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Groups > linux.kernel > #1266658
| From | Alexei Starovoitov <alexei.starovoitov@gmail.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH, REPORT] bpf_trace: build error without PERF_EVENTS |
| Date | 2015-11-10 18:20 +0100 |
| Message-ID | <qtkKn-7Wr-23@gated-at.bofh.it> (permalink) |
| References | <qtgQq-5uz-9@gated-at.bofh.it> <qthjr-5Fv-9@gated-at.bofh.it> <qti5Q-6bC-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Tue, Nov 10, 2015 at 09:25:01AM -0500, Steven Rostedt wrote: > On Tue, 10 Nov 2015 14:31:38 +0100 > Daniel Borkmann <daniel@iogearbox.net> 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? > > -- Steve > > diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig > index 8d6363f42169..f5aecff2d243 100644 > --- a/kernel/trace/Kconfig > +++ b/kernel/trace/Kconfig > @@ -434,7 +434,7 @@ config UPROBE_EVENT > > config BPF_EVENTS > depends on BPF_SYSCALL > - depends on KPROBE_EVENT || UPROBE_EVENT > + depends on KPROBE_EVENT && UPROBE_EVENT yeah that's definitely cleaner and avoids ifdef creep in the future. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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[PATCH, REPORT] bpf_trace: build error without PERF_EVENTS Arnd Bergmann <arnd@arndb.de> - 2015-11-10 14:10 +0100
Re: [PATCH, REPORT] bpf_trace: build error without PERF_EVENTS Daniel Borkmann <daniel@iogearbox.net> - 2015-11-10 14:40 +0100
Re: [PATCH, REPORT] bpf_trace: build error without PERF_EVENTS Steven Rostedt <rostedt@goodmis.org> - 2015-11-10 15:30 +0100
Re: [PATCH, REPORT] bpf_trace: build error without PERF_EVENTS Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-11-10 18:20 +0100
Re: [PATCH, REPORT] bpf_trace: build error without PERF_EVENTS Daniel Borkmann <daniel@iogearbox.net> - 2015-11-10 18:30 +0100
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