[PATCH kvmtool v2 3/4] util: Use __pr_debug() instead of pr_info() to print debug messages

[Alexandru Elisei <alexandru.elisei@xxxxxxx>]

pr_debug() is special, because it can be suppressed with a command line
argument, and because it needs to be a macro to capture the correct
filename, function name and line number. Display debug messages with the
prefix "Debug", to make it clear that those aren't informational messages.

Reviewed-by: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>
Signed-off-by: Alexandru Elisei <alexandru.elisei@xxxxxxx>
---
Changelog:

- Added Reviewed-by.
- Changed parameter name to the pr_debug functions to be "debug" instead of
  "info".

 include/kvm/util.h |  3 ++-
 util/util.c        | 15 +++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/include/kvm/util.h b/include/kvm/util.h
index f51f370d2b37..68d568d0fa9a 100644
--- a/include/kvm/util.h
+++ b/include/kvm/util.h
@@ -42,12 +42,13 @@ extern void die_perror(const char *s) NORETURN;
 extern void pr_err(const char *err, ...) __attribute__((format (printf, 1, 2)));
 extern void pr_warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 extern void pr_info(const char *err, ...) __attribute__((format (printf, 1, 2)));
+extern void __pr_debug(const char *debug, ...) __attribute__((format (printf, 1, 2)));
 extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 
 #define pr_debug(fmt, ...)						\
 	do {								\
 		if (do_debug_print)					\
-			pr_info("(%s) %s:%d: " fmt, __FILE__,		\
+			__pr_debug("(%s) %s:%d: " fmt, __FILE__,	\
 				__func__, __LINE__, ##__VA_ARGS__);	\
 	} while (0)
 
diff --git a/util/util.c b/util/util.c
index f59f26e1581c..7cf62edc3d34 100644
--- a/util/util.c
+++ b/util/util.c
@@ -38,6 +38,11 @@ static void info_builtin(const char *info, va_list params)
 	report(" Info: ", info, params);
 }
 
+static void debug_builtin(const char *debug, va_list params)
+{
+	report(" Debug: ", debug, params);
+}
+
 void die(const char *err, ...)
 {
 	va_list params;
@@ -74,6 +79,16 @@ void pr_info(const char *info, ...)
 	va_end(params);
 }
 
+/* Do not call directly; call pr_debug() instead. */
+void __pr_debug(const char *debug, ...)
+{
+	va_list params;
+
+	va_start(params, debug);
+	debug_builtin(debug, params);
+	va_end(params);
+}
+
 void die_perror(const char *s)
 {
 	perror(s);
-- 
2.41.0