Define a macro to be reused in the different parts of the code.

Useful for the next patches where we add more arrays to manage also
translations with user VA.

Suggested-by: Eugenio Perez Martin <[email protected]>
Signed-off-by: Stefano Garzarella <[email protected]>
---

Notes:
    v4:
    - added this patch with the changes extracted from the next patch [Eugenio]
    - used _STRIDE instead of _SIZE [Eugenio]

 drivers/vhost/vringh.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c
index 0ba3ef809e48..4aee230f7622 100644
--- a/drivers/vhost/vringh.c
+++ b/drivers/vhost/vringh.c
@@ -1141,13 +1141,15 @@ static int iotlb_translate(const struct vringh *vrh,
        return ret;
 }
 
+#define IOTLB_IOV_STRIDE 16
+
 static inline int copy_from_iotlb(const struct vringh *vrh, void *dst,
                                  void *src, size_t len)
 {
        u64 total_translated = 0;
 
        while (total_translated < len) {
-               struct bio_vec iov[16];
+               struct bio_vec iov[IOTLB_IOV_STRIDE];
                struct iov_iter iter;
                u64 translated;
                int ret;
@@ -1180,7 +1182,7 @@ static inline int copy_to_iotlb(const struct vringh *vrh, 
void *dst,
        u64 total_translated = 0;
 
        while (total_translated < len) {
-               struct bio_vec iov[16];
+               struct bio_vec iov[IOTLB_IOV_STRIDE];
                struct iov_iter iter;
                u64 translated;
                int ret;
-- 
2.39.2

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