Re: [PATCH 2/2] ntb: ntb_transport: Replace GFP_ATOMIC with GFP_KERNEL in ntb_transport_create_queue
On Tue, Apr 10, 2018 at 09:17:54PM +0800, Jia-Ju Bai wrote: > ntb_transport_create_queue() is never called in atomic context. > > ntb_transport_create_queue() is only called by ntb_netdev_probe(), > which is set as ".probe" in struct ntb_transport_client. > > Despite never getting called from atomic context, > ntb_transport_create_queue() calls kzalloc_node() with GFP_ATOMIC, > which does not sleep for allocation. > GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL, > which can sleep and improve the possibility of sucessful allocation. > > This is found by a static analysis tool named DCNS written by myself. > And I also manually check it > > Signed-off-by: Jia-Ju BaiBoth patches have been applied to my ntb-next branch. Thanks, Jon > --- > drivers/ntb/ntb_transport.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c > index f58d8e3..2c0c8bc 100644 > --- a/drivers/ntb/ntb_transport.c > +++ b/drivers/ntb/ntb_transport.c > @@ -1825,7 +1825,7 @@ struct ntb_transport_qp * > qp->rx_dma_chan ? "DMA" : "CPU"); > > for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { > - entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); > + entry = kzalloc_node(sizeof(*entry), GFP_KERNEL, node); > if (!entry) > goto err1; > > @@ -1836,7 +1836,7 @@ struct ntb_transport_qp * > qp->rx_alloc_entry = NTB_QP_DEF_NUM_ENTRIES; > > for (i = 0; i < qp->tx_max_entry; i++) { > - entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); > + entry = kzalloc_node(sizeof(*entry), GFP_KERNEL, node); > if (!entry) > goto err2; > > -- > 1.9.1 >
Re: [PATCH 2/2] ntb: ntb_transport: Replace GFP_ATOMIC with GFP_KERNEL in ntb_transport_create_queue
On Tue, Apr 10, 2018 at 09:17:54PM +0800, Jia-Ju Bai wrote: > ntb_transport_create_queue() is never called in atomic context. > > ntb_transport_create_queue() is only called by ntb_netdev_probe(), > which is set as ".probe" in struct ntb_transport_client. > > Despite never getting called from atomic context, > ntb_transport_create_queue() calls kzalloc_node() with GFP_ATOMIC, > which does not sleep for allocation. > GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL, > which can sleep and improve the possibility of sucessful allocation. > > This is found by a static analysis tool named DCNS written by myself. > And I also manually check it > > Signed-off-by: Jia-Ju Bai Both patches have been applied to my ntb-next branch. Thanks, Jon > --- > drivers/ntb/ntb_transport.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c > index f58d8e3..2c0c8bc 100644 > --- a/drivers/ntb/ntb_transport.c > +++ b/drivers/ntb/ntb_transport.c > @@ -1825,7 +1825,7 @@ struct ntb_transport_qp * > qp->rx_dma_chan ? "DMA" : "CPU"); > > for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { > - entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); > + entry = kzalloc_node(sizeof(*entry), GFP_KERNEL, node); > if (!entry) > goto err1; > > @@ -1836,7 +1836,7 @@ struct ntb_transport_qp * > qp->rx_alloc_entry = NTB_QP_DEF_NUM_ENTRIES; > > for (i = 0; i < qp->tx_max_entry; i++) { > - entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); > + entry = kzalloc_node(sizeof(*entry), GFP_KERNEL, node); > if (!entry) > goto err2; > > -- > 1.9.1 >
[PATCH 2/2] ntb: ntb_transport: Replace GFP_ATOMIC with GFP_KERNEL in ntb_transport_create_queue
ntb_transport_create_queue() is never called in atomic context. ntb_transport_create_queue() is only called by ntb_netdev_probe(), which is set as ".probe" in struct ntb_transport_client. Despite never getting called from atomic context, ntb_transport_create_queue() calls kzalloc_node() with GFP_ATOMIC, which does not sleep for allocation. GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL, which can sleep and improve the possibility of sucessful allocation. This is found by a static analysis tool named DCNS written by myself. And I also manually check it Signed-off-by: Jia-Ju Bai--- drivers/ntb/ntb_transport.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c index f58d8e3..2c0c8bc 100644 --- a/drivers/ntb/ntb_transport.c +++ b/drivers/ntb/ntb_transport.c @@ -1825,7 +1825,7 @@ struct ntb_transport_qp * qp->rx_dma_chan ? "DMA" : "CPU"); for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { - entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); + entry = kzalloc_node(sizeof(*entry), GFP_KERNEL, node); if (!entry) goto err1; @@ -1836,7 +1836,7 @@ struct ntb_transport_qp * qp->rx_alloc_entry = NTB_QP_DEF_NUM_ENTRIES; for (i = 0; i < qp->tx_max_entry; i++) { - entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); + entry = kzalloc_node(sizeof(*entry), GFP_KERNEL, node); if (!entry) goto err2; -- 1.9.1
[PATCH 2/2] ntb: ntb_transport: Replace GFP_ATOMIC with GFP_KERNEL in ntb_transport_create_queue
ntb_transport_create_queue() is never called in atomic context. ntb_transport_create_queue() is only called by ntb_netdev_probe(), which is set as ".probe" in struct ntb_transport_client. Despite never getting called from atomic context, ntb_transport_create_queue() calls kzalloc_node() with GFP_ATOMIC, which does not sleep for allocation. GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL, which can sleep and improve the possibility of sucessful allocation. This is found by a static analysis tool named DCNS written by myself. And I also manually check it Signed-off-by: Jia-Ju Bai --- drivers/ntb/ntb_transport.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c index f58d8e3..2c0c8bc 100644 --- a/drivers/ntb/ntb_transport.c +++ b/drivers/ntb/ntb_transport.c @@ -1825,7 +1825,7 @@ struct ntb_transport_qp * qp->rx_dma_chan ? "DMA" : "CPU"); for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { - entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); + entry = kzalloc_node(sizeof(*entry), GFP_KERNEL, node); if (!entry) goto err1; @@ -1836,7 +1836,7 @@ struct ntb_transport_qp * qp->rx_alloc_entry = NTB_QP_DEF_NUM_ENTRIES; for (i = 0; i < qp->tx_max_entry; i++) { - entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); + entry = kzalloc_node(sizeof(*entry), GFP_KERNEL, node); if (!entry) goto err2; -- 1.9.1