[tip:timers/vdso 4/4] arch/sparc/include/uapi/../../../../lib/vdso/gettimeofday.c:288:24: error: call to undeclared function 'BITS_PER_TYPE'; ISO C99 and later do not support implicit function declarations

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/vdso
head:   ca46a07c4b68246c4e400ce3649ab7228a878d8f
commit: ca46a07c4b68246c4e400ce3649ab7228a878d8f [4/4] vdso/gettimeofday: Assert that the clockid fits into the u32 bitmask
config: sparc64-defconfig (https://download.01.org/0day-ci/archive/20260930/202609301648.OQYqz8q1-lkp@intel.com/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 5f609f950d2e80addf5566623013db68394334db)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260930/202609301648.OQYqz8q1-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/202609301648.OQYqz8q1-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/sparc/vdso/vclock_gettime.c:22:
>> arch/sparc/include/uapi/../../../../lib/vdso/gettimeofday.c:288:24: error: call to undeclared function 'BITS_PER_TYPE'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     288 |         BUILD_BUG_ON(clock >= BITS_PER_TYPE(msk));
         |                               ^
   1 error generated.


vim +/BITS_PER_TYPE +288 arch/sparc/include/uapi/../../../../lib/vdso/gettimeofday.c

   273	
   274	static __always_inline bool
   275	__cvdso_clock_gettime_common(const struct vdso_time_data *vd, clockid_t clock,
   276				     struct __kernel_timespec *ts)
   277	{
   278		const struct vdso_clock *vc = vd->clock_data;
   279		u32 msk;
   280	
   281		if (!vdso_clockid_valid(clock))
   282			return false;
   283	
   284		/*
   285		 * Convert the clockid to a bitmask and use it to check which
   286		 * clocks are handled in the VDSO directly.
   287		 */
 > 288		BUILD_BUG_ON(clock >= BITS_PER_TYPE(msk));
   289		msk = 1U << clock;
   290		if (likely(msk & VDSO_HRES))
   291			vc = &vc[CS_HRES_COARSE];
   292		else if (msk & VDSO_COARSE)
   293			return do_coarse(vd, &vc[CS_HRES_COARSE], clock, ts);
   294		else if (msk & VDSO_RAW)
   295			vc = &vc[CS_RAW];
   296		else if (msk & VDSO_AUX)
   297			return do_aux(vd, clock, ts);
   298		else
   299			return false;
   300	
   301		return do_hres(vd, vc, clock, ts);
   302	}
   303	

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