[lttng-dev] lttng-modules no longer build against linux 3.14.x longterm kernels

[Bjørn Forsman]

Hi list,

(I'm not subscribed, please CC me.)

The breakage started with linux 3.14.36. Here is the build error, with
lttng-modules from master branch (stable-2.6 branch is also affected):

...
  LD [M]  /tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules/lib/lttng-lib-ring-buffer.o
/tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules/probes/Makefile:214:
CONFIG_KALLSYMS_ALL is disabled,
therefore probe "writeback" is disabled. Rebuild your kernel with this
configuration option enabled in order to trace this subsystem.
 CC [M]  /tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules/probes/lttng-types.o
 CC [M]  /tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules/probes/lttng-probe-sched.o
 CC [M]  /tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules/probes/lttng-probe-irq.o
 CC [M]  /tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules/probes/lttng-probe-timer.o
 CC [M]  /tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules/probes/lttng-probe-kmem.o
In file included from
/tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules/probes/../instrumentation/events
/lttng-module/../../../probes/define_trace.h:136:0,
                from
/tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules/probes/../instrumentation/events
/lttng-module/kmem.h:465,
                from
/tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules/probes/lttng-probe-kmem.c:42:
/tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules/probes/../instrumentation/events/lttng-module/../../..
/probes/lttng-events.h:180:6: error: conflicting types for
'trace_mm_page_alloc_extfrag'
void trace_##_name(_proto);
     ^
/tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules/probes/../instrumentation/events/lttng-module/../../..
/probes/lttng-events.h:47:2: note: in expansion of macro
'LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP'
 LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(map, name, map, PARAMS(proto),
PARAMS(args))
 ^
/tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules/probes/../instrumentation/events/lttng-module/../../..
/probes/lttng-events.h:107:2: note: in expansion of macro
'LTTNG_TRACEPOINT_EVENT_MAP'
 LTTNG_TRACEPOINT_EVENT_MAP(name, name,    \
 ^
/tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules/probes/../instrumentation/events/lttng-module/../../..
/probes/../instrumentation/events/lttng-module/kmem.h:334:1: note: in
expansion of macro 'LTTNG_TRACEPOINT_EVENT'
LTTNG_TRACEPOINT_EVENT(mm_page_alloc_extfrag,
^
In file included from
/nix/store/5ib7vccbi3mj9y0hr0snas00lagjbai1-linux-3.14.36-dev/lib/modules/3.14.36/source/include/linux/module.h
:18:0,
                from
/tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules/probes/lttng-probe-kmem.c:24:
/nix/store/5ib7vccbi3mj9y0hr0snas00lagjbai1-linux-3.14.36-dev/lib/modules/3.14.36/source/include/linux/tracepoint.h:168:21:
note: pre
vious definition of 'trace_mm_page_alloc_extfrag' was here
 static inline void trace_##name(proto)    \
                    ^
/nix/store/5ib7vccbi3mj9y0hr0snas00lagjbai1-linux-3.14.36-dev/lib/modules/3.14.36/source/include/linux/tracepoint.h:265:3:
note: in e
xpansion of macro '__DECLARE_TRACE'
  __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), 1, \
  ^
/nix/store/5ib7vccbi3mj9y0hr0snas00lagjbai1-linux-3.14.36-dev/lib/modules/3.14.36/source/include/linux/tracepoint.h:399:2:
note: in e
xpansion of macro 'DECLARE_TRACE'
 DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
 ^
/nix/store/5ib7vccbi3mj9y0hr0snas00lagjbai1-linux-3.14.36-dev/lib/modules/3.14.36/source/include/trace/events/kmem.h:267:1:
note: in
expansion of macro 'TRACE_EVENT'
TRACE_EVENT(mm_page_alloc_extfrag,
^
/nix/store/5ib7vccbi3mj9y0hr0snas00lagjbai1-linux-3.14.36-dev/lib/modules/3.14.36/source/scripts/Makefile.build:314:
recipe for targe
t '/tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules/probes/lttng-probe-kmem.o'
failed
make[5]: *** [/tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules/probes/lttng-probe-kmem.o]
Error 1
/nix/store/5ib7vccbi3mj9y0hr0snas00lagjbai1-linux-3.14.36-dev/lib/modules/3.14.36/source/scripts/Makefile.build:455:
recipe for targe
t '/tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules/probes'
failed
make[4]: *** [/tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules/probes]
Error 2
/nix/store/5ib7vccbi3mj9y0hr0snas00lagjbai1-linux-3.14.36-dev/lib/modules/3.14.36/source/Makefile:1276:
recipe for target '_module_/t
mp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules'
failed
make[3]: *** [_module_/tmp/nix-build-lttng-modules-2.6.0-rc1-20-g99a570c-3.14.36.drv-0/lttng-modules]
Error 2
Makefile:133: recipe for target 'sub-make' failed
make[2]: *** [sub-make] Error 2
Makefile:26: recipe for target 'all' failed
make[1]: *** [all] Error 2
make[1]: Leaving directory
'/nix/store/5ib7vccbi3mj9y0hr0snas00lagjbai1-linux-3.14.36-dev/lib/modules/3.14.36/build'
Makefile:70: recipe for target 'default' failed
make: *** [default] Error 2

Best regards,
Bjørn Forsman