[ammarfaizi2-block:crng/random/jd/not-zero-entropy 7/11] arch/arm/include/asm/timex.h:19:22: error: implicit declaration of function 'read_current_timer' is invalid in C99

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

tree:   https://github.com/ammarfaizi2/linux-block crng/random/jd/not-zero-entropy
head:   ac7d8411f0216fe77e48592ed0ff2ccbd599d0de
commit: 5cde0b2eaaf94891163f14984697361fe51849e6 [7/11] arm: use sched_clock() for random_get_entropy() instead of zero
config: arm-randconfig-c002-20220408 (https://download.01.org/0day-ci/archive/20220409/202204090940.51vg3sZ7-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project c29a51b3a257908aebc01cd7c4655665db317d66)
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
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/ammarfaizi2/linux-block/commit/5cde0b2eaaf94891163f14984697361fe51849e6
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block crng/random/jd/not-zero-entropy
        git checkout 5cde0b2eaaf94891163f14984697361fe51849e6
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm prepare

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

All errors (new ones prefixed by >>):

   In file included from arch/arm/kernel/asm-offsets.c:11:
   In file included from include/linux/sched.h:15:
   In file included from include/linux/sem.h:5:
   In file included from include/uapi/linux/sem.h:5:
   In file included from include/linux/ipc.h:7:
   In file included from include/linux/rhashtable-types.h:15:
   In file included from include/linux/workqueue.h:9:
   In file included from include/linux/timer.h:6:
   In file included from include/linux/ktime.h:24:
   In file included from include/linux/time.h:60:
   In file included from include/linux/time32.h:13:
   In file included from include/linux/timex.h:66:
>> arch/arm/include/asm/timex.h:19:22: error: implicit declaration of function 'read_current_timer' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
           unsigned long ret = get_cycles();
                               ^
   arch/arm/include/asm/timex.h:15:37: note: expanded from macro 'get_cycles'
   #define get_cycles()    ({ cycles_t c; read_current_timer(&c) ? 0 : c; })
                                          ^
   In file included from arch/arm/kernel/asm-offsets.c:11:
   In file included from include/linux/sched.h:15:
   In file included from include/linux/sem.h:5:
   In file included from include/uapi/linux/sem.h:5:
   In file included from include/linux/ipc.h:7:
   In file included from include/linux/rhashtable-types.h:15:
   In file included from include/linux/workqueue.h:9:
   In file included from include/linux/timer.h:6:
   In file included from include/linux/ktime.h:24:
   In file included from include/linux/time.h:60:
   In file included from include/linux/time32.h:13:
   include/linux/timex.h:53:2: error: unterminated conditional directive
   #ifndef _LINUX_TIMEX_H
    ^
   In file included from arch/arm/kernel/asm-offsets.c:11:
   In file included from include/linux/sched.h:15:
   In file included from include/linux/sem.h:5:
   In file included from include/uapi/linux/sem.h:5:
   In file included from include/linux/ipc.h:7:
   In file included from include/linux/rhashtable-types.h:15:
   In file included from include/linux/workqueue.h:9:
   In file included from include/linux/timer.h:6:
   In file included from include/linux/ktime.h:25:
   In file included from include/linux/jiffies.h:11:
   include/linux/timex.h:53:2: error: unterminated conditional directive
   #ifndef _LINUX_TIMEX_H
    ^
   In file included from arch/arm/kernel/asm-offsets.c:12:
   In file included from include/linux/mm.h:700:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:6:
   include/linux/signal.h:97:11: warning: array index 3 is past the end of the array (which contains 2 elements) [-Warray-bounds]
                   return (set->sig[3] | set->sig[2] |
                           ^        ~
   arch/arm/include/asm/signal.h:17:2: note: array 'sig' declared here
           unsigned long sig[_NSIG_WORDS];
           ^
   In file included from arch/arm/kernel/asm-offsets.c:12:
   In file included from include/linux/mm.h:700:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:6:
   include/linux/signal.h:97:25: warning: array index 2 is past the end of the array (which contains 2 elements) [-Warray-bounds]
                   return (set->sig[3] | set->sig[2] |
                                         ^        ~
   arch/arm/include/asm/signal.h:17:2: note: array 'sig' declared here
           unsigned long sig[_NSIG_WORDS];
           ^
   In file included from arch/arm/kernel/asm-offsets.c:12:
   In file included from include/linux/mm.h:700:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:6:
   include/linux/signal.h:113:11: warning: array index 3 is past the end of the array (which contains 2 elements) [-Warray-bounds]
                   return  (set1->sig[3] == set2->sig[3]) &&
                            ^         ~
   arch/arm/include/asm/signal.h:17:2: note: array 'sig' declared here
           unsigned long sig[_NSIG_WORDS];
           ^
   In file included from arch/arm/kernel/asm-offsets.c:12:
   In file included from include/linux/mm.h:700:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:6:
   include/linux/signal.h:113:27: warning: array index 3 is past the end of the array (which contains 2 elements) [-Warray-bounds]
                   return  (set1->sig[3] == set2->sig[3]) &&
                                            ^         ~
   arch/arm/include/asm/signal.h:17:2: note: array 'sig' declared here
           unsigned long sig[_NSIG_WORDS];
           ^
   In file included from arch/arm/kernel/asm-offsets.c:12:
   In file included from include/linux/mm.h:700:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:6:
   include/linux/signal.h:114:5: warning: array index 2 is past the end of the array (which contains 2 elements) [-Warray-bounds]
                           (set1->sig[2] == set2->sig[2]) &&
                            ^         ~
   arch/arm/include/asm/signal.h:17:2: note: array 'sig' declared here
           unsigned long sig[_NSIG_WORDS];
           ^
   In file included from arch/arm/kernel/asm-offsets.c:12:
   In file included from include/linux/mm.h:700:
   In file included from include/linux/huge_mm.h:8:


vim +/read_current_timer +19 arch/arm/include/asm/timex.h

    16	
    17	static inline unsigned long random_get_entropy(void)
    18	{
  > 19		unsigned long ret = get_cycles();
    20		if (ret)
    21			return ret;
    22		return sched_clock();
    23	}
    24	#define random_get_entropy random_get_entropy
    25	

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