Re: cache problem

[Rene B. <re...@we...>]

Alan Buxey wrote:

>> np =3D __get_free_pages(GFP_ATOMIC, 1);
>
>
> why the 1 instead of 0 ?


To get 2 pages. Sure, this is not realy necessary, but the allocated=20
size should not be cause of this cache problem.

>> cache_push((u_long)virt_to_phys(np), 8192);
>> cache_clear((u_long)virt_to_phys(np), 8192);
>> kernel_set_cachemode((np), 8192, IOMAP_NOCACHE_SER);
>
>
> how about a bzero(np,sizeof(*np));
>
> or, before the kernel_set_cachemode call, place
> cache_push() and cache_clear() commands?


I have allready tried this, no success. I also have played with some=20
other cache invalidation code. That all doesn`t help. Also I have=20
modified kernel_set_cachemode() (i.e manipulating TLB`s and=20
cache-flushing), no success.
By the way I think that kernel_set_cachemode() does not working right,=20
because the while() loop that set the cache modes for a page is only=20
called once, but I have allocated 2 pages. Maybe some other drivers have=20
trouble with that.

>
> good luck!


Thanks!


Ciao, Ren=E8