* [bpf-next] bpf: fix build without CONFIG_STACKTRACE
@ 2020-07-03 2:45 Song Liu
2020-07-03 3:30 ` Alexei Starovoitov
0 siblings, 1 reply; 2+ messages in thread
From: Song Liu @ 2020-07-03 2:45 UTC (permalink / raw)
To: bpf, netdev
Cc: ast, daniel, kernel-team, john.fastabend, kpsingh, Song Liu,
kernel test robot
Without CONFIG_STACKTRACE stack_trace_save_tsk() is not defined. Let
get_callchain_entry_for_task() to always return NULL in such cases.
Fixes: fa28dcb82a38 ("bpf: Introduce helper bpf_get_task_stack()")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
---
kernel/bpf/stackmap.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
index 5ad72ab2276b3..a6c361ed7937b 100644
--- a/kernel/bpf/stackmap.c
+++ b/kernel/bpf/stackmap.c
@@ -351,6 +351,7 @@ static void stack_map_get_build_id_offset(struct bpf_stack_build_id *id_offs,
static struct perf_callchain_entry *
get_callchain_entry_for_task(struct task_struct *task, u32 init_nr)
{
+#ifdef CONFIG_STACKTRACE
struct perf_callchain_entry *entry;
int rctx;
@@ -380,6 +381,9 @@ get_callchain_entry_for_task(struct task_struct *task, u32 init_nr)
put_callchain_entry(rctx);
return entry;
+#else /* CONFIG_STACKTRACE */
+ return NULL;
+#endif
}
BPF_CALL_3(bpf_get_stackid, struct pt_regs *, regs, struct bpf_map *, map,
--
2.24.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [bpf-next] bpf: fix build without CONFIG_STACKTRACE
2020-07-03 2:45 [bpf-next] bpf: fix build without CONFIG_STACKTRACE Song Liu
@ 2020-07-03 3:30 ` Alexei Starovoitov
0 siblings, 0 replies; 2+ messages in thread
From: Alexei Starovoitov @ 2020-07-03 3:30 UTC (permalink / raw)
To: Song Liu
Cc: bpf, Network Development, Alexei Starovoitov, Daniel Borkmann,
Kernel Team, John Fastabend, KP Singh, kernel test robot
On Thu, Jul 2, 2020 at 7:45 PM Song Liu <songliubraving@fb.com> wrote:
>
> Without CONFIG_STACKTRACE stack_trace_save_tsk() is not defined. Let
> get_callchain_entry_for_task() to always return NULL in such cases.
>
> Fixes: fa28dcb82a38 ("bpf: Introduce helper bpf_get_task_stack()")
> Reported-by: kernel test robot <lkp@intel.com>
> Signed-off-by: Song Liu <songliubraving@fb.com>
Applied. Thanks
^ permalink raw reply [flat|nested] 2+ messages in thread
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