Re: [PATCH, REPORT] bpf_trace: build error without PERF_EVENTS
From: Steven Rostedt
Date: Tue Nov 10 2015 - 09:25:13 EST
On Tue, 10 Nov 2015 14:31:38 +0100
Daniel Borkmann <daniel@xxxxxxxxxxxxx> wrote:
> On 11/10/2015 01:55 PM, Arnd Bergmann wrote:
> > In my ARM randconfig tests, I'm getting a build error for
> > newly added code in bpf_perf_event_read and bpf_perf_event_output
> > whenever CONFIG_PERF_EVENTS is disabled:
> > kernel/trace/bpf_trace.c: In function 'bpf_perf_event_read':
> > kernel/trace/bpf_trace.c:203:11: error: 'struct perf_event' has no member named 'oncpu'
> > if (event->oncpu != smp_processor_id() ||
> > ^
> > kernel/trace/bpf_trace.c:204:11: error: 'struct perf_event' has no member named 'pmu'
> > event->pmu->count)
> > This can happen when UPROBE_EVENT is enabled but KPROBE_EVENT
> > is disabled. I'm not sure if that is a configuration we care
> > about, otherwise we could prevent this case from occuring by
> > adding Kconfig dependencies.
> I think that seems better than spreading #if IS_ENABLEDs into the code.
> Probably enough to add a 'depends on PERF_EVENTS' to config BPF_EVENTS,
> so it's also explicitly documented.
So just do the following then?
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 8d6363f42169..f5aecff2d243 100644
@@ -434,7 +434,7 @@ config UPROBE_EVENT
depends on BPF_SYSCALL
- depends on KPROBE_EVENT || UPROBE_EVENT
+ depends on KPROBE_EVENT && UPROBE_EVENT
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