ring: use aligned memzone allocation

rte_memzone_reserve() provides cache line alignment, but
struct rte_ring may require more than cache line alignment: on x86-64,
it needs 128-byte alignment due to PROD_ALIGN and CONS_ALIGN, which are
128 bytes, but cache line size is 64 bytes.

Fixes runtime warnings with UBSan enabled.

Fixes: d9f0d3a1ffd4 ("ring: remove split cacheline build setting")
Cc: stable@dpdk.org
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>

diff --git a/lib/librte_ring/rte_ring.c b/lib/librte_ring/rte_ring.c
index 5f98c33..6f58faf 100644 (file)
--- a/lib/librte_ring/rte_ring.c
+++ b/lib/librte_ring/rte_ring.c
@@ -189,7 +189,8 @@ rte_ring_create(const char *name, unsigned count, int socket_id,
        /* reserve a memory zone for this ring. If we can't get rte_config or
         * we are secondary process, the memzone_reserve function will set
         * rte_errno for us appropriately - hence no check in this this function */
-       mz = rte_memzone_reserve(mz_name, ring_size, socket_id, mz_flags);
+       mz = rte_memzone_reserve_aligned(mz_name, ring_size, socket_id,
+                                        mz_flags, __alignof__(*r));
        if (mz != NULL) {
                r = mz->addr;
                /* no need to check return value here, we already checked the