** Description changed:

  Issue found with Jammy 5.15.0-132.143 in sru-20250113
+ The same bug has been found in Focal 5.15.0-132.
  
  [Impact]
  
  lttng-modules-dkms does not compile from source in Jammy:
  
     CC [M]  
/var/lib/dkms/lttng-modules/2.13.8/build/src/lib/ringbuffer/ring_buffer_iterator.o
     CC [M]  
/var/lib/dkms/lttng-modules/2.13.8/build/src/probes/lttng-probe-kmem.o
   In file included from 
/var/lib/dkms/lttng-modules/2.13.8/build/src/probes/../../include/lttng/define_trace.h:87,
                    from 
/var/lib/dkms/lttng-modules/2.13.8/build/src/probes/../../include/instrumentation/events/kmem.h:570,
                    from 
/var/lib/dkms/lttng-modules/2.13.8/build/src/probes/lttng-probe-kmem.c:35:
   
/var/lib/dkms/lttng-modules/2.13.8/build/src/probes/../../include/lttng/tracepoint-event-impl.h:133:6:
 error: conflicting types for 'trace_mm_page_alloc_zone_locked'; have 
'void(struct page *, unsigned int,  int)'
     133 | void trace_##_name(_proto);
         |      ^~~~~~
   
/var/lib/dkms/lttng-modules/2.13.8/build/src/probes/../../include/instrumentation/events/kmem.h:438:1:
 note: in expansion of macro 'LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP'
     438 | LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(kmem_mm_page, 
mm_page_alloc_zone_locked,
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   In file included from ./include/trace/events/kmem.h:9,
                    from 
/var/lib/dkms/lttng-modules/2.13.8/build/src/probes/lttng-probe-kmem.c:24:
   ./include/linux/tracepoint.h:244:28: note: previous definition of 
'trace_mm_page_alloc_zone_locked' with type 'void(struct page *, unsigned int,  
int,  int)'
     244 |         static inline void trace_##name(proto)                       
   \
         |                            ^~~~~~
   ./include/linux/tracepoint.h:416:9: note: in expansion of macro 
'__DECLARE_TRACE'
     416 |         __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args),           
   \
         |         ^~~~~~~~~~~~~~~
   ./include/linux/tracepoint.h:539:9: note: in expansion of macro 
'DECLARE_TRACE'
     539 |         DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
         |         ^~~~~~~~~~~~~
   ./include/trace/events/kmem.h:259:1: note: in expansion of macro 
'DEFINE_EVENT'
     259 | DEFINE_EVENT(mm_page, mm_page_alloc_zone_locked,
         | ^~~~~~~~~~~~
   make[3]: *** [scripts/Makefile.build:297: 
/var/lib/dkms/lttng-modules/2.13.8/build/src/probes/lttng-probe-kmem.o] Error 1
  
  [ Test case ]
  
  Install lttng-modules-dkms:
  
  $ sudo apt install lttng-modules-dkms
  
  Load the module:
  
  $ sudo modprobe lttng-test
  
- The same procedure should be repeated on linux-5.15, the GA kernel, to
- test for possible regressions.
+ This procedure should be repeated for Jammy-GA and Jammy-HWE kernels,
+ and for Focal-GA, Focal-HWE kernels.
  
  [ Fix ]
  
  Patch the code to properly support 6.8 and 5.15 ABI.
  
  [ Regression potential ]
  
  We may experience regressions in systems that are using the lttng
  debugging tool.

-- 
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https://bugs.launchpad.net/bugs/2096645

Title:
  lttng DKMS failed to build on Jammy in sru-20250113 (error:
  conflicting types for 'trace_mm_page_alloc_zone_locked')

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