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Subject[intel-tdx:guest-filter 10/28] arch/x86/kernel/head64.c:527:2: error: call to undeclared function 'tdx_filter_init'; ISO C99 and later do not support implicit function declarations
tree:   https://github.com/intel/tdx.git guest-filter
head: 0a555e67b143701a81612d819e693cf5786de418
commit: f0270b8da57a2d69e1eb8aa9c79ad9b6a01c90ab [10/28] x86/tdx: Add command line option to disable TDX guest filter support
config: x86_64-randconfig-a002-20220627 (https://download.01.org/0day-ci/archive/20220628/202206282311.jGZChFVY-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project df18167ac56d05f2ab55f9d874aee7ab6d5bc9a2)
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
# https://github.com/intel/tdx/commit/f0270b8da57a2d69e1eb8aa9c79ad9b6a01c90ab
git remote add intel-tdx https://github.com/intel/tdx.git
git fetch --no-tags intel-tdx guest-filter
git checkout f0270b8da57a2d69e1eb8aa9c79ad9b6a01c90ab
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> arch/x86/kernel/head64.c:527:2: error: call to undeclared function 'tdx_filter_init'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
tdx_filter_init();
^
1 error generated.


vim +/tdx_filter_init +527 arch/x86/kernel/head64.c

471
472 asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data)
473 {
474 /*
475 * Build-time sanity checks on the kernel image and module
476 * area mappings. (these are purely build-time and produce no code)
477 */
478 BUILD_BUG_ON(MODULES_VADDR < __START_KERNEL_map);
479 BUILD_BUG_ON(MODULES_VADDR - __START_KERNEL_map < KERNEL_IMAGE_SIZE);
480 BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE);
481 BUILD_BUG_ON((__START_KERNEL_map & ~PMD_MASK) != 0);
482 BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0);
483 BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL));
484 MAYBE_BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) ==
485 (__START_KERNEL & PGDIR_MASK)));
486 BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END);
487
488 cr4_init_shadow();
489
490 /* Kill off the identity-map trampoline */
491 reset_early_page_tables();
492
493 clear_bss();
494
495 /*
496 * This needs to happen *before* kasan_early_init() because latter maps stuff
497 * into that page.
498 */
499 clear_page(init_top_pgt);
500
501 /*
502 * SME support may update early_pmd_flags to include the memory
503 * encryption mask, so it needs to be called before anything
504 * that may generate a page fault.
505 */
506 sme_early_init();
507
508 kasan_early_init();
509
510 /*
511 * Flush global TLB entries which could be left over from the trampoline page
512 * table.
513 *
514 * This needs to happen *after* kasan_early_init() as KASAN-enabled .configs
515 * instrument native_write_cr4() so KASAN must be initialized for that
516 * instrumentation to work.
517 */
518 __native_tlb_flush_global(this_cpu_read(cpu_tlbstate.cr4));
519
520 idt_setup_early_handler();
521
522 /* Needed before cc_platform_has() can be used for TDX */
523 tdx_early_init();
524
525 copy_bootdata(__va(real_mode_data));
526
> 527 tdx_filter_init();
528
529 /*
530 * Load microcode early on BSP.
531 */
532 load_ucode_bsp();
533
534 /* set init_top_pgt kernel high mapping*/
535 init_top_pgt[511] = early_top_pgt[511];
536
537 x86_64_start_reservations(real_mode_data);
538 }
539

--
0-DAY CI Kernel Test Service
https://01.org/lkp

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