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Date: Mon, 12 Dec 2016 15:04:28 +0200
From: Ozgur Karatas <okaratas@...ber.fsf.org>
To: Leon Romanovsky <leon@...nel.org>
Cc: "yishaih@...lanox.com" <yishaih@...lanox.com>,
netdev <netdev@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] Fixed to BUG_ON to WARN_ON def
Dear Romanovsky;
I'm trying to learn english and I apologize for my mistake words and phrases. So, I think the code when call to "sg_set_buf" and next time set memory and buffer. For example, isn't to call "WARN_ON" function, get a error to implicit declaration, right?
Because, you will use to "BUG_ON" get a error implicit declaration of functions.
sg_set_buf(mem, buf, PAGE_SIZE << order);
WARN_ON(mem->offset);
Thanks for information and learn to me.
Regards,
Ozgur Karatas
12.12.2016, 14:39, "Leon Romanovsky" <leon@...nel.org>:
> On Mon, Dec 12, 2016 at 12:58:59PM +0200, Ozgur Karatas wrote:
>> Hello all,
>> I think should be use to "WARN_ON" and checkpatch script give to error, I fixed and I think should don't use "BUG_ON".
>> Regards,
>>
>> Signed-off-by: Ozgur Karatas <okaratas@...ber.fsf.org>
>
> NAK, Leon Romanovsky <leonro@...lanox.com>
>
> If we put aside commit message issue, which was pointed to you by Stefan, your
> proposed change is incorrect. By chnaging BUG_ONs to be WARN_ONs, you
> will left the driver in improper state.
>
> Thanks
>
>> ---
>> drivers/net/ethernet/mellanox/mlx4/icm.c | 4 ++--
>>
>> diff --git a/drivers/net/ethernet/mellanox/mlx4/icm.c b/drivers/net/ethernet/mellanox/mlx4/icm.c
>> index 2a9dd46..3fde535 100644
>> --- a/drivers/net/ethernet/mellanox/mlx4/icm.c
>> +++ b/drivers/net/ethernet/mellanox/mlx4/icm.c
>> @@ -119,7 +119,7 @@ static int mlx4_alloc_icm_coherent(struct device *dev, struct scatterlist *mem,
>> return -ENOMEM;
>>
>> sg_set_buf(mem, buf, PAGE_SIZE << order);
>> - BUG_ON(mem->offset);
>> + WARN_ON(mem->offset);
>> sg_dma_len(mem) = PAGE_SIZE << order;
>> return 0;
>> }
>> @@ -133,7 +133,7 @@ struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,
>> int ret;
>>
>> /* We use sg_set_buf for coherent allocs, which assumes low memory */
>> - BUG_ON(coherent && (gfp_mask & __GFP_HIGHMEM));
>> + WARN_ON(coherent && (gfp_mask & __GFP_HIGHMEM));
>>
>> icm = kmalloc_node(sizeof(*icm),
>> gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN),
>> --
>> 2.1.4
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