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| author | Yonghong Song <yhs@fb.com> | 2019-06-25 17:35:03 -0700 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2019-06-26 14:44:07 +0200 |
| commit | 9db1ff0a415c7de8eb67df5b2c56ac409ccefc37 (patch) | |
| tree | 57c28eb0281ef0cf406d7f0a3c41db4969499c0e /kernel/trace | |
| parent | 6bcc617f842cdb5f3d66b3a3f06614a62fab992b (diff) | |
| download | linux-9db1ff0a415c7de8eb67df5b2c56ac409ccefc37.tar.gz | |
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: 8b401f9ed244 ("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>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/bpf_trace.c | 27 |
1 files changed, 14 insertions, 13 deletions
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index c102c240bb0b..ca1255d14576 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -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 */ |