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

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Date:	Thu, 15 Oct 2015 10:21:56 -0400
From:	j.glisse@...il.com
To:	linux-kernel@...r.kernel.org
Cc:	Jérôme Glisse <jglisse@...hat.com>,
	<linux-rdma@...r.kernel.org>, Haggai Eran <haggaie@...lanox.com>,
	Sagi Grimberg <sagig@...lanox.com>,
	Shachar Raindel <raindel@...lanox.com>,
	Doug Ledford <dledford@...hat.com>
Subject: [PATCH] IB/core: Print error when umem fails due to locked memory limit.

From: Jérôme Glisse <jglisse@...hat.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@...hat.com>
cc: <linux-rdma@...r.kernel.org>
Cc: Haggai Eran <haggaie@...lanox.com>
Cc: Sagi Grimberg <sagig@...lanox.com>
Cc: Shachar Raindel <raindel@...lanox.com>
Cc: Doug Ledford <dledford@...hat.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

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