* [PATCH bpf-next] bpf: fix compiler warning with CONFIG_MODULES=n
@ 2019-06-26 0:35 Yonghong Song
2019-06-26 1:16 ` Song Liu
2019-06-26 14:32 ` Daniel Borkmann
0 siblings, 2 replies; 3+ messages in thread
From: Yonghong Song @ 2019-06-26 0:35 UTC (permalink / raw)
To: ast, daniel, netdev, bpf; +Cc: kernel-team, arnd
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>
---
kernel/trace/bpf_trace.c | 27 ++++++++++++++-------------
1 file 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 */
--
2.17.1
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH bpf-next] bpf: fix compiler warning with CONFIG_MODULES=n
2019-06-26 0:35 [PATCH bpf-next] bpf: fix compiler warning with CONFIG_MODULES=n Yonghong Song
@ 2019-06-26 1:16 ` Song Liu
2019-06-26 14:32 ` Daniel Borkmann
1 sibling, 0 replies; 3+ messages in thread
From: Song Liu @ 2019-06-26 1:16 UTC (permalink / raw)
To: Yonghong Song
Cc: Alexei Starovoitov, Daniel Borkmann, Networking,
bpf@vger.kernel.org, Kernel Team, arnd@arndb.de
> On Jun 25, 2019, at 5:35 PM, Yonghong Song <yhs@fb.com> wrote:
>
> 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>
Thanks for the fix!
Acked-by: Song Liu <songliubraving@fb.com>
> ---
> kernel/trace/bpf_trace.c | 27 ++++++++++++++-------------
> 1 file 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 */
> --
> 2.17.1
>
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH bpf-next] bpf: fix compiler warning with CONFIG_MODULES=n
2019-06-26 0:35 [PATCH bpf-next] bpf: fix compiler warning with CONFIG_MODULES=n Yonghong Song
2019-06-26 1:16 ` Song Liu
@ 2019-06-26 14:32 ` Daniel Borkmann
1 sibling, 0 replies; 3+ messages in thread
From: Daniel Borkmann @ 2019-06-26 14:32 UTC (permalink / raw)
To: Yonghong Song, ast, netdev, bpf; +Cc: kernel-team, arnd
On 06/26/2019 02:35 AM, Yonghong Song wrote:
> 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>
Applied, thanks!
^ permalink raw reply [flat|nested] 3+ messages in thread
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2019-06-26 0:35 [PATCH bpf-next] bpf: fix compiler warning with CONFIG_MODULES=n Yonghong Song
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2019-06-26 14:32 ` Daniel Borkmann
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