linux-kernel - Re: [PATCH] UML - Console should handle spurious IRQS

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Date:	Sun, 29 Jul 2007 03:50:59 +0300
From:	Eduard-Gabriel Munteanu <maxdamage@...din.ro>
To:	Jeff Dike <jdike@...toit.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] UML - Console should handle spurious IRQS

*This message was transferred with a trial version of CommuniGate(r) Pro*
Jeff Dike wrote:
> The previous DEBUG_SHIRQ patch missed one case.  The console doesn't
> set its host descriptors non-blocking.

Sorry, things looked okay when I tested on my UML environment (Puppy 
Linux). Some xterms popped around (because I was using "con=xterm") and 
the system was usable, so it gave me no indication something was wrong.

I thought of adding an extra debugging option to warn us when a blocking 
  I/O operation is issued for a socket/fd, but UML-specific code is not 
consistent regarding glibc functions. That is, most of the time it calls 
os_*(), but sometimes it calls functions like recvfrom() directly. I'll 
grep the source code for such calls and send a patch to clean it up a bit.

There might still be such cases, I haven't tested all channel types yet.
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