[dm-devel] [PATCH v2 2/2] kpartx/devmapper.c: fix unused variable error

[Sergei Trofimovich]

Without the change the build fails as:

    devmapper.c:58:69: error: unused parameter 'udev_flags' [-Werror=unused-parameter]
       58 | int dm_simplecmd(int task, const char *name, int no_flush, uint16_t udev_flags)
          |                                                            ~~~~~~~~~^~~~~~~~~~

The change adds __attribute__((used)) annotation to unused function parameter.

CC: Martin Wilck <mwilck at suse.com>
CC: Benjamin Marzinski <bmarzins at redhat.com>
Signed-off-by: Sergei Trofimovich <slyich at gmail.com>
---
 kpartx/devmapper.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/kpartx/devmapper.c b/kpartx/devmapper.c
index 511c090f..49ffd310 100644
--- a/kpartx/devmapper.c
+++ b/kpartx/devmapper.c
@@ -18,6 +18,12 @@
 #define MAX_PREFIX_LEN (_UUID_PREFIX_LEN + 4)
 #define PARAMS_SIZE 1024
 
+#ifdef LIBDM_API_COOKIE
+#    define __DM_API_COOKIE_UNUSED__ /* empty */
+#else
+#    define __DM_API_COOKIE_UNUSED__ __attribute__((unused))
+#endif
+
 int dm_prereq(char * str, uint32_t x, uint32_t y, uint32_t z)
 {
 	int r = 1;
@@ -55,7 +61,7 @@ out:
 	return r;
 }
 
-int dm_simplecmd(int task, const char *name, int no_flush, uint16_t udev_flags)
+int dm_simplecmd(int task, const char *name, int no_flush, __DM_API_COOKIE_UNUSED__ uint16_t udev_flags)
 {
 	int r = 0;
 #ifdef LIBDM_API_COOKIE
-- 
2.34.1