefined references to `__bswapsi2' follow
> Looks like I need to fix these. It looks like I should use the swab*()
> functions from include/linux/swab.h. I'll put up a v4 shortly.
>
>> cppcheck warnings: (new ones prefixed by >>)
>>
>>>> lib/zstd/decompress/zstd_ddict.c:147:32: warning: Boolean result is used in bitwise operation. Clarify expression with parentheses. [clarifyCondition]
>> if (!customMem.customAlloc ^ !customMem.customFree) return NULL;
>> ^
> This one is a bit silly, but I will fix it.
>
>>>> lib/zstd/common/zstd_deps.h:131:0: warning: syntax error [syntaxError]
>> ^
>>>> lib/zstd/compress/zstd_ldm.c:571:0: warning: Array 'rep[3]' accessed at index 3, which is out of bounds. [arrayIndexOutOfBounds]
>> ZSTD_blockCompressor const blockCompressor =
>> ^
> This seems like a false positive.
>
>>>> lib/zstd/common/zstd_deps.h:131:0: warning: syntax error [syntaxError]
>> ^
>>>> lib/zstd/decompress/zstd_decompress.c:133:32: warning: Boolean result is used in bitwise operation. Clarify expression with parentheses. [clarifyCondition]
>> if (!customMem.customAlloc ^ !customMem.customFree) return NULL;
>> ^
>>>> lib/zstd/decompress/zstd_decompress.c:1751:28: warning: Variable 'zds->inPos' is reassigned a value before the old one has been used. [redundantAssignment]
>> zds->inPos = 0; /* input is consumed */
>> ^
>> lib/zstd/decompress/zstd_decompress.c:1747:28: note: Variable 'zds->inPos' is reassigned a value before the old one has been used.
>> zds->inPos += loadedSize;
>> ^
>> lib/zstd/decompress/zstd_decompress.c:1751:28: note: Variable 'zds->inPos' is reassigned a value before the old one has been used.
>> zds->inPos = 0; /* input is consumed */
>> ^
> This is a false positive. It is incorrectly analyzing the control flow.
>
>>>> lib/zstd/common/zstd_deps.h:131:0: warning: syntax error [syntaxError]
>> ^
>>>> lib/zstd/compress/zstd_compress.c:84:32: warning: Boolean result is used in bitwise operation. Clarify expression with parentheses. [clarifyCondition]
>> if (!customMem.customAlloc ^ !customMem.customFree) return NULL;
>> ^
>> lib/zstd/compress/zstd_compress.c:200:32: warning: Boolean result is used in bitwise operation. Clarify expression with parentheses. [clarifyCondition]
>> if (!customMem.customAlloc ^ !customMem.customFree) return NULL;
>> ^
>> lib/zstd/compress/zstd_compress.c:3345:32: warning: Boolean result is used in bitwise operation. Clarify expression with parentheses. [clarifyCondition]
>> if (!customMem.customAlloc ^ !customMem.customFree) return NULL;
>> ^
>>>> lib/zstd/common/zstd_internal.h:401:27: warning: Array 'DeBruijnClz[32]' accessed at index 509099, which is out of bounds. [arrayIndexOutOfBounds]
>> return DeBruijnClz[(v * 0x07C4ACDDU) >> 27];
>> ^
> This is a false positive. v is a 32-bit integer, so the index must be
> less than 2^(32-27) = 32, which is the size of the array.
