The kernel would like to have all stack VLA usage removed[1]. Here the array is declared using a variable that is declared using a constant statement but the compiler still emits a warning. We can clear the warning bu using the constant statement directly. The buffer size variable is set to zero on the error path; the buffer size variable is used later in the function, we can maintain this behavior by setting the variable using the macro ARRAY_SIZE.
Use constant statement to declare array. [1]: https://lkml.org/lkml/2018/3/7/621 Signed-off-by: Tobin C. Harding <m...@tobin.cc> --- Excuse the lack of threading, I forgot the second patch ;) Can re-send threaded correctly if required. drivers/block/rbd.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 927ecd9a2511..7c228753fddd 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -3618,13 +3618,14 @@ static void __rbd_acknowledge_notify(struct rbd_device *rbd_dev, u64 notify_id, u64 cookie, s32 *result) { struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; - int buf_size = 4 + CEPH_ENCODING_START_BLK_LEN; - char buf[buf_size]; + char buf[4 + CEPH_ENCODING_START_BLK_LEN]; + int buf_size; int ret; if (result) { void *p = buf; + buf_size = ARRAY_SIZE(buf); /* encode ResponseMessage */ ceph_start_encoding(&p, 1, 1, buf_size - CEPH_ENCODING_START_BLK_LEN); -- 2.7.4
