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    SubjectRe: linux-next: build warnings from the build of Linus' tree
    Arnd Bergmann <arnd@arndb.de> 於 2018年8月24日 週五 下午8:48寫道:
    >
    > On Fri, Aug 24, 2018 at 10:23 AM Masami Hiramatsu <mhiramat@kernel.org> wrote:
    > >
    > > On Fri, 24 Aug 2018 13:32:06 +1000
    > > Stephen Rothwell <sfr@canb.auug.org.au> wrote:
    > >
    > > > Hi all,
    > > >
    > > > After merging the origin tree, today's linux-next build (powerpc
    > > > allyesconfig) produced these warnings:
    > > >
    > > > 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.
    >
    > Thje same commit causes a link failure on ARM with a randconfig
    > kernel (see https://pastebin.com/KspjpyKG for the .config):
    >
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_clock.o: defined in discarded section `.text.exit'
    > of kernel/trace/trace_clock.o
    > `_GLOBAL__sub_D_00100_1_trace_clock_local' referenced in section
    > `.fini_array.00100' of kernel/trace/trace_clock.o: defined in
    > discarded section `.text.exit' of kernel/trace/trace_clock.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/ftrace.o: defined in discarded section `.text.exit' of
    > kernel/trace/ftrace.o
    > `_GLOBAL__sub_D_00100_1_function_trace_op' referenced in section
    > `.fini_array.00100' of kernel/trace/ftrace.o: defined in discarded
    > section `.text.exit' of kernel/trace/ftrace.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/ring_buffer.o: defined in discarded section `.text.exit'
    > of kernel/trace/ring_buffer.o
    > `_GLOBAL__sub_D_00100_1_ring_buffer_print_entry_header' referenced in
    > section `.fini_array.00100' of kernel/trace/ring_buffer.o: defined in
    > discarded section `.text.exit' of kernel/trace/ring_buffer.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/ring_buffer_benchmark.o: defined in discarded section
    > `.text.exit' of kernel/trace/ring_buffer_benchmark.o
    > `_GLOBAL__sub_D_00100_1_ring_buffer_benchmark.c' referenced in section
    > `.fini_array.00100' of kernel/trace/ring_buffer_benchmark.o: defined
    > in discarded section `.text.exit' of
    > kernel/trace/ring_buffer_benchmark.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace.o: defined in discarded section `.text.exit' of
    > kernel/trace/trace.o
    > `_GLOBAL__sub_D_00100_1_ns2usecs' referenced in section
    > `.fini_array.00100' of kernel/trace/trace.o: defined in discarded
    > section `.text.exit' of kernel/trace/trace.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_output.o: defined in discarded section `.text.exit'
    > of kernel/trace/trace_output.o
    > `_GLOBAL__sub_D_00100_1_trace_event_sem' referenced in section
    > `.fini_array.00100' of kernel/trace/trace_output.o: defined in
    > discarded section `.text.exit' of kernel/trace/trace_output.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_seq.o: defined in discarded section `.text.exit' of
    > kernel/trace/trace_seq.o
    > `_GLOBAL__sub_D_00100_1_trace_print_seq' referenced in section
    > `.fini_array.00100' of kernel/trace/trace_seq.o: defined in discarded
    > section `.text.exit' of kernel/trace/trace_seq.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_stat.o: defined in discarded section `.text.exit'
    > of kernel/trace/trace_stat.o
    > `_GLOBAL__sub_D_00100_1_register_stat_tracer' referenced in section
    > `.fini_array.00100' of kernel/trace/trace_stat.o: defined in discarded
    > section `.text.exit' of kernel/trace/trace_stat.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_printk.o: defined in discarded section `.text.exit'
    > of kernel/trace/trace_printk.o
    > `_GLOBAL__sub_D_00100_1_trace_printk_control' referenced in section
    > `.fini_array.00100' of kernel/trace/trace_printk.o: defined in
    > discarded section `.text.exit' of kernel/trace/trace_printk.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_sched_switch.o: defined in discarded section
    > `.text.exit' of kernel/trace/trace_sched_switch.o
    > `_GLOBAL__sub_D_00100_1_tracing_start_cmdline_record' referenced in
    > section `.fini_array.00100' of kernel/trace/trace_sched_switch.o:
    > defined in discarded section `.text.exit' of
    > kernel/trace/trace_sched_switch.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_functions.o: defined in discarded section
    > `.text.exit' of kernel/trace/trace_functions.o
    > `_GLOBAL__sub_D_00100_1_ftrace_create_function_files' referenced in
    > section `.fini_array.00100' of kernel/trace/trace_functions.o: defined
    > in discarded section `.text.exit' of kernel/trace/trace_functions.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_preemptirq.o: defined in discarded section
    > `.text.exit' of kernel/trace/trace_preemptirq.o
    > `_GLOBAL__sub_D_00100_1___tracepoint_irq_disable' referenced in
    > section `.fini_array.00100' of kernel/trace/trace_preemptirq.o:
    > defined in discarded section `.text.exit' of
    > kernel/trace/trace_preemptirq.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_irqsoff.o: defined in discarded section
