[PATCH 4.9 005/102] IB/hfi1: Silence txreq allocation warnings

Greg Kroah-Hartman
2019-07-08T15:47:02Z

From: Mike Marciniszyn <mike.marciniszyn@intel.com>

commit 3230f4a8d44e4a0bb7afea814b280b5129521f52 upstream.

The following warning can happen when a memory shortage
occurs during txreq allocation:

[10220.939246] SLUB: Unable to allocate memory on node -1, gfp=0xa20(GFP_ATOMIC)
[10220.939246] Hardware name: Intel Corporation S2600WT2R/S2600WT2R, BIOS SE5C610.86B.01.01.0018.C4.072020161249 07/20/2016
[10220.939247] cache: mnt_cache, object size: 384, buffer size: 384, default order: 2, min order: 0
[10220.939260] Workqueue: hfi0_0 _hfi1_do_send [hfi1]
[10220.939261] node 0: slabs: 1026568, objs: 43115856, free: 0
[10220.939262] Call Trace:
[10220.939262] node 1: slabs: 820872, objs: 34476624, free: 0
[10220.939263] dump_stack+0x5a/0x73
[10220.939265] warn_alloc+0x103/0x190
[10220.939267] ? wake_all_kswapds+0x54/0x8b
[10220.939268] __alloc_pages_slowpath+0x86c/0xa2e
[10220.939270] ? __alloc_pages_nodemask+0x2fe/0x320
[10220.939271] __alloc_pages_nodemask+0x2fe/0x320
[10220.939273] new_slab+0x475/0x550
[10220.939275] ___slab_alloc+0x36c/0x520
[10220.939287] ? hfi1_make_rc_req+0x90/0x18b0 [hfi1]
[10220.939299] ? __get_txreq+0x54/0x160 [hfi1]
[10220.939310] ? hfi1_make_rc_req+0x90/0x18b0 [hfi1]
[10220.939312] __slab_alloc+0x40/0x61
[10220.939323] ? hfi1_make_rc_req+0x90/0x18b0 [hfi1]
[10220.939325] kmem_cache_alloc+0x181/0x1b0
[10220.939336] hfi1_make_rc_req+0x90/0x18b0 [hfi1]
[10220.939348] ? hfi1_verbs_send_dma+0x386/0xa10 [hfi1]
[10220.939359] ? find_prev_entry+0xb0/0xb0 [hfi1]
[10220.939371] hfi1_do_send+0x1d9/0x3f0 [hfi1]
[10220.939372] process_one_work+0x171/0x380
[10220.939374] worker_thread+0x49/0x3f0
[10220.939375] kthread+0xf8/0x130
[10220.939377] ? max_active_store+0x80/0x80
[10220.939378] ? kthread_bind+0x10/0x10
[10220.939379] ret_from_fork+0x35/0x40
[10220.939381] SLUB: Unable to allocate memory on node -1, gfp=0xa20(GFP_ATOMIC)

The shortage is handled properly so the message isn't needed. Silence by
adding the no warn option to the slab allocation.

Fixes: 45842abbb292 ("staging/rdma/hfi1: move txreq header code")
Cc: <stable@vger.kernel.org>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/infiniband/hw/hfi1/verbs_txreq.c | 2 +-
drivers/infiniband/hw/hfi1/verbs_txreq.h | 3 ++-
2 files changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/infiniband/hw/hfi1/verbs_txreq.c
+++ b/drivers/infiniband/hw/hfi1/verbs_txreq.c
@@ -100,7 +100,7 @@ struct verbs_txreq *__get_txreq(struct h
if (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) {
struct hfi1_qp_priv *priv;

- tx = kmem_cache_alloc(dev->verbs_txreq_cache, GFP_ATOMIC);
+ tx = kmem_cache_alloc(dev->verbs_txreq_cache, VERBS_TXREQ_GFP);
if (tx)
goto out;
priv = qp->priv;
--- a/drivers/infiniband/hw/hfi1/verbs_txreq.h
+++ b/drivers/infiniband/hw/hfi1/verbs_txreq.h
@@ -71,6 +71,7 @@ struct hfi1_ibdev;
struct verbs_txreq *__get_txreq(struct hfi1_ibdev *dev,
struct rvt_qp *qp);

+#define VERBS_TXREQ_GFP (GFP_ATOMIC | __GFP_NOWARN)
static inline struct verbs_txreq *get_txreq(struct hfi1_ibdev *dev,
struct rvt_qp *qp)
__must_hold(&qp->slock)
@@ -78,7 +79,7 @@ static inline struct verbs_txreq *get_tx
struct verbs_txreq *tx;
struct hfi1_qp_priv *priv = qp->priv;

- tx = kmem_cache_alloc(dev->verbs_txreq_cache, GFP_ATOMIC);
+ tx = kmem_cache_alloc(dev->verbs_txreq_cache, VERBS_TXREQ_GFP);
if (unlikely(!tx)) {
/* call slow path to get the lock */
tx = __get_txreq(dev, qp);