[PATCH bpf-next] selftests/bpf: fix compilation error of bpf_iter_task_stack.c

[PATCH bpf-next] selftests/bpf: fix compilation error of bpf_iter_task_stack.c

[Song Liu]

selftests/bpf shows compilation error as

  libbpf: invalid relo for 'entries' in special section 0xfff2; forgot to
  initialize global var?..

Fix it by initializing 'entries' to zeros.

Fixes: c7568114bc56 ("selftests/bpf: Add bpf_iter test with bpf_get_task_stack()")
Reported-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
---
 tools/testing/selftests/bpf/progs/bpf_iter_task_stack.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/progs/bpf_iter_task_stack.c b/tools/testing/selftests/bpf/progs/bpf_iter_task_stack.c
index e40d32a2ed93d..65899cc71d535 100644
--- a/tools/testing/selftests/bpf/progs/bpf_iter_task_stack.c
+++ b/tools/testing/selftests/bpf/progs/bpf_iter_task_stack.c
@@ -7,7 +7,7 @@
 char _license[] SEC("license") = "GPL";
 
 #define MAX_STACK_TRACE_DEPTH   64
-unsigned long entries[MAX_STACK_TRACE_DEPTH];
+unsigned long entries[MAX_STACK_TRACE_DEPTH] = {0};
 #define SIZE_OF_ULONG (sizeof(unsigned long))
 
 SEC("iter/task")
-- 
2.24.1

Re: [PATCH bpf-next] selftests/bpf: fix compilation error of bpf_iter_task_stack.c

[Daniel Borkmann]

On 7/3/20 8:17 PM, Song Liu wrote:
> selftests/bpf shows compilation error as
> 
>    libbpf: invalid relo for 'entries' in special section 0xfff2; forgot to
>    initialize global var?..
> 
> Fix it by initializing 'entries' to zeros.
> 
> Fixes: c7568114bc56 ("selftests/bpf: Add bpf_iter test with bpf_get_task_stack()")
> Reported-by: Jesper Dangaard Brouer <brouer@redhat.com>
> Signed-off-by: Song Liu <songliubraving@fb.com>

Applied, thanks!