arch/powerpc/platforms/microwatt/rng.c:17:5: error: no previous prototype for 'microwatt_get_random_darn'

From: kernel test robot
Date: Thu Nov 11 2021 - 16:37:01 EST


tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: debe436e77c72fcee804fb867f275e6d31aa999c
commit: c25769fddaec13509b6cdc7ad17458f239c4cee7 powerpc/microwatt: Add support for hardware random number generator
date: 5 months ago
config: powerpc64-buildonly-randconfig-r002-20210929 (attached as .config)
compiler: powerpc64le-linux-gcc (GCC) 11.2.0
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
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c25769fddaec13509b6cdc7ad17458f239c4cee7
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout c25769fddaec13509b6cdc7ad17458f239c4cee7
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=powerpc

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

All errors (new ones prefixed by >>):

>> arch/powerpc/platforms/microwatt/rng.c:17:5: error: no previous prototype for 'microwatt_get_random_darn' [-Werror=missing-prototypes]
17 | int microwatt_get_random_darn(unsigned long *v)
| ^~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors


vim +/microwatt_get_random_darn +17 arch/powerpc/platforms/microwatt/rng.c

16
> 17 int microwatt_get_random_darn(unsigned long *v)
18 {
19 unsigned long val;
20
21 /* Using DARN with L=1 - 64-bit conditioned random number */
22 asm volatile(PPC_DARN(%0, 1) : "=r"(val));
23
24 if (val == DARN_ERR)
25 return 0;
26
27 *v = val;
28
29 return 1;
30 }
31

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

Attachment: .config.gz
Description: application/gzip