linux-kernel - Re: [PATCH 1/3] infiniband: i40iw: Replace GFP_ATOMIC with GFP_KERNEL in i40iw_add_mqh

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Date:   Tue, 17 Apr 2018 19:58:09 -0600
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Jia-Ju Bai <baijiaju1990@...il.com>
Cc:     faisal.latif@...el.com, shiraz.saleem@...el.com,
        dledford@...hat.com, sean.hefty@...el.com,
        hal.rosenstock@...il.com, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] infiniband: i40iw: Replace GFP_ATOMIC with
 GFP_KERNEL in i40iw_add_mqh_4

On Wed, Apr 11, 2018 at 03:32:25PM +0800, Jia-Ju Bai wrote:
> i40iw_add_mqh_4() is never called in atomic context, because it 
> calls rtnl_lock() that can sleep.
> 
> Despite never getting called from atomic context,
> i40iw_add_mqh_4() calls kzalloc() 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 <baijiaju1990@...il.com>
> Acked-by: Shiraz Saleem <shiraz.saleem@...el.com>
> ---
>  drivers/infiniband/hw/i40iw/i40iw_cm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied all three patches in this series to for-next, thanks

Jason