    > `.text.exit' of kernel/trace/trace_irqsoff.o
    > `_GLOBAL__sub_D_00100_1_start_critical_timings' referenced in section
    > `.fini_array.00100' of kernel/trace/trace_irqsoff.o: defined in
    > discarded section `.text.exit' of kernel/trace/trace_irqsoff.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_sched_wakeup.o: defined in discarded section
    > `.text.exit' of kernel/trace/trace_sched_wakeup.o
    > `_GLOBAL__sub_D_00100_1_trace_sched_wakeup.c' referenced in section
    > `.fini_array.00100' of kernel/trace/trace_sched_wakeup.o: defined in
    > discarded section `.text.exit' of kernel/trace/trace_sched_wakeup.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_hwlat.o: defined in discarded section `.text.exit'
    > of kernel/trace/trace_hwlat.o
    > `_GLOBAL__sub_D_00100_1_trace_hwlat_callback' referenced in section
    > `.fini_array.00100' of kernel/trace/trace_hwlat.o: defined in
    > discarded section `.text.exit' of kernel/trace/trace_hwlat.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_nop.o: defined in discarded section `.text.exit' of
    > kernel/trace/trace_nop.o
    > `_GLOBAL__sub_D_00100_1_nop_trace' referenced in section
    > `.fini_array.00100' of kernel/trace/trace_nop.o: defined in discarded
    > section `.text.exit' of kernel/trace/trace_nop.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_stack.o: defined in discarded section `.text.exit'
    > of kernel/trace/trace_stack.o
    > `_GLOBAL__sub_D_00100_1_stack_trace_max' referenced in section
    > `.fini_array.00100' of kernel/trace/trace_stack.o: defined in
    > discarded section `.text.exit' of kernel/trace/trace_stack.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_branch.o: defined in discarded section `.text.exit'
    > of kernel/trace/trace_branch.o
    > `_GLOBAL__sub_D_00100_1_enable_branch_tracing' referenced in section
    > `.fini_array.00100' of kernel/trace/trace_branch.o: defined in
    > discarded section `.text.exit' of kernel/trace/trace_branch.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_events.o: defined in discarded section `.text.exit'
    > of kernel/trace/trace_events.o
    > `_GLOBAL__sub_D_00100_1_event_mutex' referenced in section
    > `.fini_array.00100' of kernel/trace/trace_events.o: defined in
    > discarded section `.text.exit' of kernel/trace/trace_events.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_export.o: defined in discarded section `.text.exit'
    > of kernel/trace/trace_export.o
    > `_GLOBAL__sub_D_00100_1_ftrace_event_is_function' referenced in
    > section `.fini_array.00100' of kernel/trace/trace_export.o: defined in
    > discarded section `.text.exit' of kernel/trace/trace_export.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_event_perf.o: defined in discarded section
    > `.text.exit' of kernel/trace/trace_event_perf.o
    > `_GLOBAL__sub_D_00100_1_perf_trace_init' referenced in section
    > `.fini_array.00100' of kernel/trace/trace_event_perf.o: defined in
    > discarded section `.text.exit' of kernel/trace/trace_event_perf.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_events_filter.o: defined in discarded section
    > `.text.exit' of kernel/trace/trace_events_filter.o
    > `_GLOBAL__sub_D_00100_1_filter_parse_regex' referenced in section
    > `.fini_array.00100' of kernel/trace/trace_events_filter.o: defined in
    > discarded section `.text.exit' of kernel/trace/trace_events_filter.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_events_trigger.o: defined in discarded section
    > `.text.exit' of kernel/trace/trace_events_trigger.o
    > `_GLOBAL__sub_D_00100_1_trigger_data_free' referenced in section
    > `.fini_array.00100' of kernel/trace/trace_events_trigger.o: defined in
    > discarded section `.text.exit' of kernel/trace/trace_events_trigger.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/power-traces.o: defined in discarded section `.text.exit'
    > of kernel/trace/power-traces.o
    > `_GLOBAL__sub_D_00100_1___tracepoint_cpu_idle' referenced in section
    > `.fini_array.00100' of kernel/trace/power-traces.o: defined in
    > discarded section `.text.exit' of kernel/trace/power-traces.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/rpm-traces.o: defined in discarded section `.text.exit'
    > of kernel/trace/rpm-traces.o
    > `_GLOBAL__sub_D_00100_1___tracepoint_rpm_suspend' referenced in
    > section `.fini_array.00100' of kernel/trace/rpm-traces.o: defined in
    > discarded section `.text.exit' of kernel/trace/rpm-traces.o
    > `.text.exit' referenced in section `.ARM.exidx.text.exit' of
    > kernel/trace/trace_benchmark.o: defined in discarded section
    > `.text.exit' of kernel/trace/trace_benchmark.o
    > `_GLOBAL__sub_D_00100_1___tracepoint_benchmark_event' referenced in
    > section `.fini_array.00100' of kernel/trace/trace_benchmark.o: defined
    > in discarded section `.text.exit' of kernel/trace/trace_benchmark.o

    It seems, happened in nds32 with allmodconfig.

