Commit 046cc3dd authored by Song Liu's avatar Song Liu Committed by Alexei Starovoitov
Browse files

bpf: Fix build without CONFIG_STACKTRACE 



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

Fixes: fa28dcb8 ("bpf: Introduce helper bpf_get_task_stack()")
Reported-by: default avatarkernel test robot <lkp@intel.com>
Signed-off-by: default avatarSong Liu <songliubraving@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200703024537.79971-1-songliubraving@fb.com
parent 811d7e37

kernel/bpf/stackmap.c

+4 −0
Original line number Diff line number Diff line
@@ -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,

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