----- On Oct 20, 2020, at 2:59 AM, lttng-dev <lttng-dev@lists.lttng.org> wrote:

Hi All,

I’m facing compilation error in build after pulling in the stable kernel LTS(4.14.y) commit - https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.14.y&id=77322edb99f0176ec67a300b9f263719ba391b89

Hi,

lttng-modules tracks the stable kernels through their versions (e.g. 4.14.165). There are ifdefs in the

lttng-modules code to choose the right instrumentation implementation based on the kernel version it is

built against.

Of course, if you don't follow the versioning scheme of the stable kernels and cherry-pick random commits,

there is little lttng-modules can do to track those changes. We have worked with Ubuntu, Redhat and Debian

distributions to ensure their kernels are versioned in a way which is also detected by lttng-modules, in the

situations where the kernels diverge from upstream. If you want to create your own kernel which also

differs from all other existing kernels out there, you will also need to take care of versioning it and adapt

lttng-modules accordingly.

Thanks,

Mathieu

I tried this solution - https://github.com/lttng/lttng-modules/commit/7318a1e88c8097733f5a05529069e4e03c142cae

But this also didn’t resolve my problem.

| In file included from /home/snaaz/elm/8up/main/build_zcu/tmp/work/zcu102_zynqmp_mel-mel-linux/lttng-modules/2.10.9-r0/lttng-modules-2.10.9/probes/../probes/define_trace.h💯0,

|                  from /home/snaaz/elm/8up/main/build_zcu/tmp/work/zcu102_zynqmp_mel-mel-linux/lttng-modules/2.10.9-r0/lttng-modules-2.10.9/probes/../instrumentation/events/lttng-module/writeback.h:735,

|                  from /home/snaaz/elm/8up/main/build_zcu/tmp/work/zcu102_zynqmp_mel-mel-linux/lttng-modules/2.10.9-r0/lttng-modules-2.10.9/probes/lttng-probe-writeback.c:51:

| /home/snaaz/elm/8up/main/build_zcu/tmp/work/zcu102_zynqmp_mel-mel-linux/lttng-modules/2.10.9-r0/lttng-modules-2.10.9/probes/../probes/lttng-tracepoint-event-impl.h:143:6: error: conflicting types for 'trace_writeback_queue_io'

| void trace_##_name(_proto);

|       ^

| /home/snaaz/elm/8up/main/build_zcu/tmp/work/zcu102_zynqmp_mel-mel-linux/lttng-modules/2.10.9-r0/lttng-modules-2.10.9/probes/../probes/lttng-tracepoint-event-impl.h:55:2: note: in expansion of macro 'LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP'

|   LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(map, name, map, PARAMS(proto), PARAMS(args))

|   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

| /home/snaaz/elm/8up/main/build_zcu/tmp/work/zcu102_zynqmp_mel-mel-linux/lttng-modules/2.10.9-r0/lttng-modules-2.10.9/probes/../probes/lttng-tracepoint-event-impl.h:97:2: note: in expansion of macro 'LTTNG_TRACEPOINT_EVENT_MAP'

|   LTTNG_TRACEPOINT_EVENT_MAP(name, name,    \

|   ^~~~~~~~~~~~~~~~~~~~~~~~~~

| /home/snaaz/elm/8up/main/build_zcu/tmp/work/zcu102_zynqmp_mel-mel-linux/lttng-modules/2.10.9-r0/lttng-modules-2.10.9/probes/../instrumentation/events/lttng-module/writeback.h:375:1: note: in expansion of macro 'LTTNG_TRACEPOINT_EVENT'

| LTTNG_TRACEPOINT_EVENT(writeback_queue_io,

| ^~~~~~~~~~~~~~~~~~~~~~

| In file included from /home/snaaz/elm/8up/main/build_zcu/tmp/work-shared/zcu102-zynqmp-mel/kernel-source/include/trace/events/writeback.h:8:0,

|                  from /home/snaaz/elm/8up/main/build_zcu/tmp/work/zcu102_zynqmp_mel-mel-linux/lttng-modules/2.10.9-r0/lttng-modules-2.10.9/probes/lttng-probe-writeback.c:33:

| /home/snaaz/elm/8up/main/build_zcu/tmp/work-shared/zcu102-zynqmp-mel/kernel-source/include/linux/tracepoint.h:187:21: note: previous definition of 'trace_writeback_queue_io' was here

|   static inline void trace_##name(proto)    \

|                      ^

| /home/snaaz/elm/8up/main/build_zcu/tmp/work-shared/zcu102-zynqmp-mel/kernel-source/include/linux/tracepoint.h:352:2: note: in expansion of macro '__DECLARE_TRACE'

|   __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \

|   ^~~~~~~~~~~~~~~

| /home/snaaz/elm/8up/main/build_zcu/tmp/work-shared/zcu102-zynqmp-mel/kernel-source/include/linux/tracepoint.h:488:2: note: in expansion of macro 'DECLARE_TRACE'

|   DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))

|   ^~~~~~~~~~~~~

| /home/snaaz/elm/8up/main/build_zcu/tmp/work-shared/zcu102-zynqmp-mel/kernel-source/include/trace/events/writeback.h:361:1: note: in expansion of macro 'TRACE_EVENT'

| TRACE_EVENT(writeback_queue_io,

Kindly look into it and do the needful. Thanks!

Regards,

Syeda Shagufta Naaz

Software Development Engineer | Mentor Embedded Linux

Mentor,A Siemens Business

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Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com