[dpdk-stable] [PATCH v2] mem: ease init in a docker container

[Nicolas Dichtel <nicolas.dichtel@6wind.com>]

move_pages() is only used to get the numa node id, but this function
is not allowed by default in docker (it needs CAP_SYS_NICE and an update of
the seccomp profile).
get_mempolicy() also requires CAP_SYS_NICE but doesn't need any change in
the default seccomp profile.

Note that the returned value of move_pages() was not checked, thus some
errors could be hidden (if the requested id was 0).

Cc: stable@dpdk.org
Fixes: 582bed1e1d1d ("mem: support mapping hugepages at runtime")
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Reviewed-by: Olivier Matz <olivier.matz@6wind.com>
Reviewed-by: Didier Pallard <didier.pallard@6wind.com>
Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>
---

v2: add fixes tag + cc stable
    fix title prefix

 lib/librte_eal/linux/eal/eal_memalloc.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/lib/librte_eal/linux/eal/eal_memalloc.c b/lib/librte_eal/linux/eal/eal_memalloc.c
index 1e9ebb86dd1b..438faa0ab168 100644
--- a/lib/librte_eal/linux/eal/eal_memalloc.c
+++ b/lib/librte_eal/linux/eal/eal_memalloc.c
@@ -600,9 +600,13 @@ alloc_seg(struct rte_memseg *ms, void *addr, int socket_id,
 	}
 
 #ifdef RTE_EAL_NUMA_AWARE_HUGEPAGES
-	move_pages(getpid(), 1, &addr, NULL, &cur_socket_id, 0);
-
-	if (cur_socket_id != socket_id) {
+	ret = get_mempolicy(&cur_socket_id, NULL, 0, addr,
+			    MPOL_F_NODE | MPOL_F_ADDR);
+	if (ret < 0) {
+		RTE_LOG(DEBUG, EAL, "%s(): get_mempolicy: %s\n",
+			__func__, strerror(errno));
+		goto mapped;
+	} else if (cur_socket_id != socket_id) {
 		RTE_LOG(DEBUG, EAL,
 				"%s(): allocation happened on wrong socket (wanted %d, got %d)\n",
 			__func__, socket_id, cur_socket_id);
-- 
2.21.0