linux-kernel - Re: [Bug #14015] pty regressed again, breaking expect and gcc's testsuite

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Message-ID: <87y6ot3t7o.fsf@devron.myhome.or.jp>
Date:	Sun, 06 Sep 2009 07:46:51 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mikael Pettersson <mikpe@...uu.se>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Alan Cox <alan@...ux.intel.com>, Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Bug #14015] pty regressed again, breaking expect and gcc's testsuite

Alan Cox <alan@...rguk.ukuu.org.uk> writes:

>> So, it will use the 64kb limit at least few paths, and I'm not sure
>> though, non-n_tty path (e.g. ppp) doesn't use tty_write_room() check
>> always. It may not be consistent if we removed pty_space() in pty_write().
>
> The correct behaviour for most network protocols to overflow is to drop
> packets so the behaviour of not checking was intentional.

I see. I meant, ppp doesn't check (64kb) on write, but post-process(?)
checks (8kb). If there is this situation, I just worried it becomes the
cause of wrong behavior.

Thanks.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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