linux-kernel - [PATCH] net: ll_temac: Use GFP_KERNEL instead of GFP

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Message-Id: <694abd65418b2b3974106a82d758e3474c65ae8f.1645042560.git.christophe.jaillet@wanadoo.fr>
Date:   Wed, 16 Feb 2022 21:16:16 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Michal Simek <michal.simek@...inx.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] net: ll_temac: Use GFP_KERNEL instead of GFP_ATOMIC when possible

XTE_MAX_JUMBO_FRAME_SIZE is over 9000 bytes and the default value for
'rx_bd_num' is RX_BD_NUM_DEFAULT	(i.e. 1024)

So this loop allocates more than 9 Mo of memory.

Previous memory allocations in this function already use GFP_KERNEL, so
use __netdev_alloc_skb_ip_align() and an explicit GFP_KERNEL instead of a
implicit GFP_ATOMIC.

This gives more opportunities of successful allocation.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/net/ethernet/xilinx/ll_temac_main.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c
index b900ab5aef2a..0547a3fde561 100644
--- a/drivers/net/ethernet/xilinx/ll_temac_main.c
+++ b/drivers/net/ethernet/xilinx/ll_temac_main.c
@@ -361,8 +361,9 @@ static int temac_dma_bd_init(struct net_device *ndev)
 		lp->rx_bd_v[i].next = cpu_to_be32(lp->rx_bd_p
 			+ sizeof(*lp->rx_bd_v) * ((i + 1) % lp->rx_bd_num));
 
-		skb = netdev_alloc_skb_ip_align(ndev,
-						XTE_MAX_JUMBO_FRAME_SIZE);
+		skb = __netdev_alloc_skb_ip_align(ndev,
+						  XTE_MAX_JUMBO_FRAME_SIZE,
+						  GFP_KERNEL);
 		if (!skb)
 			goto out;
 
-- 
2.32.0