linux-kernel - Re: [PATCH v1] tty: serial: Use GFP_ATOMIC instead of GFP_KERNEL in serial8250_em485

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Message-ID: <CAJs94EY5cRQhsoJtcQ23b11sDaFvm_MkcuzW_utLg8=6AvExtg@mail.gmail.com>
Date:	Fri, 19 Feb 2016 08:36:02 +0300
From:	"Matwey V. Kornilov" <matwey@....msu.ru>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Andy Shevchenko <andy.shevchenko@...il.com>,
	Jiri Slaby <jslaby@...e.com>,
	Peter Hurley <peter@...leysoftware.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	Ильяс Гасанов 
	<torso.nafi@...il.com>
Subject: Re: [PATCH v1] tty: serial: Use GFP_ATOMIC instead of GFP_KERNEL in serial8250_em485_init()

2016-02-19 2:47 GMT+03:00 Greg Kroah-Hartman <gregkh@...uxfoundation.org>:
> On Thu, Feb 18, 2016 at 11:29:07PM +0300, Matwey V. Kornilov wrote:
>> 2016-02-18 23:21 GMT+03:00 Andy Shevchenko <andy.shevchenko@...il.com>:
>> > On Thu, Feb 18, 2016 at 8:47 PM, Matwey V. Kornilov <matwey@....msu.ru> wrote:
>> >> serial8250_em485_init() is supposed to be protected with
>> >> p->port.lock spinlock.
>> >> This may lead to issues when kmalloc sleeps, so it is better to use
>> >> GFP_ATOMIC in this spinlocked context.
>> >>
>> >> Fixes: e490c9144cfa ("tty: Add software emulated RS485 support for 8250")
>> >> Reported-by: <torso.nafi@...il.com>
>> >
>> > Hmm... Can't we put Cyrillic characters to tags as name of a person?
>>
>> I am afraid non-ASCII will break something eventually. I think it
>> would be better to ask Ilias to put his name in proper latin
>> transcription here.
>
> Why, we accept non-ASCII names all the time, why would we not do so?
>
> Please fix up and resend.

Sure, I've just sent v2.
I am used that non-ASCIIs break things, as they did it 20 years ago,
as they do it in 2016. GhostView stole all my Cyrillic characters from
PDF when I tried to embed fonts two days ago .

>
> thansk,
>
> greg k-h
>



-- 
With best regards,
Matwey V. Kornilov.
Sternberg Astronomical Institute, Lomonosov Moscow State University, Russia
119991, Moscow, Universitetsky pr-k 13, +7 (495) 9392382