io_uring: remove sq/cq_off memset

We only have two reserved members we're not clearing, do so manually
instead. This is in preparation for using one of these members for
a new feature.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 7c42658..13a7fce 100644 (file)
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -3866,7 +3866,6 @@ static __cold int io_uring_create(unsigned entries, struct io_uring_params *p,
        if (ret)
                goto err;
 
-       memset(&p->sq_off, 0, sizeof(p->sq_off));
        p->sq_off.head = offsetof(struct io_rings, sq.head);
        p->sq_off.tail = offsetof(struct io_rings, sq.tail);
        p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask);
@@ -3874,8 +3873,9 @@ static __cold int io_uring_create(unsigned entries, struct io_uring_params *p,
        p->sq_off.flags = offsetof(struct io_rings, sq_flags);
        p->sq_off.dropped = offsetof(struct io_rings, sq_dropped);
        p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings;
+       p->sq_off.resv1 = 0;
+       p->sq_off.resv2 = 0;
 
-       memset(&p->cq_off, 0, sizeof(p->cq_off));
        p->cq_off.head = offsetof(struct io_rings, cq.head);
        p->cq_off.tail = offsetof(struct io_rings, cq.tail);
        p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask);
@@ -3883,6 +3883,8 @@ static __cold int io_uring_create(unsigned entries, struct io_uring_params *p,
        p->cq_off.overflow = offsetof(struct io_rings, cq_overflow);
        p->cq_off.cqes = offsetof(struct io_rings, cqes);
        p->cq_off.flags = offsetof(struct io_rings, cq_flags);
+       p->cq_off.resv1 = 0;
+       p->cq_off.resv2 = 0;
 
        p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP |
                        IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS |