linux-kernel - Re: [PATCH 1/2] RDMA/rxe: add missing newline to rxe_set

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Date:   Wed, 23 Aug 2023 14:59:10 +0800
From:   Zhu Yanjun <yanjun.zhu@...ux.dev>
To:     "Zhijian Li (Fujitsu)" <lizhijian@...itsu.com>,
        Zhu Yanjun <zyjzyj2000@...il.com>,
        "pmladek@...e.com" <pmladek@...e.com>,
        "senozhatsky@...omium.org" <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        "john.ogness@...utronix.de" <john.ogness@...utronix.de>
Cc:     "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "jgg@...pe.ca" <jgg@...pe.ca>, "leon@...nel.org" <leon@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rpearsonhpe@...il.com" <rpearsonhpe@...il.com>
Subject: Re: [PATCH 1/2] RDMA/rxe: add missing newline to rxe_set_mtu message


在 2023/8/23 14:47, Zhijian Li (Fujitsu) 写道:
>
> On 23/08/2023 14:35, Zhu Yanjun wrote:
>> On Wed, Aug 23, 2023 at 2:25 PM Zhijian Li (Fujitsu)
>> <lizhijian@...itsu.com> wrote:
>>>
>>>
>>> On 23/08/2023 14:12, Zhu Yanjun wrote:
>>>> 在 2023/8/23 10:13, Li Zhijian 写道:
>>>>> A newline help flushing message out.
>>>> rxe_info_dev will finally call printk to output information.
>>>>
>>>> In this link https://github.com/torvalds/linux/blob/master/Documentation/core-api/printk-basics.rst,
>>>> "
>>>> All printk() messages are printed to the kernel log buffer, which is a ring buffer exported to userspace through /dev/kmsg. The usual way to read it is using dmesg.
>>>> "
>>>> Do you mean that a new line will help the kernel log buffer flush message out?
>>> Yeah, the message will be buffered until it is full or it meets a newline.
>> Add PRINTK reviewers:
>>
>> Petr Mladek <pmladek@...e.com>
>> Sergey Senozhatsky <senozhatsky@...omium.org>
>> Steven Rostedt <rostedt@...dmis.org>
>>    John Ogness <john.ogness@...utronix.de>
>>
>> This is about printk. They can decide this commit.
> I don't think it's a printk stuff.
Do you get me?

I mean, prinkt reviewer will check the statement "the message will be 
buffered until it is full or it meets a newline." correct or not.

Zhu Yanjun

>
> In general, when developers add some printk()/pr_info() to print some message in the kernel, they expect this message will be printed in time.
> So most of the printk()/pr_info() calls in current kernel accompany a '\n' at the end.
>
> And printk() will also print message to 'console' by default, console could be a serial port(ttyS0) or tty1 etc.
>
> Thanks
> Zhijian
>
>
>> Zhu Yanjun
>>
>>>
>>>
>>>> Zhu Yanjun
>>>>> Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
>>>>> ---
>>>>>     drivers/infiniband/sw/rxe/rxe.c | 2 +-
>>>>>     1 file changed, 1 insertion(+), 1 deletion(-)
>>>>>
>>>>> diff --git a/drivers/infiniband/sw/rxe/rxe.c b/drivers/infiniband/sw/rxe/rxe.c
>>>>> index 54c723a6edda..cb2c0d54aae1 100644
>>>>> --- a/drivers/infiniband/sw/rxe/rxe.c
>>>>> +++ b/drivers/infiniband/sw/rxe/rxe.c
>>>>> @@ -161,7 +161,7 @@ void rxe_set_mtu(struct rxe_dev *rxe, unsigned int ndev_mtu)
>>>>>         port->attr.active_mtu = mtu;
>>>>>         port->mtu_cap = ib_mtu_enum_to_int(mtu);
>>>>> -    rxe_info_dev(rxe, "Set mtu to %d", port->mtu_cap);
>>>>> +    rxe_info_dev(rxe, "Set mtu to %d\n", port->mtu_cap);
>>>>>     }
>>>>>     /* called by ifc layer to create new rxe device.
>>> >