[lttng-dev] lttng-modules build error against linux 3.18.x longterm kernels

[Bjørn Forsman]

On 26 March 2015 at 23:11, Bjørn Forsman <bjorn.forsman at gmail.com> wrote:
> Hi all,
>
> (I'm not subscribed, please CC me.)
>
> Build error snippet:
>
> [...]
>  CC [M]  /tmp/nix-build-lttng-modules-2.6.0-5-g1b2a542-3.18.10.drv-0/lttng-modules-1b2a542/probes/lttng-probe-irq.o
>  CC [M]  /tmp/nix-build-lttng-modules-2.6.0-5-g1b2a542-3.18.10.drv-0/lttng-modules-1b2a542/probes/lttng-probe-timer.o
>  CC [M]  /tmp/nix-build-lttng-modules-2.6.0-5-g1b2a542-3.18.10.drv-0/lttng-modules-1b2a542/probes/lttng-probe-kmem.o
> In file included from
> /tmp/nix-build-lttng-modules-2.6.0-5-g1b2a542-3.18.10.drv-0/lttng-modules-1b2a542/probes/../instrumentation/events/lttng-module/../../../probes/define_trace.h:136:0,
>                 from
> /tmp/nix-build-lttng-modules-2.6.0-5-g1b2a542-3.18.10.drv-0/lttng-modules-1b2a542/probes/../instrumentation/events/lttng-module/kmem.h:466,
>                 from
> /tmp/nix-build-lttng-modules-2.6.0-5-g1b2a542-3.18.10.drv-0/lttng-modules-1b2a542/probes/lttng-probe-kmem.c:42:
> /tmp/nix-build-lttng-modules-2.6.0-5-g1b2a542-3.18.10.drv-0/lttng-modules-1b2a542/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-2.6.0-5-g1b2a542-3.18.10.drv-0/lttng-modules-1b2a542/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))
> [...]
>
> Build results from the NixOS build server[1] (which contains full
> logs) seems to indicate that this breakage started with the linux
> 3.18.9 -> 3.18.10 transition. Simultaneously, lttng-modules was
> updated 2.6.0-rc1 -> 2.6.0-5-g1b2a542 (latest on stable-2.6 branch),
> but I guess/hope that's not the reason for the error :-)
>
> [1]: http://hydra.nixos.org/job/nixos/trunk-combined/nixpkgs.linuxPackages_3_18.lttng-modules.i686-linux

So apparantly this is fixed in master:
http://lists.lttng.org/pipermail/lttng-dev/2015-April/024395.html

Are you planning to backport the fix to stable-2.6? And possibly make
a release? (Speaking as a distro packager here.)

Best regards,
Bjørn Forsman