[thomas-weissschuh:b4/nolibc-rcutorture 40/40] kernel/rcu/rcutorture-init.c:3:10: fatal error: 'unistd.h' file not found

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/thomas.weissschuh/linux.git b4/nolibc-rcutorture
head:   a55c66cad77542e2efcb3248af724efce7cc2d87
commit: a55c66cad77542e2efcb3248af724efce7cc2d87 [40/40] rcurorture init
config: hexagon-randconfig-001-20260326 (https://download.01.org/0day-ci/archive/20260326/202603261643.Ha4DqhvA-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 054e11d1a17e5ba88bb1a8ef32fad3346e80b186)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260326/202603261643.Ha4DqhvA-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/202603261643.Ha4DqhvA-lkp@intel.com/

All errors (new ones prefixed by >>):

>> kernel/rcu/rcutorture-init.c:3:10: fatal error: 'unistd.h' file not found
       3 | #include <unistd.h>
         |          ^~~~~~~~~~
   1 error generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for GEN_INIT_CPIO
   Depends on [n]: BLK_DEV_INITRD [=n]
   Selected by [y]:
   - RCU_TORTURE_TEST [=y] && DEBUG_KERNEL [=y]


vim +3 kernel/rcu/rcutorture-init.c

     2	
   > 3	#include <unistd.h>
     4	#include <stdio.h>
     5	#include <sys/time.h>
     6	

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