perf trace: Fix build when DWARF unwind isn't available
tip-bot for Arnaldo Carvalho de Melo
merge botCommit-ID: ccd62a896ffe3dbd60f3b7570a2b74e4fe030ed6 Gitweb: http://git.kernel.org/tip/ccd62a896ffe3dbd60f3b7570a2b74e4fe030ed6 Author: Arnaldo Carvalho de Melo <[email protected]> AuthorDate: Sat, 16 Apr 2016 09:36:32 -0300 Committer: Arnaldo Carvalho de Melo <[email protected]> CommitDate: Sat, 16 Apr 2016 09:44:28 -0300
perf trace: Fix build when DWARF unwind isn't available
The variable is initialized and then conditionally set to a different value, but not used when DWARF unwinding is not available, bummer, write 1000 times: "Run make -C tools/perf build-test"...
builtin-trace.c: In function ‘cmd_trace’:
builtin-trace.c:3112:6: error: variable ‘max_stack_user_set’ set but not used [-Werror=unused-but-set-variable]
bool max_stack_user_set = true;
^cc1: all warnings being treated as err
Fix it by marking it as __maybe_unused.
Cc Adrian Hunter <[email protected]>
Cc David Ahern <[email protected]>
Cc Jiri Olsa <[email protected]>
Cc Milian Wolff <[email protected]>
Cc Namhyung Kim <[email protected]>
Cc Wang Nan <[email protected]>
Fixes 056149932602 ("perf trace: Make --(min,max}-stack imply "--call-graph dwarf"")
Signed-off-by Arnaldo Carvalho de Melo <[email protected]>
--- tools/perf/builtin-trace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
tools/perf/builtin-trace.c +1 -1
@@ -3109,7 +3109,7 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused) "per thread proc mmap processing timeout in ms"), OPT_END() }; -bool max_stack_user_set = true; +bool __maybe_unused max_stack_user_set = true;bool mmap_pages_user_set = true;const char *const trace_subcommands[] = {"record" ,NULL };int err;