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bpf: fix compiler warning with CONFIG_MODULES=n 

With CONFIG_MODULES=n, the following compiler warning occurs:
  /data/users/yhs/work/net-next/kernel/trace/bpf_trace.c:605:13: warning:
      ‘do_bpf_send_signal’ defined but not used [-Wunused-function]
  static void do_bpf_send_signal(struct irq_work *entry)

The __init function send_signal_irq_work_init(), which calls
do_bpf_send_signal(), is defined under CONFIG_MODULES. Hence,
when CONFIG_MODULES=n, nobody calls static function do_bpf_send_signal(),
hence the warning.

The init function send_signal_irq_work_init() should work without
CONFIG_MODULES. Moving it out of CONFIG_MODULES
code section fixed the compiler warning, and also make bpf_send_signal()
helper work without CONFIG_MODULES.

Fixes: 8b401f9ed2 ("bpf: implement bpf_send_signal() helper")
Reported-By: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Yonghong Song 2019-06-25 17:35:03 -07:00 committed by Daniel Borkmann
parent 6bcc617f84
commit 9db1ff0a41
1 changed files with 14 additions and 13 deletions
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27
kernel/trace/bpf_trace.c
View File

@ -1431,6 +1431,20 @@ int bpf_get_perf_event_info(const struct perf_event *event, u32 *prog_id,
return err;
}
static int __init send_signal_irq_work_init(void)
{
int cpu;
struct send_signal_irq_work *work;
for_each_possible_cpu(cpu) {
work = per_cpu_ptr(&send_signal_work, cpu);
init_irq_work(&work->irq_work, do_bpf_send_signal);
}
return 0;
}
subsys_initcall(send_signal_irq_work_init);
#ifdef CONFIG_MODULES
static int bpf_event_notify(struct notifier_block *nb, unsigned long op,
void *module)
@ -1478,18 +1492,5 @@ static int __init bpf_event_init(void)
return 0;
}
static int __init send_signal_irq_work_init(void)
{
int cpu;
struct send_signal_irq_work *work;
for_each_possible_cpu(cpu) {
work = per_cpu_ptr(&send_signal_work, cpu);
init_irq_work(&work->irq_work, do_bpf_send_signal);
}
return 0;
}
fs_initcall(bpf_event_init);
subsys_initcall(send_signal_irq_work_init);
#endif /* CONFIG_MODULES */