> I tried this. But, with some catch. ‘PAGE_KERNEL_NOCACHE’ seems to be the
> choice for majority of architectures like frv, m32r, sh, x86, etc, as Geert
> mentions below. However, i believe POWERPC defines it as ‘PAGE_KERNEL_NC‘
> found at arch/powerpc/include/asm/pte-common.h.
>
> Paul/Banjamin,
> Can you please confirm this ?
Read my reply to Greg. Why the heck are you trying to map memory
non-cacheable in the first place ?
Cheers
Ben.
> The below patch fixes the build error.
>
> Signed-off-by: Subrata Modak <subrata@xxxxxxxxxxxxxxxxxx>
> ---
>
> --- linux-2.6.30-rc8/drivers/staging/comedi/drivers.c.orig 2009-06-05 12:46:35.000000000 -0500
> +++ linux-2.6.30-rc8/drivers/staging/comedi/drivers.c 2009-06-05 13:03:31.000000000 -0500
> @@ -43,9 +43,13 @@
> #include <linux/vmalloc.h>
> #include <linux/cdev.h>
> #include <linux/dma-mapping.h>
> -
> #include <asm/io.h>
> #include <asm/system.h>
> +#ifdef __powerpc64__
> +#include <asm/pte-common.h>
> +#else
> +#include <asm/pgtable.h>
> +#endif
>
> static int postconfig(struct comedi_device *dev);
> static int insn_rw_emulate_bits(struct comedi_device *dev, struct comedi_subdevice *s,
> @@ -492,8 +496,13 @@ int comedi_buf_alloc(struct comedi_devic
> }
> if (i == n_pages) {
> async->prealloc_buf =
> +#ifdef __powerpc64__
> + vmap(pages, n_pages, VM_MAP,
> + PAGE_KERNEL_NC);
> +#else
> vmap(pages, n_pages, VM_MAP,
> PAGE_KERNEL_NOCACHE);
> +#endif
> }
> if (pages) {
> vfree(pages);
>
> ---
> Regards--
> Subrata
>
> > PAGE_KERNEL_NOCACHE is defined on a few architectures only, namely
> > frv, m32r, mn10300, sh, and x86[*]. On all others, it will fail.
> >
> > [*] Interestingly, sparc refers to it in one of its include files,
> > without providing a
> > definition, Probably that code is unused.
> >
> > Gr{oetje,eeting}s,
> >
> > Geert
> >
> > --
> > Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
> >
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