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    SubjectRe: 2.6.21-mm1
    On Sun, May 06, 2007 at 08:33:48AM +0400, Dan Kruchinin wrote:
    > >
    > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.21/2.6.21-mm1/
    >
    > I have the following message after kernel compilation:
    >
    > ---
    > ...
    > WARNING: init/built-in.o - Section mismatch: reference to .init.text:
    > from .text between 'rest_init' (at offset 0x11e) and 'try_name'

    Covered in another mail.

    > ...
    > ...
    > WARNING: drivers/dma/async_tx.o - Section mismatch: reference to
    > .init.data: from .data after 'channel_table' (at offset 0x20)
    > WARNING: drivers/dma/async_tx.o - Section mismatch: reference to
    > .init.data: from .data after 'channel_table' (at offset 0x24)
    > WARNING: drivers/dma/async_tx.o - Section mismatch: reference to
    > .init.data: from .data after 'channel_table' (at offset 0x28)
    > WARNING: drivers/dma/async_tx.o - Section mismatch: reference to
    > .init.data: from .data after 'channel_table' (at offset 0x2c)
    > WARNING: drivers/dma/async_tx.o - Section mismatch: reference to
    > .init.data: from .data after 'channel_table' (at offset 0x30)
    > WARNING: drivers/dma/async_tx.o - Section mismatch: reference to
    > .init.data: from .data after 'channel_table' (at offset 0x34)
    > WARNING: drivers/dma/async_tx.o - Section mismatch: reference to
    > .init.data: from .data after 'channel_table' (at offset 0x38)
    > WARNING: drivers/dma/async_tx.o - Section mismatch: reference to
    > .init.data: from .data after 'channel_table' (at offset 0x3c)
    > WARNING: drivers/dma/async_tx.o - Section mismatch: reference to
    > .init.data: from .data after 'channel_table' (at offset 0x40)
    > WARNING: drivers/dma/async_tx.o - Section mismatch: reference to
    > .init.data: from .data after 'channel_table' (at offset 0x44)

    We have following code:
    /* guarantee that calls that happen before init will not find a channel */
    static struct chan_ref_percpu __initdata null_chan_ref[NR_CPUS];

    static struct chan_ref_percpu *channel_table[] = {
    DMA_TX_ARRAY_INIT(null_chan_ref)
    };

    The DMA_TX_ARRAY_INIT is some macro obscufation that serves no
    real use and just hide a few assignements.
    What happens here is that we assign channel_table a value
    that are used as cover-up until the real assignment happens
    in the init function.
    So the only real way to fix this seems to remove the otherwise correct
    __initdata mark on null_chan_ref.
    Thats one pointer wasted pr. cpu (in total NR_CPUS).

    Sam
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