4:49 a.m.
Hi Yonghong,
I love your patch! Perhaps something to improve:
[auto build test WARNING on bpf-next/master]
url:
https://github.com/0day-ci/linux/commits/Yonghong-Song/bpf-implement-bpf-...
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: arc-allyesconfig (attached as .config)
compiler: arc-elf-gcc (GCC) 9.3.0
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
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com>
All warnings (new ones prefixed by >>):
kernel/bpf/arraymap.c: In function '__bpf_array_map_seq_show':
> kernel/bpf/arraymap.c:540:20: warning: variable 'array'
set but not used [-Wunused-but-set-variable]
540 | struct bpf_array *array;
| ^~~~~
In file included from include/linux/perf_event.h:25,
from kernel/bpf/arraymap.c:11:
At top level:
arch/arc/include/asm/perf_event.h:126:23: warning: 'arc_pmu_cache_map' defined
but not used [-Wunused-const-variable=]
126 | static const unsigned arc_pmu_cache_map[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
| ^~~~~~~~~~~~~~~~~
arch/arc/include/asm/perf_event.h:91:27: warning: 'arc_pmu_ev_hw_map' defined
but not used [-Wunused-const-variable=]
91 | static const char * const arc_pmu_ev_hw_map[] = {
| ^~~~~~~~~~~~~~~~~
vim +/array +540 kernel/bpf/arraymap.c
533
534 static int __bpf_array_map_seq_show(struct seq_file *seq, void *v)
535 {
536 struct bpf_iter_seq_array_map_info *info = seq->private;
537 struct bpf_iter__bpf_map_elem ctx = {};
538 struct bpf_map *map = info->map;
539 struct bpf_iter_meta meta;
540 struct bpf_array *array;
541 struct bpf_prog *prog;
542 int off = 0, cpu = 0;
543 void __percpu **pptr;
544 u32 size;
545
546 meta.seq = seq;
547 prog = bpf_iter_get_info(&meta, v == NULL);
548 if (!prog)
549 return 0;
550
551 ctx.meta = &meta;
552 ctx.map = info->map;
553 if (v) {
554 ctx.key = &info->index;
555
556 array = container_of(map, struct bpf_array, map);
557 if (!info->percpu_value_buf) {
558 ctx.value = v;
559 } else {
560 pptr = v;
561 size = round_up(map->value_size, 8);
562 for_each_possible_cpu(cpu) {
563 bpf_long_memcpy(info->percpu_value_buf + off,
564 per_cpu_ptr(pptr, cpu),
565 size);
566 off += size;
567 }
568 ctx.value = info->percpu_value_buf;
569 }
570 }
571
572 return bpf_iter_run_prog(prog, &ctx);
573 }
574
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org