[daveh-devel:kss-2026-10-19 16/24] arch/x86/include/asm/thread_info.h:237:6: warning: no previous prototype for 'arch_kernel_shstk_enabled'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/daveh/devel.git kss-2026-10-19
head:   b28e7d03a8472efab137c77cbb5dd666fa08e9a7
commit: 967449663fb3eb7dcca67c4652293712530809c8 [16/24] arch-shadow-stacks-enabled
config: x86_64-rhel-9.4-kselftests (https://download.01.org/0day-ci/archive/20261022/202610220331.gTfoHeL9-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261022/202610220331.gTfoHeL9-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/202610220331.gTfoHeL9-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/thread_info.h:62,
                    from include/linux/smp.h:118,
                    from include/linux/interrupt_rc.h:17,
                    from include/linux/spinlock.h:60,
                    from include/linux/swait.h:7,
                    from include/linux/completion.h:12,
                    from include/linux/crypto.h:15,
                    from arch/x86/kernel/asm-offsets.c:9:
>> arch/x86/include/asm/thread_info.h:237:6: warning: no previous prototype for 'arch_kernel_shstk_enabled' [-Wmissing-prototypes]
     237 | bool arch_kernel_shstk_enabled(void)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/thread_info.h:237:20: error: redefinition of 'arch_kernel_shstk_enabled'
     237 | static inline bool arch_kernel_shstk_enabled(void)
         |                    ^~~~~~~~~~~~~~~~~~~~~~~~~
   arch/x86/include/asm/thread_info.h:237:6: note: previous definition of 'arch_kernel_shstk_enabled' with type 'bool(void)' {aka '_Bool(void)'}
     237 | bool arch_kernel_shstk_enabled(void)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~
   make[3]: *** [scripts/Makefile.build:185: arch/x86/kernel/asm-offsets.s] Error 1
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1425: prepare0] Error 2
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:248: __sub-make] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:248: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +/arch_kernel_shstk_enabled +237 arch/x86/include/asm/thread_info.h

   236	
 > 237	bool arch_kernel_shstk_enabled(void)
   238	{
   239		return cpu_feature_enabled(X86_FEATURE_KERN_SHSTK);
   240	}
   241	#define arch_init_thread_stacks arch_init_thread_stacks
   242	

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