Hi all, After merging the tip tree, today's linux-next build (powerpc64le perf) failed like this: builtin-trace.c: In function 'cmd_trace': builtin-trace.c:3112:7: error: variable 'max_stack_user_set' set but not used [-Werror=unused-but-set-variable] bool max_stack_user_set = true; ^ Caused by commit 056149932602 ("perf trace: Make --(min,max}-stack imply "--call-graph dwarf"") I added the following patch for today: From: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> Date: Mon, 18 Apr 2016 12:56:48 +1000 Subject: [PATCH] perf: trace: fix build when HAVE_DWARF_UNWIND_SUPPORT is not set Fixes: 056149932602 ("perf trace: Make --(min,max}-stack imply "--call-graph dwarf"") Signed-off-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> --- tools/perf/builtin-trace.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 026ec0c749b0..48dc23a4f405 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -3109,7 +3109,9 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused) "per thread proc mmap processing timeout in ms"), OPT_END() }; +#ifdef HAVE_DWARF_UNWIND_SUPPORT bool max_stack_user_set = true; +#endif bool mmap_pages_user_set = true; const char * const trace_subcommands[] = { "record", NULL }; int err; @@ -3149,7 +3151,9 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused) if (trace.max_stack == UINT_MAX) { trace.max_stack = PERF_MAX_STACK_DEPTH; +#ifdef HAVE_DWARF_UNWIND_SUPPORT max_stack_user_set = false; +#endif } #ifdef HAVE_DWARF_UNWIND_SUPPORT -- 2.7.0 -- Cheers, Stephen Rothwell -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html