[hch-block:blkdev.h-includes 1/17] lib/random32.c:578:9: error: implicit declaration of function 'kmalloc'

[hch-block:blkdev.h-includes 1/17] lib/random32.c:578:9: error: implicit declaration of function 'kmalloc'

[kernel test robot]

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tree:   git://git.infradead.org/users/hch/block.git blkdev.h-includes
head:   9a8385d2d0ea7e589b98c102f4a60576385ca6c7
commit: da3770fc4eb333d0132df546e4fa0d3467654a74 [1/17] mm: don't include <linux/blk-cgroup.h> in <linux/writeback.h>
config: i386-randconfig-a013-20210906 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 6fe2beba7d2a41964af658c8c59dd172683ef739)
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
        git remote add hch-block git://git.infradead.org/users/hch/block.git
        git fetch --no-tags hch-block blkdev.h-includes
        git checkout da3770fc4eb333d0132df546e4fa0d3467654a74
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=i386 

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 >>):

>> lib/random32.c:578:9: error: implicit declaration of function 'kmalloc' [-Werror,-Wimplicit-function-declaration]
           data = kmalloc(sizeof(*data) * TEST_SIZE, GFP_KERNEL);
                  ^
   lib/random32.c:578:9: note: did you mean 'kvmalloc'?
   include/linux/mm.h:803:21: note: 'kvmalloc' declared here
   static inline void *kvmalloc(size_t size, gfp_t flags)
                       ^
>> lib/random32.c:578:7: error: incompatible integer to pointer conversion assigning to 'u32 *' (aka 'unsigned int *') from 'int' [-Werror,-Wint-conversion]
           data = kmalloc(sizeof(*data) * TEST_SIZE, GFP_KERNEL);
                ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> lib/random32.c:609:2: error: implicit declaration of function 'kfree' [-Werror,-Wimplicit-function-declaration]
           kfree(data);
           ^
   lib/random32.c:609:2: note: did you mean 'kvfree'?
   include/linux/mm.h:833:13: note: 'kvfree' declared here
   extern void kvfree(const void *addr);
               ^
   3 errors generated.


