I am not sure why the -g option in record and top has no long_name
for it.

Example:
        # perf record --[TAB]
        --all-cpus          --count             --freq              --no-delay  
        --period            --realtime          --uid
        --branch-any        --cpu               --group             
--no-inherit        --per-thread        --stat              --verbose
        --branch-filter     --data              --mmap-pages        
--no-samples        --pid               --tid               --weight
        --call-graph        --event             --no-buildid        --(null)    
        --quiet             --timestamp
        --cgroup            --filter            --no-buildid-cache  --output    
        --raw-samples       --transaction

There is a --(null) here, it is not clear enough to user.

This patch add a "call-graph" long_name for it.

Verification:
        # perf record --[TAB]
        --all-cpus          --count             --freq              --no-delay  
        --per-thread        --stat              --verbose
        --branch-any        --cpu               --group             
--no-inherit        --pid               --tid               --weight
        --branch-filter     --data              --mmap-pages        
--no-samples        --quiet             --timestamp
        --call-graph        --event             --no-buildid        --output    
        --raw-samples       --transaction
        --cgroup            --filter            --no-buildid-cache  --period    
        --realtime          --uid

Signed-off-by: Dongsheng Yang <yangds.f...@cn.fujitsu.com>
---
 tools/perf/builtin-record.c | 2 +-
 tools/perf/builtin-top.c    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index c1c1200..7460c8f 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -844,7 +844,7 @@ const struct option record_options[] = {
                     perf_evlist__parse_mmap_pages),
        OPT_BOOLEAN(0, "group", &record.opts.group,
                    "put the counters into a counter group"),
-       OPT_CALLBACK_NOOPT('g', NULL, &record.opts,
+       OPT_CALLBACK_NOOPT('g', "call-graph", &record.opts,
                           NULL, "enables call-graph recording" ,
                           &record_callchain_opt),
        OPT_CALLBACK(0, "call-graph", &record.opts,
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 03d37a7..a734a1b 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1084,7 +1084,7 @@ int cmd_top(int argc, const char **argv, const char 
*prefix __maybe_unused)
                   " abort, in_tx, transaction"),
        OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
                    "Show a column with the number of samples"),
-       OPT_CALLBACK_NOOPT('g', NULL, &top.record_opts,
+       OPT_CALLBACK_NOOPT('g', "call-graph", &top.record_opts,
                           NULL, "enables call-graph recording",
                           &callchain_opt),
        OPT_CALLBACK(0, "call-graph", &top.record_opts,
-- 
1.8.2.1

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