s390/fcx: replace zero-length array with flexible-array member

Zero-length arrays are deprecated [1] and have to be replaced by C99
flexible-array members.

This helps with the ongoing efforts to tighten the FORTIFY_SOURCE routines
on memcpy() and help to make progress towards globally enabling
-fstrict-flex-arrays=3 [2]

Link: https://github.com/KSPP/linux/issues/78
Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/ZC7XT5prvoE4Yunm@work
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

diff --git a/arch/s390/include/asm/fcx.h b/arch/s390/include/asm/fcx.h
index b8a028a..29784b4 100644 (file)
--- a/arch/s390/include/asm/fcx.h
+++ b/arch/s390/include/asm/fcx.h
@@ -286,7 +286,7 @@ struct tccb_tcat {
  */
 struct tccb {
        struct tccb_tcah tcah;
-       u8 tca[0];
+       u8 tca[];
 } __attribute__ ((packed, aligned(8)));
 
 struct tcw *tcw_get_intrg(struct tcw *tcw);