[dvyukov:dvyukov-rseq-pkey 1/3] arch/x86/kernel/process.c:270:2: error: call to undeclared function 'pkru_write_default'; ISO C99 and later do not support implicit function declarations

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/dvyukov/linux dvyukov-rseq-pkey
head:   1063b1cd65e97d1ec20c1e016f8d4414d1c40df8
commit: 963efc053e92eb50c830ad41445a77e8607b5d98 [1/3] pkeys: add API to switch to permissive pkey register
config: i386-buildonly-randconfig-003-20250216 (https://download.01.org/0day-ci/archive/20250216/202502162255.fYDLueTx-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250216/202502162255.fYDLueTx-lkp@intel.com/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 <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202502162255.fYDLueTx-lkp@intel.com/

All errors (new ones prefixed by >>):

>> arch/x86/kernel/process.c:270:2: error: call to undeclared function 'pkru_write_default'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     270 |         pkru_write_default();
         |         ^
   1 error generated.
--
>> arch/x86/kernel/fpu/core.c:706:2: error: call to undeclared function 'pkru_write_default'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     706 |         pkru_write_default();
         |         ^
   1 error generated.
--
>> arch/x86/kernel/cpu/common.c:534:2: error: call to undeclared function 'pkru_write_default'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     534 |         pkru_write_default();
         |         ^
   1 error generated.


vim +/pkru_write_default +270 arch/x86/kernel/process.c

2fff071d28b54f Thomas Gleixner 2019-11-11  263  
33344368cb08f8 Andy Lutomirski 2021-06-23  264  static void pkru_flush_thread(void)
33344368cb08f8 Andy Lutomirski 2021-06-23  265  {
33344368cb08f8 Andy Lutomirski 2021-06-23  266  	/*
33344368cb08f8 Andy Lutomirski 2021-06-23  267  	 * If PKRU is enabled the default PKRU value has to be loaded into
33344368cb08f8 Andy Lutomirski 2021-06-23  268  	 * the hardware right here (similar to context switch).
33344368cb08f8 Andy Lutomirski 2021-06-23  269  	 */
33344368cb08f8 Andy Lutomirski 2021-06-23 @270  	pkru_write_default();
33344368cb08f8 Andy Lutomirski 2021-06-23  271  }
33344368cb08f8 Andy Lutomirski 2021-06-23  272  

:::::: The code at line 270 was first introduced by commit
:::::: 33344368cb08f8d6bf55a32aa052318d3a69ea84 x86/fpu: Clean up the fpu__clear() variants

:::::: TO: Andy Lutomirski <luto@kernel.org>
:::::: CC: Borislav Petkov <bp@suse.de>

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