>
>> lib/zstd/compress/zstd_compress.c:3494:40: note: Assignment 'limitedSrcSize=(uint32_t)(pledgedSrcSize<524288U?pledgedSrcSize:524288U)', assigned value is 524288
>> U32 const limitedSrcSize = (U32)MIN(pledgedSrcSize, 1U << 19);
>> ^
>> lib/zstd/compress/zstd_compress.c:3495:90: note: Calling function 'ZSTD_highbit32', 1st argument 'limitedSrcSize-1' value is 524287
>> U32 const limitedSrcLog = limitedSrcSize > 1 ? ZSTD_highbit32(limitedSrcSize - 1) + 1 : 1;
>> ^
>> lib/zstd/common/zstd_internal.h:395:17: note: Assignment 'v=val', assigned value is 524287
>> U32 v = val;
>> ^
>> lib/zstd/common/zstd_internal.h:396:0: note: Assignment 'v=v|(v>>1)', assigned value is 524287
>> v |= v >> 1;
>> ^
>> lib/zstd/common/zstd_internal.h:397:0: note: Assignment 'v=v|(v>>2)', assigned value is 524287
>> v |= v >> 2;
>> ^
>> lib/zstd/common/zstd_internal.h:398:0: note: Assignment 'v=v|(v>>4)', assigned value is 524287
>> v |= v >> 4;
>> ^
>> lib/zstd/common/zstd_internal.h:399:0: note: Assignment 'v=v|(v>>8)', assigned value is 524287
>> v |= v >> 8;
>> ^
>> lib/zstd/common/zstd_internal.h:400:0: note: Assignment 'v=v|(v>>16)', assigned value is 524287
>> v |= v >> 16;
>> ^
>> lib/zstd/common/zstd_internal.h:401:27: note: Array index out of bounds
>> return DeBruijnClz[(v * 0x07C4ACDDU) >> 27];
>> ^
>>>> lib/zstd/common/zstd_deps.h:131:0: warning: syntax error [syntaxError]
>> ^
>>>> lib/zstd/compress/zstd_lazy.c:663:74: warning: Overflow in pointer arithmetic, NULL pointer is subtracted. [nullPointerArithmetic]
>> const U32 dictAndPrefixLength = (U32)((ip - prefixLowest) + (dictEnd - dictLowest));
>> ^
>> lib/zstd/compress/zstd_lazy.c:658:70: note: Assignment 'dictEnd=dictMode==ZSTD_dictMatchState?dms->window.nextSrc:NULL', assigned value is 0
>> const BYTE* const dictEnd = dictMode == ZSTD_dictMatchState ?
>> ^
>> lib/zstd/compress/zstd_lazy.c:663:74: note: Null pointer subtraction
>> const U32 dictAndPrefixLength = (U32)((ip - prefixLowest) + (dictEnd - dictLowest));
>> ^
>>>> lib/zstd/common/zstd_deps.h:131:0: warning: syntax error [syntaxError]
>> ^
>>>> lib/zstd/compress/zstd_double_fast.c:97:75: warning: Overflow in pointer arithmetic, NULL pointer is subtracted. [nullPointerArithmetic]
>> const U32 dictAndPrefixLength = (U32)((ip - prefixLowest) + (dictEnd - dictStart));
>> ^
>> lib/zstd/compress/zstd_double_fast.c:88:70: note: Assignment 'dictEnd=dictMode==ZSTD_dictMatchState?dms->window.nextSrc:NULL', assigned value is 0
>> const BYTE* const dictEnd = dictMode == ZSTD_dictMatchState ?
>> ^
>> lib/zstd/compress/zstd_double_fast.c:97:75: note: Null pointer subtraction
>> const U32 dictAndPrefixLength = (U32)((ip - prefixLowest) + (dictEnd - dictStart));
>> ^
> Seems like another false positive.
>
>>>> lib/zstd/common/zstd_deps.h:131:0: warning: syntax error [syntaxError]
>> ^
>>
>> # https://github.com/0day-ci/linux/commit/400786d3b08436113bcb3c9c16a97eefc31317c1
>> git remote add linux-review https://github.com/0day-ci/linux
>> git fetch --no-tags linux-review Nick-Terrell/Update-to-zstd-1-4-6/20200924-064102
>> git checkout 400786d3b08436113bcb3c9c16a97eefc31317c1
>> vim +179 lib/zstd/common/mem.h
>>
>> 173
>> 174
>> 175 MEM_STATIC U32 MEM_swap32(U32 in)
>> 176 {
>> 177 #if (defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403)) \
>> 178 || (defined(__clang__) && __has_builtin(__builtin_bswap32))
>> > 179 return __builtin_bswap32(in);
>> 180 #else
>> 181 return ((in << 24) & 0xff000000 ) |
>> 182 ((in << 8) & 0x00ff0000 ) |
>> 183 ((in >> 8) & 0x0000ff00 ) |
>> 184 ((in >> 24) & 0x000000ff );
>> 185 #endif
>> 186 }
>> 187
>>
>> ---
>> 0-DAY CI Kernel Test Service, Intel Corporation
>> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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