Hi all,

After merging the nfs tree, today's linux-next build (powerpc
ppc64_defconfig) produced this warning:

In file included from include/trace/define_trace.h:102,
                 from fs/nfs/nfs4trace.h:2316,
                 from fs/nfs/nfs4trace.c:13:
fs/nfs/./nfs4trace.h: In function 'trace_event_raw_event_nfs4_read_event':
fs/nfs/./nfs4trace.h:1767:34: warning: unused variable 'lo' [-Wunused-variable]
 1767 |    const struct pnfs_layout_hdr *lo = lseg ?
      |                                  ^~
include/trace/trace_events.h:707:4: note: in definition of macro 'DECLARE_EVENT_CLASS'
  707 |  { assign; }       \
      |    ^~~~~~
fs/nfs/./nfs4trace.h:1759:3: note: in expansion of macro 'TP_fast_assign'
 1759 |   TP_fast_assign(
      |   ^~~~~~~~~~~~~~
fs/nfs/./nfs4trace.h: In function 'trace_event_raw_event_nfs4_write_event':
fs/nfs/./nfs4trace.h:1844:34: warning: unused variable 'lo' [-Wunused-variable]
 1844 |    const struct pnfs_layout_hdr *lo = lseg ?
      |                                  ^~
include/trace/trace_events.h:707:4: note: in definition of macro 'DECLARE_EVENT_CLASS'
  707 |  { assign; }       \
      |    ^~~~~~
fs/nfs/./nfs4trace.h:1836:3: note: in expansion of macro 'TP_fast_assign'
 1836 |   TP_fast_assign(
      |   ^~~~~~~~~~~~~~
fs/nfs/./nfs4trace.h: In function 'trace_event_raw_event_nfs4_commit_event':
fs/nfs/./nfs4trace.h:1917:34: warning: unused variable 'lo' [-Wunused-variable]
 1917 |    const struct pnfs_layout_hdr *lo = lseg ?
      |                                  ^~
include/trace/trace_events.h:707:4: note: in definition of macro 'DECLARE_EVENT_CLASS'
  707 |  { assign; }       \
      |    ^~~~~~
fs/nfs/./nfs4trace.h:1911:3: note: in expansion of macro 'TP_fast_assign'
 1911 |   TP_fast_assign(
      |   ^~~~~~~~~~~~~~
In file included from include/trace/define_trace.h:103,
                 from fs/nfs/nfs4trace.h:2316,
                 from fs/nfs/nfs4trace.c:13:
fs/nfs/./nfs4trace.h: In function 'perf_trace_nfs4_read_event':
fs/nfs/./nfs4trace.h:1767:34: warning: unused variable 'lo' [-Wunused-variable]
 1767 |    const struct pnfs_layout_hdr *lo = lseg ?
      |                                  ^~
include/trace/perf.h:66:4: note: in definition of macro 'DECLARE_EVENT_CLASS'
   66 |  { assign; }       \
      |    ^~~~~~
fs/nfs/./nfs4trace.h:1759:3: note: in expansion of macro 'TP_fast_assign'
 1759 |   TP_fast_assign(
      |   ^~~~~~~~~~~~~~
fs/nfs/./nfs4trace.h: In function 'perf_trace_nfs4_write_event':
fs/nfs/./nfs4trace.h:1844:34: warning: unused variable 'lo' [-Wunused-variable]
 1844 |    const struct pnfs_layout_hdr *lo = lseg ?
      |                                  ^~
include/trace/perf.h:66:4: note: in definition of macro 'DECLARE_EVENT_CLASS'
   66 |  { assign; }       \
      |    ^~~~~~
fs/nfs/./nfs4trace.h:1836:3: note: in expansion of macro 'TP_fast_assign'
 1836 |   TP_fast_assign(
      |   ^~~~~~~~~~~~~~
fs/nfs/./nfs4trace.h: In function 'perf_trace_nfs4_commit_event':
fs/nfs/./nfs4trace.h:1917:34: warning: unused variable 'lo' [-Wunused-variable]
 1917 |    const struct pnfs_layout_hdr *lo = lseg ?
      |                                  ^~
include/trace/perf.h:66:4: note: in definition of macro 'DECLARE_EVENT_CLASS'
   66 |  { assign; }       \
      |    ^~~~~~
fs/nfs/./nfs4trace.h:1911:3: note: in expansion of macro 'TP_fast_assign'
 1911 |   TP_fast_assign(
      |   ^~~~~~~~~~~~~~

Introduced by commit

  34daa637f2b2 ("NFS: Add layout segment info to pnfs read/write/commit tracepoints")

-- 
Cheers,
Stephen Rothwell