linux-kernel - Re: [take12 0/3] kevent: Generic event handling mechanism.

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Message-ID: <20060822231129.GA18296@ms2.inr.ac.ru>
Date:	Wed, 23 Aug 2006 03:11:29 +0400
From:	Alexey Kuznetsov <kuznet@....inr.ac.ru>
To:	Jari Sundell <sundell.software@...il.com>
Cc:	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Nicholas Miell <nmiell@...cast.net>,
	lkml <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Ulrich Drepper <drepper@...hat.com>,
	Andrew Morton <akpm@...l.org>, netdev <netdev@...r.kernel.org>,
	Zach Brown <zach.brown@...cle.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [take12 0/3] kevent: Generic event handling mechanism.

Hello!

> >No way - timespec uses long.
> 
> I must have missed that discussion. Please enlighten me in what regard
> using an opaque type with lower resolution is preferable to a type
> defined in POSIX for this sort of purpose.

Let me explain, as a person who did this mistake and deeply
regrets about this.

F.e. in this case you just cannot use kevents in 32bit application
on x86_64, unless you add the whole translation layer inside kevent core.
Even when you deal with plain syscall, translation is a big pain,
but when you use mmapped buffer, it can be simply impossible.

F.e. my mistake was "unsigned long" in struct tpacket_hdr in linux/if_packet.h.
It makes use of mmapped packet socket essentially impossible by 32bit
applications on 64bit archs.

Alexey
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