When memory registration is needed for page count which exceeds the
allowed lock limit the function exits with an error but no error is
printed.
Since this is a case that system administrator can fix (rlimit etc) we
need to give an alert.
This is not a data patch so performance penalty is not a consideration.
Signed-off-by: Yuval Shaia <yuval.shaia@xxxxxxxxxx>
---
v0 -> v1:
* Accept Leon's comment pr_err to pr_err_ratelimited
---
drivers/infiniband/core/umem.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index c6144df47ea4..73f85cc35418 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -164,6 +164,8 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
if (check_add_overflow(mm->pinned_vm, npages, &new_pinned) ||
(new_pinned > lock_limit && !capable(CAP_IPC_LOCK))) {
up_write(&mm->mmap_sem);
+ pr_err_ratelimited("%s: Can't pin memory, requested %d, limit %d, ipc_lock off\n",
+ _func__, new_pinned, lock_limit);
ret = -ENOMEM;
goto out;
}
--
2.19.2
