netdev - [PATCH net-next 1/4] sfc: use __GFP_NOWARN when allocating RX pages from atomic context.

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Date:	Wed, 28 Oct 2015 15:01:29 +0000
From:	Shradha Shah <sshah@...arflare.com>
To:	David Miller <davem@...emloft.net>
CC:	<netdev@...r.kernel.org>, <linux-net-drivers@...arflare.com>
Subject: [PATCH net-next 1/4] sfc: use __GFP_NOWARN when allocating RX pages
 from atomic context.

From: Alexandra Kossovsky <Alexandra.Kossovsky@...etlabs.ru>

If we fail to allocate a page when in atomic context this is
handled by scheduling a fill in non-atomic context.
As such, a warning is not needed.

Signed-off-by: Shradha Shah <sshah@...arflare.com>
---
 drivers/net/ethernet/sfc/rx.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c
index 809ea461..3f0e129 100644
--- a/drivers/net/ethernet/sfc/rx.c
+++ b/drivers/net/ethernet/sfc/rx.c
@@ -163,8 +163,15 @@ static int efx_init_rx_buffers(struct efx_rx_queue *rx_queue, bool atomic)
 	do {
 		page = efx_reuse_page(rx_queue);
 		if (page == NULL) {
+			/* GFP_ATOMIC may fail because of various reasons,
+			 * and we re-schedule rx_fill from non-atomic
+			 * context in such a case.  So, use __GFP_NO_WARN
+			 * in case of atomic.
+			 */
 			page = alloc_pages(__GFP_COLD | __GFP_COMP |
-					   (atomic ? GFP_ATOMIC : GFP_KERNEL),
+					   (atomic ?
+					    (GFP_ATOMIC | __GFP_NOWARN)
+					    : GFP_KERNEL),
 					   efx->rx_buffer_order);
 			if (unlikely(page == NULL))
 				return -ENOMEM;

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