netdev - Re: [PATCH RESEND net] nfc: use GFP_USER for user-controlled kmalloc

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Date:	Wed, 27 Jan 2016 09:55:55 +1100
From:	Julian Calaby <julian.calaby@...il.com>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	netdev <netdev@...r.kernel.org>, dvyukov@...gle.com,
	linux-wireless <linux-wireless@...r.kernel.org>,
	Lauro Ramos Venancio <lauro.venancio@...nbossa.org>,
	Aloisio Almeida Jr <aloisio.almeida@...nbossa.org>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH RESEND net] nfc: use GFP_USER for user-controlled kmalloc

Hi Cong,

On Wed, Jan 27, 2016 at 4:53 AM, Cong Wang <xiyou.wangcong@...il.com> wrote:

A commit message would be nice. A brief rundown of how this is called
from userspace would be nice (I'm talking a single sentence here, e.g.
"this is allocated when submitting a nfc packet") and what issue
__GFP_NOWARN is fixing. (I'm guessing log spam due to allocation
failures.)

> Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: Lauro Ramos Venancio <lauro.venancio@...nbossa.org>
> Cc: Aloisio Almeida Jr <aloisio.almeida@...nbossa.org>
> Cc: Samuel Ortiz <sameo@...ux.intel.com>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
> ---
>  net/nfc/llcp_commands.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/nfc/llcp_commands.c b/net/nfc/llcp_commands.c
> index 3621a90..5d94055 100644
> --- a/net/nfc/llcp_commands.c
> +++ b/net/nfc/llcp_commands.c
> @@ -729,7 +729,7 @@ int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
>         if (local == NULL)
>                 return -ENODEV;
>
> -       msg_data = kzalloc(len, GFP_KERNEL);
> +       msg_data = kzalloc(len, GFP_USER | __GFP_NOWARN);
>         if (msg_data == NULL)
>                 return -ENOMEM;

Thanks,

-- 
Julian Calaby

Email: julian.calaby@...il.com
Profile: http://www.google.com/profiles/julian.calaby/