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bpf: Fix build without CONFIG_STACKTRACE

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Without CONFIG_STACKTRACE stack_trace_save_tsk() is not defined. Let
get_callchain_entry_for_task() to always return NULL in such cases.

Fixes: fa28dcb82a ("bpf: Introduce helper bpf_get_task_stack()")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200703024537.79971-1-songliubraving@fb.com
This commit is contained in:
Song Liu 2020-07-02 19:45:37 -07:00 committed by Alexei Starovoitov
parent 811d7e375d
commit 046cc3dd9a
1 changed files with 4 additions and 0 deletions
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4
kernel/bpf/stackmap.c
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@ -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,