[PATCH] IB/core: Print error when umem fails due to locked memory limit.

[j.glisse@gmail.com]

From: Jérôme Glisse <jglisse@redhat.com>

It can be rather tedious to find why userspace is failing when only
thing kernel report is -ENOMEM. This add an error message so that
user can figure out why they are getting -ENOMEM.

Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
cc: <linux-rdma@vger.kernel.org>
Cc: Haggai Eran <haggaie@mellanox.com>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Shachar Raindel <raindel@mellanox.com>
Cc: Doug Ledford <dledford@redhat.com>
---
 drivers/infiniband/core/umem.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index 38acb3c..a66929e 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -169,6 +169,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
 	lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
 
 	if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) {
+		pr_err("locked memory quota exhausted (see ulimit -l)\n");
 		ret = -ENOMEM;
 		goto out;
 	}
-- 
1.8.3.1