linux-next: build failure after merge of the tip tree

[Stephen Rothwell]

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 <s...@canb.auug.org.au>
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 <s...@canb.auug.org.au>
---
 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