linux-kernel - Re: i2c or eeprom enumeration problem

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Message-Id: <20080428050515.fcc05689.akpm@linux-foundation.org>
Date:	Mon, 28 Apr 2008 05:05:15 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ulrich Drepper <drepper@...hat.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>, i2c@...sensors.org
Subject: Re: i2c or eeprom enumeration problem

On Sun, 27 Apr 2008 21:20:42 -0700 Ulrich Drepper <drepper@...hat.com> wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> On a NUMA system the eeprom interface in /sys
> 
>   /sys/bus/i2c/drivers/eeprom/*
> 
> do not list all the DRAM eeproms.  Only the DRAM from one node is
> listed.  I have a 4 socket system with all 16 banks filled and see only
> 4 entries.
> 
> My suspicion (without looking at any code) is that the list of i2c
> devices with eeproms is collected once and this happens only on one CPU.
>  I sees not to be dynamic since when I read the files with taskset
> restricting execution on certain sockets and cores the result doesn't
> change.
> 
> Is this known or expected (I hope not the latter)?  Where should I look
> at?  I assume that's in the i2c code?
> 

Let's cc the i2c list.
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