Boot failure since 3.3-rc?

[Sune Mølgaard]

Hiya,

My old AMD Duron system (i386 with 2G RAM) has been unable to boot 
recent kernels, and I have bisected it down to:

commit 321bf4ed5ff5f7c62ef59f33b7eec5b154391f0a
Author: Yinghai Lu <yinghai@xxxxxxxxxx>
Date:   Mon Jan 30 13:57:12 2012 -0800

    drivers/base/memory.c: fix memory_dev_init() long delay

    One system with 2048g ram, reported soft lockup on recent kernel.

[snip the trace of the bug that this should fix]

    Finally it takes about 55s to create 16400 memory entries.

    Root cause: for x86_64, 2048g (with 2g hole at [2g,4g), and TOP2 
will be 2050g), will have 16400 memory block.

    find_memory_block/subsys_find_device_by_id will be expensive with 
that many entries.

    Actually, we don't need to find that memory block for BOOT path.

    Skip that finding make it get back to normal.

    [   34.466696] cpu_dev_init done
    [   35.290080] memory_dev_init done

    Also solved the delay with topology_init when sections_per_block is 
not 1.

    Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
    Cc: Kay Sievers <kay.sievers@xxxxxxxx>
    Cc: Nathan Fontenot <nfont@xxxxxxxxxxxxxx>
    Cc: Robin Holt <holt@xxxxxxx>
    Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

:040000 040000 95174f8192a2303d9e59e5f8523a58780b828e3e 
2de57c6dc44872ac11766616f1cf05d6070b60de M	drivers

Will be happy to test patches, but compilation is obviously slow on this 
machine, so some delay might occur.

Best regards,

Sune Mølgaard

--
To err is human--and to blame it on a computer is even more so.
- Orben - Current Comedy

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