vim +/kmalloc +578 lib/random32.c

c51f8f88d705e0 George Spelvin 2020-08-09  559  
c6e169bc146a76 Willy Tarreau  2020-10-24  560  #ifdef CONFIG_RANDOM32_SELFTEST
c6e169bc146a76 Willy Tarreau  2020-10-24  561  /* Principle: True 32-bit random numbers will all have 16 differing bits on
c6e169bc146a76 Willy Tarreau  2020-10-24  562   * average. For each 32-bit number, there are 601M numbers differing by 16
c6e169bc146a76 Willy Tarreau  2020-10-24  563   * bits, and 89% of the numbers differ by at least 12 bits. Note that more
c6e169bc146a76 Willy Tarreau  2020-10-24  564   * than 16 differing bits also implies a correlation with inverted bits. Thus
c6e169bc146a76 Willy Tarreau  2020-10-24  565   * we take 1024 random numbers and compare each of them to the other ones,
c6e169bc146a76 Willy Tarreau  2020-10-24  566   * counting the deviation of correlated bits to 16. Constants report 32,
c6e169bc146a76 Willy Tarreau  2020-10-24  567   * counters 32-log2(TEST_SIZE), and pure randoms, around 6 or lower. With the
c6e169bc146a76 Willy Tarreau  2020-10-24  568   * u32 total, TEST_SIZE may be as large as 4096 samples.
c6e169bc146a76 Willy Tarreau  2020-10-24  569   */
c6e169bc146a76 Willy Tarreau  2020-10-24  570  #define TEST_SIZE 1024
c6e169bc146a76 Willy Tarreau  2020-10-24  571  static int __init prandom32_state_selftest(void)
c6e169bc146a76 Willy Tarreau  2020-10-24  572  {
c6e169bc146a76 Willy Tarreau  2020-10-24  573  	unsigned int x, y, bits, samples;
c6e169bc146a76 Willy Tarreau  2020-10-24  574  	u32 xor, flip;
c6e169bc146a76 Willy Tarreau  2020-10-24  575  	u32 total;
c6e169bc146a76 Willy Tarreau  2020-10-24  576  	u32 *data;
c6e169bc146a76 Willy Tarreau  2020-10-24  577  
c6e169bc146a76 Willy Tarreau  2020-10-24 @578  	data = kmalloc(sizeof(*data) * TEST_SIZE, GFP_KERNEL);
c6e169bc146a76 Willy Tarreau  2020-10-24  579  	if (!data)
c6e169bc146a76 Willy Tarreau  2020-10-24  580  		return 0;
c6e169bc146a76 Willy Tarreau  2020-10-24  581  
c6e169bc146a76 Willy Tarreau  2020-10-24  582  	for (samples = 0; samples < TEST_SIZE; samples++)
c6e169bc146a76 Willy Tarreau  2020-10-24  583  		data[samples] = prandom_u32();
c6e169bc146a76 Willy Tarreau  2020-10-24  584  
c6e169bc146a76 Willy Tarreau  2020-10-24  585  	flip = total = 0;
c6e169bc146a76 Willy Tarreau  2020-10-24  586  	for (x = 0; x < samples; x++) {
c6e169bc146a76 Willy Tarreau  2020-10-24  587  		for (y = 0; y < samples; y++) {
c6e169bc146a76 Willy Tarreau  2020-10-24  588  			if (x == y)
c6e169bc146a76 Willy Tarreau  2020-10-24  589  				continue;
c6e169bc146a76 Willy Tarreau  2020-10-24  590  			xor = data[x] ^ data[y];
c6e169bc146a76 Willy Tarreau  2020-10-24  591  			flip |= xor;
c6e169bc146a76 Willy Tarreau  2020-10-24  592  			bits = hweight32(xor);
c6e169bc146a76 Willy Tarreau  2020-10-24  593  			total += (bits - 16) * (bits - 16);
c6e169bc146a76 Willy Tarreau  2020-10-24  594  		}
c6e169bc146a76 Willy Tarreau  2020-10-24  595  	}
c6e169bc146a76 Willy Tarreau  2020-10-24  596  
c6e169bc146a76 Willy Tarreau  2020-10-24  597  	/* We'll return the average deviation as 2*sqrt(corr/samples), which
c6e169bc146a76 Willy Tarreau  2020-10-24  598  	 * is also sqrt(4*corr/samples) which provides a better resolution.
c6e169bc146a76 Willy Tarreau  2020-10-24  599  	 */
c6e169bc146a76 Willy Tarreau  2020-10-24  600  	bits = int_sqrt(total / (samples * (samples - 1)) * 4);
c6e169bc146a76 Willy Tarreau  2020-10-24  601  	if (bits > 6)
c6e169bc146a76 Willy Tarreau  2020-10-24  602  		pr_warn("prandom32: self test failed (at least %u bits"
c6e169bc146a76 Willy Tarreau  2020-10-24  603  			" correlated, fixed_mask=%#x fixed_value=%#x\n",
c6e169bc146a76 Willy Tarreau  2020-10-24  604  			bits, ~flip, data[0] & ~flip);
c6e169bc146a76 Willy Tarreau  2020-10-24  605  	else
c6e169bc146a76 Willy Tarreau  2020-10-24  606  		pr_info("prandom32: self test passed (less than %u bits"
c6e169bc146a76 Willy Tarreau  2020-10-24  607  			" correlated)\n",
c6e169bc146a76 Willy Tarreau  2020-10-24  608  			bits+1);
c6e169bc146a76 Willy Tarreau  2020-10-24 @609  	kfree(data);
c6e169bc146a76 Willy Tarreau  2020-10-24  610  	return 0;
c6e169bc146a76 Willy Tarreau  2020-10-24  611  }
c6e169bc146a76 Willy Tarreau  2020-10-24  612  core_initcall(prandom32_state_selftest);
c6e169bc146a76 Willy Tarreau  2020-10-24  613  #endif /*  CONFIG_RANDOM32_SELFTEST */
c6e169bc146a76 Willy Tarreau  2020-10-24  614  

:::::: The code at line 578 was first introduced by commit
:::::: c6e169bc146a76d5ccbf4d3825f705414352bd03 random32: add a selftest for the prandom32 code

:::::: TO: Willy Tarreau <w@1wt.eu>
:::::: CC: Willy Tarreau <w@1wt.eu>

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

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