perf tools: Convert to LIBUNWIND_SUPPORT

For building perf without libunwind, we can set NO_LIBUNWIND=1 as a
argument of make.  It then defines NO_LIBUNWIND_SUPPORT macro for C code
to do the proper handling.  However it usually used in a negative
semantics - e.g. #ifndef - so we saw double negations which can be
misleading.  Convert it to a positive form to make it more readable.

Also change NO_PERF_REGS macro to HAVE_PERF_REGS for the same reason.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1348824728-14025-5-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 7 insertions, 7 deletions

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index f14cb5fdb91f..8c029fe2e22c 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -33,11 +33,11 @@
 
 #define CALLCHAIN_HELP "do call-graph (stack chain/backtrace) recording: "
 
-#ifdef NO_LIBUNWIND_SUPPORT
-static char callchain_help[] = CALLCHAIN_HELP "[fp]";
-#else
+#ifdef LIBUNWIND_SUPPORT
 static unsigned long default_stack_dump_size = 8192;
 static char callchain_help[] = CALLCHAIN_HELP "[fp] dwarf";
+#else
+static char callchain_help[] = CALLCHAIN_HELP "[fp]";
 #endif
 
 enum write_mode_t {
@@ -800,7 +800,7 @@ error:
         return ret;
 }
 
-#ifndef NO_LIBUNWIND_SUPPORT
+#ifdef LIBUNWIND_SUPPORT
 static int get_stack_size(char *str, unsigned long *_size)
 {
         char *endptr;
@@ -826,7 +826,7 @@ static int get_stack_size(char *str, unsigned long *_size)
                max_size, str);
         return -1;
 }
-#endif /* !NO_LIBUNWIND_SUPPORT */
+#endif /* LIBUNWIND_SUPPORT */
 
 static int
 parse_callchain_opt(const struct option *opt __maybe_unused, const char *arg,
@@ -865,7 +865,7 @@ parse_callchain_opt(const struct option *opt __maybe_unused, const char *arg,
                                        "needed for -g fp\n");
                         break;
 
-#ifndef NO_LIBUNWIND_SUPPORT
+#ifdef LIBUNWIND_SUPPORT
                 /* Dwarf style */
                 } else if (!strncmp(name, "dwarf", sizeof("dwarf"))) {
                         ret = 0;
@@ -883,7 +883,7 @@ parse_callchain_opt(const struct option *opt __maybe_unused, const char *arg,
                         if (!ret)
                                 pr_debug("callchain: stack dump size %d\n",
                                          rec->opts.stack_dump_size);
-#endif /* !NO_LIBUNWIND_SUPPORT */
+#endif /* LIBUNWIND_SUPPORT */
                 } else {
                         pr_err("callchain: Unknown -g option "
                                "value: %s\n", arg);