linux-kernel - Re: linux-next: build warnings from the build of Linus' tree

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Date:   Fri, 24 Aug 2018 17:20:53 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: build warnings from the build of Linus' tree

On Fri, 24 Aug 2018 13:32:06 +1000
Stephen Rothwell <sfr@...b.auug.org.au> wrote:

> Hi all,
> 
> After merging the origin tree, today's linux-next build (powerpc
> allyesconfig) produced these warnings:
> 
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_selftest_dynamic.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_kprobe_selftest.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_clock.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/ftrace.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/ring_buffer.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/ring_buffer_benchmark.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_output.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_seq.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_stat.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_printk.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/tracing_map.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_sched_switch.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_functions.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_preemptirq.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_irqsoff.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_sched_wakeup.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_hwlat.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_nop.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_stack.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_functions_graph.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/blktrace.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_events.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_export.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_syscalls.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_event_perf.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_events_filter.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_events_trigger.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_events_hist.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/bpf_trace.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_kprobe.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/power-traces.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/rpm-traces.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_kdb.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_probe.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_uprobe.o' being placed in section `.data..LPBX1'
> ld: warning: orphan section `.data..LPBX1' from `kernel/trace/trace_benchmark.o' being placed in section `.data..LPBX1'
> 
> Maybe introduced by commit
> 
>   6b7dca401cb1 ("tracing: Allow gcov profiling on only ftrace subsystem")
> 
> I am guessing, but that is the only new thing that affects all of
> kernel/trace ...

Yes, I agree. But I just followed Documentation/dev-tools/gcov.rst
to enable profiling in kernel/trace. Hmm, doesn't ppc64 support
GCOV_PROFILE?  (But as far as I can see, ARCH_HAS_GCOV_PROFILE_ALL
is enabled in arch/powerpc/Kconfig)

Anyway, I'll try to reproduce it.

Thanks,

-- 
Masami Hiramatsu <mhiramat@...nel.org>