Re: [PATCH] bpf_trace: Make dependent on PERF_EVENTS

From: Arnd Bergmann
Date: Tue Nov 10 2015 - 15:41:46 EST

On Tuesday 10 November 2015 15:28:17 Steven Rostedt wrote:
> Arnd Bergmann reported:
> 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.
> Looking at this further, it's really that UPROBE_EVENT enables PERF_EVENTS.
> By just having BPF_EVENTS depend on PERF_EVENTS, then all is fine.
> Link: 4525348.Aq9YoXkChv@wuerfel">
> Reported-by: Arnd Bergmann <arnd@xxxxxxxx>
> Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>

Ok, sounds good.

Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
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