Well there is a clash of patchs and both are needed, and the have to be
mixed to gather properly.
On Thu, 25 Jul 2002, Charles R. Anderson wrote:
> [I'm not subscribed, so please Cc: me directly. Thanks.]
>
> patch-2.4.19-rc3-ac3 has this stuff related to highmem support:
>
> /*
> + * mapping stuff, prepare for highmem...
> + *
> + * temporarily mapping a (possible) highmem bio for PIO transfer
> + */
> +#define ide_rq_offset(rq) \
> + (((rq)->hard_cur_sectors - (rq)->current_nr_sectors) << 9)
> +
> +extern inline void *ide_map_buffer(struct request *rq, unsigned long
> *flags)
> +{
> + return rq->buffer + ide_rq_offset(rq);
> +}
> +
> +extern inline void ide_unmap_buffer(char *buffer, unsigned long *flags)
> +{
> + do { } while (0);
> +}
>
> Red Hat's 2.4.18-5 kernel has these conflicting bits in
> linux-2.4.17-blockhighmem.patch:
>
> +
> +/*
> + * temporarily mapping a (possible) highmem bio
> + */
> +#define ide_rq_offset(rq) (((rq)->hard_cur_sectors - (rq)->current_nr_sectors) << 9)
> +
> +extern inline void *ide_map_buffer(struct request *rq, unsigned long
> *flags)
> +{
> + return bh_kmap_irq(rq->bh, flags) + ide_rq_offset(rq);
> +}
> +
> +extern inline void ide_unmap_buffer(char *buffer, unsigned long *flags)
> +{
> + bh_kunmap_irq(buffer, flags);
> +}
>
> Which one should I apply? I'm inclined to keep the Red Hat bits, since
> the ac3 ide_unmap_buffer does nothing.
>
> [For anyone wondering, I have a new Dell with an Intel 845G chipset for
> which I would like DMA support, etc. I'm attempting to merge
> 2.4.19-rc3-ac3 with Red Hat's patches. If anyone has a simple patch for
> 82801DB IDE DMA support which applies to 2.4.18 I'd be much obliged.]
>
> Thanks.
>
> --
> Charles R. Anderson <cra@wpi.edu> / http://angus.ind.wpi.edu/~cra/
> PGP Key ID: 49BB5886
> Fingerprint: EBA3 A106 7C93 FA07 8E15 3AC2 C367 A0F9 49BB 5886
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Andre Hedrick
LAD Storage Consulting Group
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