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    SubjectRe: [PATCH 7/12] i386 sg: add support for chaining scatterlists
    On 5/10/07, Jens Axboe <jens.axboe@oracle.com> wrote:
    > [...]
    > +static inline void sg_chain(struct scatterlist *prv, unsigned int prv_nents,
    > + struct scatterlist *sgl)
    > +{
    > +#ifndef ARCH_HAS_SG_CHAIN
    > + BUG();
    > +#endif

    Hmmm ... so we better also make sure all users call this from within
    an "#ifdef ARCH_HAS_SG_CHAIN" themselves (or else make this a config
    option defined in the arch/.../defconfig of archs that support this
    and then make the calling code's Kconfig option "depends on ... &&
    ARCH_FOO").

    (Just saw a previous thread, Andrew seems to have beaten me to this observation)
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