s390/sclp: add __nonstring annotation

Add __nonstring annotation, since the missing string termination for
id member of sclp_trace_entry is intended. This way we get rid of this
warning:

drivers/s390/char/sclp.c:84:9: warning: ‘strncpy’ output truncated before terminating nul copying 4 bytes from a string of the same length [-Wstringop-truncation]
   84 |         strncpy(e.id, id, sizeof(e.id));
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c
index b4b84e3..2cf7fe1 100644 (file)
--- a/drivers/s390/char/sclp.c
+++ b/drivers/s390/char/sclp.c
@@ -28,7 +28,7 @@
 #define SCLP_HEADER            "sclp: "
 
 struct sclp_trace_entry {
-       char id[4];
+       char id[4] __nonstring;
        u32 a;
        u64 b;
 };