    gcc version: 8.0.1
    binutil version: 2.30.51.20180307

    greentime@atcsqa02:/sqa2s/greentime/v3-upstream/linux <next-4.19> $
    PATH=/sqa2s/greentime/v3-upstream/toolchain/nds32le-linux-glibc-v3-upstream2/bin:$PATH
    ARCH=nds32 CROSS_COMPILE=nds32le-linux- nds32le-linux-ld -EL
    --no-undefined -X --build-id -X -o .tmp_vmlinux1 -T
    ./arch/nds32/kernel/vmlinux.lds --whole-archive built-in.a
    --no-whole-archive --start-group lib/lib.a arch/nds32/lib/lib.a
    --end-group
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/ftrace.o: defined in discarded section `.text.exit' of
    kernel/trace/ftrace.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/ring_buffer.o: defined in discarded section `.text.exit'
    of kernel/trace/ring_buffer.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace.o: defined in discarded section `.text.exit' of
    kernel/trace/trace.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_output.o: defined in discarded section `.text.exit'
    of kernel/trace/trace_output.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_printk.o: defined in discarded section `.text.exit'
    of kernel/trace/trace_printk.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_functions.o: defined in discarded section
    `.text.exit' of kernel/trace/trace_functions.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_preemptirq.o: defined in discarded section
    `.text.exit' of kernel/trace/trace_preemptirq.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_irqsoff.o: defined in discarded section
    `.text.exit' of kernel/trace/trace_irqsoff.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_sched_wakeup.o: defined in discarded section
    `.text.exit' of kernel/trace/trace_sched_wakeup.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_hwlat.o: defined in discarded section `.text.exit'
    of kernel/trace/trace_hwlat.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_stack.o: defined in discarded section `.text.exit'
    of kernel/trace/trace_stack.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_functions_graph.o: defined in discarded section
    `.text.exit' of kernel/trace/trace_functions_graph.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/blktrace.o: defined in discarded section `.text.exit' of
    kernel/trace/blktrace.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_events.o: defined in discarded section `.text.exit'
    of kernel/trace/trace_events.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_export.o: defined in discarded section `.text.exit'
    of kernel/trace/trace_export.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_events_filter.o: defined in discarded section
    `.text.exit' of kernel/trace/trace_events_filter.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_events_trigger.o: defined in discarded section
    `.text.exit' of kernel/trace/trace_events_trigger.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/power-traces.o: defined in discarded section `.text.exit'
    of kernel/trace/power-traces.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_benchmark.o: defined in discarded section
    `.text.exit' of kernel/trace/trace_benchmark.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_selftest_dynamic.o: defined in discarded section
    `.text.exit' of kernel/trace/trace_selftest_dynamic.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_clock.o: defined in discarded section `.text.exit'
    of kernel/trace/trace_clock.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_seq.o: defined in discarded section `.text.exit' of
    kernel/trace/trace_seq.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_stat.o: defined in discarded section `.text.exit'
    of kernel/trace/trace_stat.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_sched_switch.o: defined in discarded section
    `.text.exit' of kernel/trace/trace_sched_switch.o
    `.text.exit' referenced in section `.dtors.65435' of
    kernel/trace/trace_nop.o: defined in discarded section `.text.exit' of
    kernel/trace/trace_nop.o

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