Re: [PATCH 2/2] New driver: Xillybus generic interface for FPGA (programmable logic)

[Arnd Bergmann]

On Friday 30 November 2012, Eli Billauer wrote:
> The problem is if the page size smaller than 4kB. The buffers 
> allocated by the driver must not cross a 4kB boundary, and it's assumed 
> that anything returned by __get_free_pages() is 4 kB-aligned. Otherwise 
> the FPGA will generate illegal PCIe packets by crossing that boundary.
> 
> If the page boundary is bigger than 4k, the driver handles that well.
> 

That should be fine then. We don't really support running Linux on
systems with a page size smaller than 4KB anyway, and I think the
only ones that ever hard smaller hardware page sizes (iirc m68k
or vax) were emulating 4KB pages in software.

	Arnd
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/