Re: [PATCH] lib/crypto: x86/chacha: Add a 16-block AVX-512 variant

Hi Martin,

kernel test robot noticed the following build errors:

[auto build test ERROR on linux-review/Eric-Biggers/x86-fpu-Check-for-missing-AVX-and-AVX-512-xstate-bits/20260626-124221]

url:    https://github.com/intel-lab-lkp/linux/commits/Martin-Willi/lib-crypto-x86-chacha-Add-a-16-block-AVX-512-variant/20260805-221950
base:   https://github.com/intel-lab-lkp/linux Eric-Biggers/x86-fpu-Check-for-missing-AVX-and-AVX-512-xstate-bits/20260626-124221
patch link:    https://lore.kernel.org/r/20260722153247.630519-1-martin%40strongswan.org
patch subject: [PATCH] lib/crypto: x86/chacha: Add a 16-block AVX-512 variant
config: x86_64-randconfig-075-20260806 (https://download.01.org/0day-ci/archive/20260806/[email protected]/config)
compiler: clang version 22.1.3 (https://github.com/llvm/llvm-project e9846648fd6183ee6d8cbdb4502213fcf902a211)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260806/[email protected]/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

   In file included from lib/crypto/chacha.c:35:
>> lib/crypto/x86/chacha.h:199:8: error: call to undeclared function 'cpu_has_xfeatures'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     199 |                             cpu_has_xfeatures(XFEATURE_MASK_AVX512, NULL))
         |                             ^
   1 error generated.


vim +/cpu_has_xfeatures +199 lib/crypto/x86/chacha.h

   180	
   181	#define chacha_mod_init_arch chacha_mod_init_arch
   182	static void chacha_mod_init_arch(void)
   183	{
   184		if (!boot_cpu_has(X86_FEATURE_SSSE3))
   185			return;
   186	
   187		static_branch_enable(&chacha_use_simd);
   188	
   189		if (boot_cpu_has(X86_FEATURE_AVX) &&
   190		    boot_cpu_has(X86_FEATURE_AVX2)) {
   191			static_branch_enable(&chacha_use_avx2);
   192	
   193			if (boot_cpu_has(X86_FEATURE_AVX512VL) &&
   194			    boot_cpu_has(X86_FEATURE_AVX512BW)) { /* kmovq */
   195				static_branch_enable(&chacha_use_avx512vl);
   196	
   197				if (boot_cpu_has(X86_FEATURE_AVX512F) &&
   198				    !boot_cpu_has(X86_FEATURE_PREFER_YMM) &&
 > 199				    cpu_has_xfeatures(XFEATURE_MASK_AVX512, NULL))

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