linux-kernel - Re: [PATCH] ravb: Use GFP_KERNEL instead of GFP

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Message-ID: <8e260e34-58aa-53ba-2ad2-164e6462998b@omp.ru>
Date:   Sun, 20 Feb 2022 13:03:50 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <kernel-janitors@...r.kernel.org>,
        <netdev@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH] ravb: Use GFP_KERNEL instead of GFP_ATOMIC when possible

Hello!

On 2/20/22 10:27 AM, Christophe JAILLET wrote:

> 'max_rx_len' can be up to GBETH_RX_BUFF_MAX (i.e. 8192) (see
> 'gbeth_hw_info').
> The default value of 'num_rx_ring' can be BE_RX_RING_SIZE (i.e. 1024).
> 
> So this loop can allocate 8 Mo of memory.

   MB? :-)

> 
> Previous memory allocations in this function already use GFP_KERNEL, so
> use __netdev_alloc_skb() 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>

Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>

[...]

MBR, Sergey