linux-kernel - Re: [PATCH] Fix NUMA emulation for x86

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Message-Id: <20080130.115943.85421886.usui@mxm.nes.nec.co.jp>
Date:	Wed, 30 Jan 2008 11:59:43 +0900 (JST)
From:	Minoru Usui <usui@....nes.nec.co.jp>
To:	mingo@...e.hu
Cc:	linux-kernel@...r.kernel.org, magnus.damm@...il.com
Subject: Re: [PATCH] Fix NUMA emulation for x86_64

>>>>> ">" == Ingo Molnar <mingo@...e.hu> writes:

    >> * Minoru Usui <usui@....nes.nec.co.jp> wrote:

    >> I found a small bug of NUMA emulation code for x86_64. 
    >> (CONFIG_NUMA_EMU) If machine is non-NUMA, find_node_by_addr() should 
    >> return NUMA_NO_NODE, but current implementation code returns existent 
    >> maximum NUMA node number + 1. This is not existent NUMA node number.
    >> 
    >> However, this behaviour does not affect NUMA emulation fortunately, 
    >> because acpi_fake_nodes() that is caller of find_node_by_addr() gets 
    >> pxm (proximity domain) by node_to_pxm() from non-existent NUMA node 
    >> number that was returned by find_node_by_addr(). node_to_pxm() returns 
    >> PXM_INVAL that means illegal or non-existent NUMA node number.

    >> thanks, i have applied your fix to x86.git.

    >> It seems this does not need to be backported to v2.6.24.1 because 
    >> node_to_pxm() masked the bad effects of this bug, right?

    >> 	Ingo

I think this bug is not urgency.
If you mean that it's not necessary to release 2.6.24.1 only for this
bug, I think so.
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